{"id":77459,"date":"2026-02-24T18:43:26","date_gmt":"2026-02-24T10:43:26","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/77459.html"},"modified":"2026-02-24T18:43:26","modified_gmt":"2026-02-24T10:43:26","slug":"15-java%e5%bc%82%e5%b8%b8%e5%a4%84%e7%90%86%e5%85%a8%e8%a7%a3%e6%9e%90%ef%bc%9a%e4%bb%8e%e5%ba%95%e5%b1%82%e5%8e%9f%e7%90%86%e5%88%b0%e5%ae%9e%e6%88%98%e9%81%bf%e5%9d%91%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/77459.html","title":{"rendered":"15. Java\u5f02\u5e38\u5904\u7406\u5168\u89e3\u6790\uff1a\u4ece\u5e95\u5c42\u539f\u7406\u5230\u5b9e\u6218\u907f\u5751\u6307\u5357"},"content":{"rendered":"

\u76ee\u5f55<\/p>\n

1. \u5f02\u5e38\u7684\u6982\u5ff5\u4e0e\u4f53\u7cfb\u7ed3\u6784<\/p>\n

1.1 \u5f02\u5e38\u7684\u6982\u5ff5<\/p>\n

1.1.1 \u7b97\u672f\u5f02\u5e38<\/p>\n

1.1.2\u00a0\u6570\u7ec4\u8d8a\u754c\u5f02\u5e38<\/p>\n

1.1.3 \u7a7a\u6307\u9488\u5f02\u5e38<\/p>\n

1.2 \u5f02\u5e38\u7684\u4f53\u7cfb\u7ed3\u6784<\/p>\n

1.3 \u5f02\u5e38\u7684\u5206\u7c7b<\/p>\n

1.3.1 \u7f16\u8bd1\u65f6\u5f02\u5e38<\/p>\n

1.3.1.1 \u4f8b\u5b501：<\/p>\n

1.3.1.2 \u4f8b\u5b502：<\/p>\n

1.3.2\u00a0\u8fd0\u884c\u65f6\u5f02\u5e38<\/p>\n

2. \u5f02\u5e38\u7684\u5904\u7406<\/p>\n

2.1 \u9632\u5fa1\u5f0f\u7f16\u7a0b<\/p>\n

2.1.1 LBYL: Look Before You Leap. \u5728\u64cd\u4f5c\u4e4b\u524d\u5c31\u505a\u5145\u5206\u7684\u68c0\u67e5\u3002\u5373：\u4e8b\u524d\u9632\u5fa1\u578b<\/p>\n

2.1.2 EAFP: It's Easier to Ask Forgiveness than Permission. "\u4e8b\u540e\u83b7\u53d6\u539f\u8c05\u6bd4\u4e8b\u524d\u83b7\u53d6\u8bb8\u53ef\u66f4\u5bb9\u6613". \u4e5f\u5c31\u662f\u5148\u64cd\u4f5c, \u9047\u5230\u95ee\u9898\u518d\u5904\u7406. \u5373: \u4e8b\u540e\u8ba4\u9519\u578b<\/p>\n

2.2 \u5f02\u5e38\u7684\u629b\u51fa-throw<\/p>\n

2.3 \u5f02\u5e38\u7684\u58f0\u660e-throws<\/p>\n

2.4 \u5f02\u5e38\u7684\u6355\u83b7-try-catch\u6355\u83b7\u5e76\u5904\u7406\u5f02\u5e38<\/p>\n

\u3010\u5173\u4e8e\u5f02\u5e38\u7684\u5904\u7406\u65b9\u5f0f\u30111\u30012\u30013<\/p>\n

\u3010\u6ce8\u610f\u4e8b\u9879\u30111\u30012\u30013\u30014\u30015<\/p>\n

2.5 finally<\/p>\n

2.6 \u5f02\u5e38\u7684\u5904\u7406\u6d41\u7a0b<\/p>\n

3. \u81ea\u5b9a\u4e49\u5f02\u5e38<\/p>\n

4. \u5c0f\u8bd5\u725b\u5200（9\u9053\u9898）<\/p>\n

\n

17.2025-03-24-\u5f02\u5e38 + 18.2025-03-26\u5f02\u5e38\u5b8c<\/span><\/p>\n

15. \u5f02\u5e38<\/p>\n

\u3010\u672c\u7ae0\u76ee\u6807\u3011<\/p>\n

  • \n

    \u5f02\u5e38\u6982\u5ff5\u4e0e\u4f53\u7cfb\u7ed3\u6784<\/p>\n<\/li>\n

  • \n

    \u5f02\u5e38\u7684\u5904\u7406\u65b9\u5f0f<\/p>\n<\/li>\n

  • \n

    \u5f02\u5e38\u7684\u5904\u7406\u6d41\u7a0b<\/p>\n<\/li>\n

  • \n

    \u81ea\u5b9a\u4e49\u5f02\u5e38\u7c7b<\/p>\n<\/li>\n

    1. \u5f02\u5e38\u7684\u6982\u5ff5\u4e0e\u4f53\u7cfb\u7ed3\u6784<\/h2>\n

    1.1 \u5f02\u5e38\u7684\u6982\u5ff5<\/h3>\n

    \u5f02\u5e38\u662f\u5728\u7a0b\u5e8f\u6267\u884c\u8fc7\u7a0b\u4e2d\u53d1\u751f\u7684\u4e00\u79cd\u7279\u6b8a\u60c5\u51b5\u6216\u9519\u8bef\u72b6\u6001\u3002\u5b83\u6253\u65ad\u4e86\u7a0b\u5e8f\u7684\u6b63\u5e38\u6d41\u7a0b，\u9700\u8981\u7279\u522b\u5904\u7406\u3002<\/p>\n

    \u5728\u65e5\u5e38\u5f00\u53d1\u4e2d，\u7a0b\u5e8f\u5458\u7ede\u5c3d\u8111\u6c41\u5c06\u4ee3\u7801\u5199\u7684\u5c3d\u5584\u5c3d\u7f8e，\u5728\u7a0b\u5e8f\u8fd0\u884c\u8fc7\u7a0b\u4e2d，\u96be\u514d\u4f1a\u51fa\u73b0\u4e00\u4e9b\u5947\u5947\u602a\u602a\u7684\u95ee\u9898\u3002\u6709\u65f6\u901a\u8fc7\u4ee3\u7801\u5f88\u96be\u53bb\u63a7\u5236，\u6bd4\u5982：\u6570\u636e\u683c\u5f0f\u4e0d\u5bf9\u3001\u7f51\u7edc\u4e0d\u901a\u7545\u3001\u5185\u5b58\u62a5\u8b66\u7b49\u3002<\/p>\n

    \u5728Java\u4e2d，\u5c06\u7a0b\u5e8f\u6267\u884c\u8fc7\u7a0b\u4e2d\u53d1\u751f\u7684\u4e0d\u6b63\u5e38\u884c\u4e3a\u79f0\u4e3a\u5f02\u5e38，\u6bd4\u5982\u4e4b\u524d\u5199\u4ee3\u7801\u65f6\u7ecf\u5e38\u9047\u5230\u7684：<\/p>\n

    1.1.1 \u7b97\u672f\u5f02\u5e38<\/h4>\n

    public static void main(String[] args) {
    \n System.out.println(10 \/ 0);
    \n}
    \nException in thread "main" java.lang.ArithmeticException: \/ by zero<\/p>\n

    at LibrarySystem.main(LibrarySystem.java:97) <\/p>\n

    1.1.2\u00a0\u6570\u7ec4\u8d8a\u754c\u5f02\u5e38<\/h4>\n

    public static void main(String[] args) {
    \n int[] array = {1, 2, 3};
    \n System.out.println(array[100]);
    \n}
    \nException in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 100 out of bounds for length 3<\/p>\n

    at LibrarySystem.main(LibrarySystem.java:98) <\/p>\n

    1.1.3 \u7a7a\u6307\u9488\u5f02\u5e38<\/h4>\n

    public static void main(String[] args) {
    \n int[] array = null;
    \n System.out.println(array.length);
    \n}
    \nException in thread "main" java.lang.NullPointerException: Cannot read the array length because "array" is null<\/p>\n

    at LibrarySystem.main(LibrarySystem.java:98) <\/p>\n

    \u4ece\u4e0a\u8ff0\u8fc7\u7a0b\u4e2d\u53ef\u4ee5\u770b\u5230，java\u4e2d\u4e0d\u540c\u7c7b\u578b\u7684\u5f02\u5e38，\u90fd\u6709\u4e0e\u5176\u5bf9\u5e94\u7684\u7c7b\u6765\u8fdb\u884c\u63cf\u8ff0\u3002<\/p>\n

    1.2 \u5f02\u5e38\u7684\u4f53\u7cfb\u7ed3\u6784<\/h3>\n

    \u5f02\u5e38\u79cd\u7c7b\u7e41\u591a，\u4e3a\u4e86\u5bf9\u4e0d\u540c\u5f02\u5e38\u6216\u8005\u9519\u8bef\u8fdb\u884c\u5f88\u597d\u7684\u5206\u7c7b\u7ba1\u7406，Java\u5185\u90e8\u7ef4\u62a4\u4e86\u4e00\u4e2a\u5f02\u5e38\u7684\u4f53\u7cfb\u7ed3\u6784：<\/p>\n

    \"\"<\/p>\n

    \u4ece\u4e0a\u56fe\u4e2d\u53ef\u4ee5\u770b\u5230：<\/p>\n

  • \n

    Throwable：\u662f\u5f02\u5e38\u4f53\u7cfb\u7684\u9876\u5c42\u7c7b，\u5176\u6d3e\u751f\u51fa\u4e24\u4e2a\u91cd\u8981\u7684\u5b50\u7c7b，Error \u548c Exception<\/p>\n<\/li>\n

  • \n

    Error：\u6307\u7684\u662fJava\u865a\u62df\u673a\u65e0\u6cd5\u89e3\u51b3\u7684\u4e25\u91cd\u95ee\u9898，\u6bd4\u5982：JVM\u7684\u5185\u90e8\u9519\u8bef\u3001\u8d44\u6e90\u8017\u5c3d\u7b49，\u5178\u578b\u4ee3\u8868：StackOverflowError\u548cOutOfMemoryError，\u4e00\u65e6\u53d1\u751f\u56de\u529b\u4e4f\u672f\u3002<\/p>\n<\/li>\n

  • \n

    Exception：\u5f02\u5e38\u4ea7\u751f\u540e\u7a0b\u5e8f\u5458\u53ef\u4ee5\u901a\u8fc7\u4ee3\u7801\u8fdb\u884c\u5904\u7406，\u4f7f\u7a0b\u5e8f\u7ee7\u7eed\u6267\u884c\u3002\u6bd4\u5982：\u611f\u5192\u3001\u53d1\u70e7\u3002\u6211\u4eec\u5e73\u65f6\u6240\u8bf4\u7684\u5f02\u5e38\u5c31\u662fException\u3002<\/p>\n<\/li>\n

    1.3 \u5f02\u5e38\u7684\u5206\u7c7b<\/h3>\n

    \"\"<\/p>\n

    \u5f02\u5e38\u53ef\u80fd\u5728\u7f16\u8bd1\u65f6\u53d1\u751f，\u4e5f\u53ef\u80fd\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u53d1\u751f，\u6839\u636e\u53d1\u751f\u7684\u65f6\u673a\u4e0d\u540c，\u53ef\u4ee5\u5c06\u5f02\u5e38\u5206\u4e3a：<\/p>\n

    1.3.1 \u7f16\u8bd1\u65f6\u5f02\u5e38<\/h4>\n

    1.3.1.1 \u4f8b\u5b501：<\/span><\/h4>\n

    \"\"<\/p>\n

    \u5904\u7406\u5f02\u5e38–throws：<\/span>\"\"<\/p>\n

    1.3.1.2 \u4f8b\u5b502：<\/span><\/h4>\n

    import java.io.FileInputStream;
    \nimport java.io.FileNotFoundException;<\/p>\n

    public class CheckedExceptionExample {
    \n public static void main(String[] args) {
    \n try {
    \n \/\/ \u5c1d\u8bd5\u6253\u5f00\u4e00\u4e2a\u53ef\u80fd\u4e0d\u5b58\u5728\u7684\u6587\u4ef6
    \n FileInputStream fis = new FileInputStream("hello.txt");
    \n System.out.println("\u6587\u4ef6\u6253\u5f00\u6210\u529f");
    \n } catch (FileNotFoundException e) {
    \n \/\/ \u6355\u83b7\u5e76\u5904\u7406\u6587\u4ef6\u672a\u627e\u5230\u5f02\u5e38
    \n System.out.println("\u9519\u8bef：\u6587\u4ef6\u4e0d\u5b58\u5728");
    \n e.printStackTrace();
    \n }
    \n }
    \n} <\/p>\n

    \u5728 Java \u4e2d，FileInputStream\u6784\u9020\u65b9\u6cd5\u5728\u7f16\u8bd1\u65f6\u4f1a\u5f3a\u5236\u68c0\u67e5 FileNotFoundException，\u8fd9\u5c5e\u4e8e\u53d7\u67e5\u5f02\u5e38（Checked Exception）\u3002\u7531\u4e8e\u53d7\u67e5\u5f02\u5e38\u5fc5\u987b\u5728\u7f16\u8bd1\u9636\u6bb5\u88ab\u663e\u5f0f\u5904\u7406，\u4ee3\u7801\u4e2d\u4f7f\u7528\u4e86 try-catch\u5757\u6765\u6355\u83b7\u8be5\u5f02\u5e38，\u786e\u4fdd\u5373\u4f7f\u6587\u4ef6\u4e0d\u5b58\u5728\u7a0b\u5e8f\u4e5f\u80fd\u7ed9\u51fa\u660e\u786e\u7684\u9519\u8bef\u63d0\u793a\u800c\u975e\u76f4\u63a5\u5d29\u6e83\u3002\u8fd9\u79cd\u673a\u5236\u8981\u6c42\u5f00\u53d1\u8005\u5fc5\u987b\u8003\u8651\u5e76\u5904\u7406\u6f5c\u5728\u7684\u9519\u8bef\u60c5\u51b5，\u4ece\u800c\u589e\u5f3a\u4ee3\u7801\u7684\u5065\u58ee\u6027\u3002<\/p>\n

    \u5728\u7a0b\u5e8f\u7f16\u8bd1\u671f\u95f4\u53d1\u751f\u7684\u5f02\u5e38，\u79f0\u4e3a\u7f16\u8bd1\u65f6\u5f02\u5e38，\u4e5f\u79f0\u4e3a\u53d7\u68c0\u67e5\u5f02\u5e38(Checked Exception)<\/p>\n

    public class Person {
    \n private String name;
    \n private String gender;
    \n int age;<\/p>\n

    \/\/ \u60f3\u8981\u8ba9\u8be5\u7c7b\u652f\u6301\u6df1\u62f7\u8d1d，\u8986\u5199Object\u7c7b\u7684clone\u65b9\u6cd5\u5373\u53ef<\/p>\n

    @Override
    \n public Person clone() {
    \n return (Person)super.clone();
    \n }
    \n} <\/p>\n

    \u7f16\u8bd1\u65f6\u62a5\u9519：<\/p>\n

    Error:(17, 35) java: \u672a\u62a5\u544a\u7684\u5f02\u5e38\u9519\u8befjava.lang.CloneNotSupportedException;<\/p>\n

    \u5fc5\u987b\u5bf9\u5176\u8fdb\u884c\u6355\u83b7\u6216\u58f0\u660e\u4ee5\u4fbf\u629b\u51fa<\/p>\n

    1.3.2\u00a0\u8fd0\u884c\u65f6\u5f02\u5e38<\/h4>\n

    \u5728\u7a0b\u5e8f\u6267\u884c\u671f\u95f4\u53d1\u751f\u7684\u5f02\u5e38，\u79f0\u4e3a\u8fd0\u884c\u65f6\u5f02\u5e38，\u4e5f\u79f0\u4e3a\u975e\u53d7\u68c0\u67e5\u5f02\u5e38(Unchecked Exception)<\/p>\n

    RuntimeException\u4ee5\u53ca\u5176\u5b50\u7c7b\u5bf9\u5e94\u7684\u5f02\u5e38，\u90fd\u79f0\u4e3a\u8fd0\u884c\u65f6\u5f02\u5e38\u3002<\/span>\u6bd4\u5982：NullPointerException\u3001ArrayIndexOutOfBoundsException\u3001ArithmeticException\u3002<\/p>\n

    NullPointerException：<\/p>\n

    int[] array = null;
    \nSystem.out.println(array.length);
    \n\/\/\u7f16\u8bd1\u65f6\u4e0d\u62a5\u9519，\u8fd0\u884c\u540e\u624d\u4f1a\u62a5\u9519 <\/p>\n

    \u6ce8\u610f：<\/span>\u7f16\u8bd1\u65f6\u51fa\u73b0\u7684\u8bed\u6cd5\u6027\u9519\u8bef，\u4e0d\u80fd\u79f0\u4e4b\u4e3a\u5f02\u5e38\u3002\u4f8b\u5982\u5c06 System.out.println \u62fc\u5199\u9519\u4e86，\u5199\u6210\u4e86 system.out.println\u3002\u6b64\u65f6\u7f16\u8bd1\u8fc7\u7a0b\u4e2d\u5c31\u4f1a\u51fa\u9519，\u8fd9\u662f\u201c\u7f16\u8bd1\u671f\u201d\u51fa\u9519\u3002\u800c\u8fd0\u884c\u65f6\u6307\u7684\u662f\u7a0b\u5e8f\u5df2\u7ecf\u7f16\u8bd1\u901a\u8fc7\u5f97\u5230 class \u6587\u4ef6\u4e86，\u518d\u7531 JVM \u6267\u884c\u8fc7\u7a0b\u4e2d\u51fa\u73b0\u7684\u9519\u8bef\u3002<\/p>\n

    \n

    2. \u5f02\u5e38\u7684\u5904\u7406<\/h2>\n

    2.1 \u9632\u5fa1\u5f0f\u7f16\u7a0b<\/h3>\n

    \u9519\u8bef\u5728\u4ee3\u7801\u4e2d\u662f\u5ba2\u89c2\u5b58\u5728\u7684\u3002\u56e0\u6b64\u6211\u4eec\u8981\u8ba9\u7a0b\u5e8f\u51fa\u73b0\u95ee\u9898\u7684\u65f6\u5019\u53ca\u65f6\u901a\u77e5\u7a0b\u5e8f\u5458\u3002\u4e3b\u8981\u7684\u65b9\u5f0f<\/p>\n

    2.1.1 LBYL: Look Before You Leap. \u5728\u64cd\u4f5c\u4e4b\u524d\u5c31\u505a\u5145\u5206\u7684\u68c0\u67e5\u3002\u5373：\u4e8b\u524d\u9632\u5fa1\u578b<\/h4>\n

    boolean ret = false;
    \nret = \u767b\u9646\u6e38\u620f();
    \nif (!ret) {
    \n \u5904\u7406\u767b\u9646\u6e38\u620f\u9519\u8bef;
    \n return;
    \n}
    \nret = \u5f00\u59cb\u5339\u914d();
    \nif (!ret) {
    \n \u5904\u7406\u5339\u914d\u9519\u8bef;
    \n return;
    \n}
    \nret = \u6e38\u620f\u786e\u8ba4();
    \nif (!ret) {
    \n \u5904\u7406\u6e38\u620f\u786e\u8ba4\u9519\u8bef;
    \n return;
    \n}
    \nret = \u9009\u62e9\u82f1\u96c4();
    \nif (!ret) {
    \n \u5904\u7406\u9009\u62e9\u82f1\u96c4\u9519\u8bef;
    \n return;
    \n}
    \nret = \u8f7d\u5165\u6e38\u620f\u753b\u9762();
    \nif (!ret) {
    \n \u5904\u7406\u8f7d\u5165\u6e38\u620f\u9519\u8bef;
    \n return;
    \n}
    \n…… <\/p>\n

    \u7f3a\u9677：\u6b63\u5e38\u6d41\u7a0b\u548c\u9519\u8bef\u5904\u7406\u6d41\u7a0b\u4ee3\u7801\u6df7\u5728\u4e00\u8d77，\u4ee3\u7801\u6574\u4f53\u663e\u7684\u6bd4\u8f83\u6df7\u4e71\u3002<\/p>\n

    2.1.2 EAFP: It's Easier to Ask Forgiveness than Permission. "\u4e8b\u540e\u83b7\u53d6\u539f\u8c05\u6bd4\u4e8b\u524d\u83b7\u53d6\u8bb8\u53ef\u66f4\u5bb9\u6613". \u4e5f\u5c31\u662f\u5148\u64cd\u4f5c, \u9047\u5230\u95ee\u9898\u518d\u5904\u7406. \u5373: \u4e8b\u540e\u8ba4\u9519\u578b<\/h4>\n

    try {
    \n \u767b\u9646\u6e38\u620f();
    \n \u5f00\u59cb\u5339\u914d();
    \n \u6e38\u620f\u786e\u8ba4();
    \n \u9009\u62e9\u82f1\u96c4();
    \n \u8f7d\u5165\u6e38\u620f\u753b\u9762();
    \n …
    \n} catch (\u767b\u9646\u6e38\u620f\u5f02\u5e38) {
    \n \u5904\u7406\u767b\u9646\u6e38\u620f\u5f02\u5e38;
    \n} catch (\u5f00\u59cb\u5339\u914d\u5f02\u5e38) {
    \n \u5904\u7406\u5f00\u59cb\u5339\u914d\u5f02\u5e38;
    \n} catch (\u6e38\u620f\u786e\u8ba4\u5f02\u5e38) {
    \n \u5904\u7406\u6e38\u620f\u786e\u8ba4\u5f02\u5e38;
    \n …
    \n} catch (\u9009\u62e9\u82f1\u96c4\u5f02\u5e38) {
    \n \u5904\u7406\u9009\u62e9\u82f1\u96c4\u5f02\u5e38;
    \n} catch (\u8f7d\u5165\u6e38\u620f\u753b\u9762\u5f02\u5e38) {
    \n \u5904\u7406\u8f7d\u5165\u6e38\u620f\u5f02\u5e38;
    \n ……
    \n} <\/p>\n

    \u4f18\u52bf：\u6b63\u5e38\u6d41\u7a0b\u548c\u9519\u8bef\u6d41\u7a0b\u662f\u5206\u79bb\u5f00\u7684, \u7a0b\u5e8f\u5458\u66f4\u5173\u6ce8\u6b63\u5e38\u6d41\u7a0b, \u4ee3\u7801\u66f4\u6e05\u6670, \u5bb9\u6613\u7406\u89e3\u4ee3\u7801<\/p>\n

    \u5f02\u5e38\u5904\u7406\u7684\u6838\u5fc3\u601d\u60f3\u5c31\u662f EAFP\u3002<\/p>\n

    \u5728Java\u4e2d, \u5f02\u5e38\u5904\u7406\u4e3b\u8981\u76845\u4e2a\u5173\u952e\u5b57: throw\u3001try\u3001catch\u3001finally\u3001throws\u3002<\/span><\/p>\n

    2.2 \u5f02\u5e38\u7684\u629b\u51fa-throw<\/h3>\n

    \u5728\u7f16\u5199\u7a0b\u5e8f\u65f6，\u5982\u679c\u7a0b\u5e8f\u4e2d\u51fa\u73b0\u9519\u8bef，\u6b64\u65f6\u5c31\u9700\u8981\u5c06\u9519\u8bef\u7684\u4fe1\u606f\u544a\u77e5\u7ed9\u8c03\u7528\u8005，\u6bd4\u5982：\u53c2\u6570\u68c0\u6d4b\u3002<\/p>\n

    \u5728Java\u4e2d，\u53ef\u4ee5\u501f\u52a9throw\u5173\u952e\u5b57，\u629b\u51fa\u4e00\u4e2a\u6307\u5b9a\u7684\u5f02\u5e38\u5bf9\u8c61，\u5c06\u9519\u8bef\u4fe1\u606f\u544a\u77e5\u7ed9\u8c03\u7528\u8005\u3002\u5177\u4f53\u8bed\u6cd5\u5982\u4e0b：<\/p>\n

    throw new XXXException("\u5f02\u5e38\u4ea7\u751f\u7684\u539f\u56e0"); <\/p>\n

    \u3010\u9700\u6c42\u3011：\u5b9e\u73b0\u4e00\u4e2a\u83b7\u53d6\u6570\u7ec4\u4e2d\u4efb\u610f\u4f4d\u7f6e\u5143\u7d20\u7684\u65b9\u6cd5\u3002<\/p>\n

    public static int getElement(int[] array, int index){
    \n if(null == array){
    \n throw new NullPointerException("\u4f20\u9012\u7684\u6570\u7ec4\u4e3anull");
    \n }<\/p>\n

    if(index < 0 || index >= array.length){
    \n throw new ArrayIndexOutOfBoundsException("\u4f20\u9012\u7684\u6570\u7ec4\u4e0b\u6807\u8d8a\u754c");
    \n }<\/p>\n

    return array[index];
    \n}<\/p>\n

    public static void main(String[] args) {
    \n int[] array = {1,2,3};
    \n getElement(array, 3);
    \n} <\/p>\n

    \u3010\u6ce8\u610f\u4e8b\u9879\u3011<\/p>\n

  • \n

    throw\u5fc5\u987b\u5199\u5728\u65b9\u6cd5\u4f53\u5185\u90e8<\/p>\n<\/li>\n

  • \n

    \u629b\u51fa\u7684\u5bf9\u8c61\u5fc5\u987b（\u5728\u5f02\u5e38\u7684\u8303\u7574\u91cc\u9762）\u662fException \u6216\u8005 Exception \u7684\u5b50\u7c7b\u5bf9\u8c61<\/p>\n<\/li>\n

  • \n

    \u5982\u679c\u629b\u51fa\u7684\u662f RunTimeException \u6216\u8005 RunTimeException \u7684\u5b50\u7c7b，\u5219\u53ef\u4ee5\u4e0d\u7528\u5904\u7406，\u76f4\u63a5\u4ea4\u7ed9 JVM\u6765\u5904\u7406<\/p>\n<\/li>\n

  • \n

    \u5982\u679c\u629b\u51fa\u7684\u662f\u7f16\u8bd1\u65f6\u5f02\u5e38，\u7528\u6237\u5fc5\u987b\u5904\u7406，\u5426\u5219\u65e0\u6cd5\u901a\u8fc7\u7f16\u8bd1<\/p>\n<\/li>\n

  • \n

    \u5f02\u5e38\u4e00\u65e6\u629b\u51fa，\u5176\u540e\u7684\u4ee3\u7801\u5c31\u4e0d\u4f1a\u6267\u884c<\/span><\/p>\n<\/li>\n

    2.3 \u5f02\u5e38\u7684\u58f0\u660e-throws<\/h3>\n

    throws \u5173\u952e\u5b57\u7528\u4e8e\u5728\u65b9\u6cd5\u58f0\u660e\u4e2d\u5217\u51fa\u8be5\u65b9\u6cd5\u53ef\u80fd\u629b\u51fa\u7684\u5f02\u5e38，\u5b83\u544a\u8bc9\u8c03\u7528\u8005\u8fd9\u4e2a\u65b9\u6cd5\u53ef\u80fd\u4f1a\u629b\u51fa\u67d0\u4e9b\u5f02\u5e38，\u8c03\u7528\u8005\u9700\u8981\u5904\u7406\u8fd9\u4e9b\u5f02\u5e38\u3002\u4f7f\u7528 throws \u5b9e\u9645\u4e0a\u662f\u5c06\u5f02\u5e38\u7684\u5904\u7406\u8d23\u4efb\u8f6c\u79fb\u7ed9\u4e86\u8c03\u7528\u8be5\u65b9\u6cd5\u7684\u4ee3\u7801\u3002<\/p>\n

    \u8bed\u6cd5\u683c\u5f0f：<\/p>\n

    \u4fee\u9970\u7b26 \u8fd4\u56de\u503c\u7c7b\u578b \u65b9\u6cd5\u540d(\u53c2\u6570\u5217\u8868) throws<\/span> \u5f02\u5e38\u7c7b\u578b1, \u5f02\u5e38\u7c7b\u578b2…{<\/p>\n

    }<\/p>\n

    \u9700\u6c42：\u52a0\u8f7d\u6307\u5b9a\u7684\u914d\u7f6e\u6587\u4ef6config.ini<\/p>\n

    public class Config {
    \n File file;<\/p>\n

    \/*
    \n FileNotFoundException : \u7f16\u8bd1\u65f6\u5f02\u5e38，\u8868\u660e\u6587\u4ef6\u4e0d\u5b58\u5728
    \n \u6b64\u5904\u4e0d\u5904\u7406，\u4e5f\u6ca1\u6709\u80fd\u529b\u5904\u7406，\u5e94\u8be5\u5c06\u9519\u8bef\u4fe1\u606f\u62a5\u544a\u7ed9\u8c03\u7528\u8005，\u8ba9\u8c03\u7528\u8005\u68c0\u67e5\u6587\u4ef6\u540d\u5b57\u662f\u5426\u7ed9\u9519\u4e86
    \n *\/<\/p>\n

    public void OpenConfig(String filename) throws FileNotFoundException{
    \n if(filename.equals("config.ini")){
    \n throw new FileNotFoundException("\u914d\u7f6e\u6587\u4ef6\u540d\u5b57\u4e0d\u5bf9");
    \n }<\/p>\n

    \/\/ \u6253\u5f00\u6587\u4ef6
    \n }<\/p>\n

    public void readConfig(){
    \n }
    \n} <\/p>\n

    \u3010\u6ce8\u610f\u4e8b\u9879\u3011<\/p>\n

  • \n

    throws\u5fc5\u987b\u8ddf\u5728\u65b9\u6cd5\u7684\u53c2\u6570\u5217\u8868\u4e4b\u540e<\/p>\n<\/li>\n

  • \n

    \u58f0\u660e\u7684\u5f02\u5e38\u5fc5\u987b（\u5728\u5f02\u5e38\u7684\u8303\u7574\u91cc\u9762）\u662f Exception \u6216\u8005 Exception \u7684\u5b50\u7c7b<\/p>\n<\/li>\n

  • \n

    \u65b9\u6cd5\u5185\u90e8\u5982\u679c\u629b\u51fa\u4e86\u591a\u4e2a\u5f02\u5e38，throws\u4e4b\u540e\u5fc5\u987b\u8ddf\u591a\u4e2a\u5f02\u5e38\u7c7b\u578b，\u4e4b\u95f4\u7528\u9017\u53f7\u9694\u5f00，\u5982\u679c\u629b\u51fa\u591a\u4e2a\u5f02\u5e38\u7c7b\u578b\u5177\u6709\u7236\u5b50\u5173\u7cfb，\u76f4\u63a5\u58f0\u660e\u7236\u7c7b\u5373\u53ef\u3002<\/p>\n<\/li>\n

    public class Config {
    \n File file;<\/p>\n

    \/\/ FileNotFoundException \u7ee7\u627f\u81ea IOException
    \n public void OpenConfig(String filename) throws IOException{
    \n if(!filename.endsWith(".ini")){
    \n throw new IOException("\u6587\u4ef6\u4e0d\u662f.ini\u6587\u4ef6");
    \n }<\/p>\n

    if(!filename.equals("config.ini")){
    \n throw new FileNotFoundException("\u914d\u7f6e\u6587\u4ef6\u540d\u5b57\u4e0d\u5bf9");
    \n }<\/p>\n

    \/\/ \u6253\u5f00\u6587\u4ef6
    \n }<\/p>\n

    public void readConfig(){
    \n }
    \n} <\/p>\n

    4. \u8c03\u7528\u58f0\u660e\u629b\u51fa\u5f02\u5e38\u7684\u65b9\u6cd5\u65f6，\u5982\u679c\u8be5\u5f02\u5e38\u662f\u7f16\u8bd1\u65f6\u5f02\u5e38\/\u53d7\u67e5\u5f02\u5e38\u65f6，\u8c03\u7528\u8005\u5fc5\u987b\u5bf9\u8be5\u5f02\u5e38\u8fdb\u884c\u5904\u7406，\u6216\u8005\u7ee7\u7eed\u4f7f\u7528throws\u629b\u51fa<\/p>\n

    public static void main(String[] args) throws IOException {
    \n Config config = new Config();
    \n config.openConfig("config.ini");
    \n} <\/p>\n

    \u5c06\u5149\u6807\u653e\u5728\u629b\u51fa\u5f02\u5e38\u65b9\u6cd5\u4e0a，alt + Insert \u5feb\u901f \u5904\u7406：<\/p>\n

    \"\"<\/p>\n

    2.4 \u5f02\u5e38\u7684\u6355\u83b7-try-catch\u6355\u83b7\u5e76\u5904\u7406\u5f02\u5e38<\/h3>\n

    throws\u5bf9\u5f02\u5e38\u5e76\u6ca1\u6709\u771f\u6b63\u5904\u7406，\u800c\u662f\u5c06\u5f02\u5e38\u62a5\u544a\u7ed9\u629b\u51fa\u5f02\u5e38\u65b9\u6cd5\u7684\u8c03\u7528\u8005，\u7531\u8c03\u7528\u8005\u5904\u7406\u3002\u5982\u679c\u771f\u6b63\u8981\u5bf9\u5f02\u5e38\u8fdb\u884c\u5904\u7406，\u5c31\u9700\u8981try-catch\u3002<\/p>\n

    \u8bed\u6cd5\u683c\u5f0f：<\/p>\n

    try{
    \n \/\/ \u5c06\u53ef\u80fd\u51fa\u73b0\u5f02\u5e38\u7684\u4ee3\u7801\u653e\u5728\u8fd9\u91cc
    \n}catch(\u8981\u6355\u83b7\u7684\u5f02\u5e38\u7c7b\u578b e){
    \n \/\/ \u5982\u679ctry\u4e2d\u7684\u4ee3\u7801\u629b\u51fa\u5f02\u5e38\u4e86，\u6b64\u5904catch\u6355\u83b7\u65f6\u5f02\u5e38\u7c7b\u578b\u4e0etry\u4e2d\u629b\u51fa\u7684\u5f02\u5e38\u7c7b\u578b\u4e00\u81f4
    \n \/\/ \u65f6，\u6216\u8005\u662ftry\u4e2d\u629b\u51fa\u5f02\u5e38\u7684\u57fa\u7c7b\u65f6，\u5c31\u4f1a\u88ab\u6355\u83b7\u5230
    \n \/\/ \u5bf9\u5f02\u5e38\u5c31\u53ef\u4ee5\u6b63\u5e38\u5904\u7406，\u5904\u7406\u5b8c\u6210\u540e，\u8df3\u51fatry-catch\u7ed3\u6784，\u7ee7\u7eed\u6267\u884c\u540e\u7eed\u4ee3\u7801
    \n}catch(\u5f02\u5e38\u7c7b\u578b e){
    \n \/\/ \u5bf9\u5f02\u5e38\u8fdb\u884c\u5904\u7406
    \n}finally{
    \n \/\/ \u6b64\u5904\u4ee3\u7801\u4e00\u5b9a\u4f1a\u88ab\u6267\u884c\u5230
    \n}<\/p>\n

    \/\/ \u540e\u5e8f\u4ee3\u7801
    \n\/\/ \u5f53\u5f02\u5e38\u88ab\u6355\u83b7\u5230\u65f6，\u5f02\u5e38\u5c31\u88ab\u5904\u7406\u4e86，\u8fd9\u91cc\u7684\u540e\u5e8f\u4ee3\u7801\u4e00\u5b9a\u4f1a\u6267\u884c
    \n\/\/ \u5982\u679c\u6355\u83b7\u4e86，\u7531\u4e8e\u6355\u83b7\u5230\u7c7b\u578b\u4e0d\u5bf9，\u90a3\u5c31\u6ca1\u6709\u6355\u83b7\u5230，\u8fd9\u91cc\u7684\u4ee3\u7801\u5c31\u4e0d\u4f1a\u88ab\u6267\u884c <\/p>\n

    \u6ce8\u610f：<\/p>\n

  • \n

    []\u4e2d\u8868\u793a\u53ef\u9009\u9879，\u53ef\u4ee5\u6dfb\u52a0，\u4e5f\u53ef\u4ee5\u4e0d\u7528\u6dfb\u52a0<\/p>\n<\/li>\n

  • \n

    try\u4e2d\u7684\u4ee3\u7801\u53ef\u80fd\u4f1a\u629b\u51fa\u5f02\u5e38，\u4e5f\u53ef\u80fd\u4e0d\u4f1a<\/p>\n<\/li>\n

    \u9700\u6c42：\u8bfb\u53d6\u914d\u7f6e\u6587\u4ef6，\u5982\u679c\u914d\u7f6e\u6587\u4ef6\u540d\u5b57\u4e0d\u662f\u6307\u5b9a\u540d\u5b57，\u629b\u51fa\u5f02\u5e38，\u8c03\u7528\u8005\u8fdb\u884c\u5f02\u5e38\u5904\u7406<\/p>\n

    public class Config {
    \n File file;<\/p>\n

    public void openConfig(String filename) throws FileNotFoundException{
    \n if(!filename.equals("config.ini")){
    \n throw new FileNotFoundException("\u914d\u7f6e\u6587\u4ef6\u540d\u5b57\u4e0d\u5bf9");
    \n }<\/p>\n

    \/\/ \u6253\u5f00\u6587\u4ef6
    \n }<\/p>\n

    public void readConfig(){
    \n }
    \n}<\/p>\n

    public static void main(String[] args) {
    \n Config config = new Config();
    \n try {
    \n config.openConfig("config.txt");
    \n System.out.println("\u6587\u4ef6\u6253\u5f00\u6210\u529f");
    \n } catch (IOException e) {
    \n \/\/ \u5f02\u5e38\u7684\u5904\u7406\u65b9\u5f0f
    \n \/\/System.out.println(e.getMessage());
    \n \/\/System.out.println(e);
    \n e.printStackTrace();
    \n }<\/p>\n

    \/\/ \u4e00\u65e6\u5f02\u5e38\u88ab\u6355\u83b7\u5904\u7406\u4e86，\u6b64\u5904\u7684\u4ee3\u7801\u4f1a\u6267\u884c
    \n System.out.println("\u5f02\u5e38\u5982\u679c\u88ab\u5904\u7406\u4e86，\u8fd9\u91cc\u7684\u4ee3\u7801\u4e5f\u53ef\u4ee5\u6267\u884c");
    \n} <\/p>\n

    \u3010\u5173\u4e8e\u5f02\u5e38\u7684\u5904\u7406\u65b9\u5f0f\u30111\u30012\u30013<\/span><\/h4>\n

    \u5f02\u5e38\u7684\u79cd\u7c7b\u6709\u5f88\u591a，\u6211\u4eec\u8981\u6839\u636e\u4e0d\u540c\u7684\u4e1a\u52a1\u573a\u666f\u6765\u51b3\u5b9a\u3002<\/p>\n

  • \n

    \u5bf9\u4e8e\u6bd4\u8f83\u4e25\u91cd\u7684\u95ee\u9898（\u4f8b\u5982\u548c\u7b97\u94b1\u76f8\u5173\u7684\u573a\u666f），\u5e94\u8be5\u8ba9\u7a0b\u5e8f\u76f4\u63a5\u5d29\u6e83，\u9632\u6b62\u9020\u6210\u66f4\u4e25\u91cd\u7684\u540e\u679c<\/p>\n<\/li>\n

  • \n

    \u5bf9\u4e8e\u4e0d\u592a\u4e25\u91cd\u7684\u95ee\u9898（\u5927\u591a\u6570\u573a\u666f），\u53ef\u4ee5\u8bb0\u5f55\u9519\u8bef\u65e5\u5fd7，\u5e76\u901a\u8fc7\u76d1\u63a7\u62a5\u8b66\u7a0b\u5e8f\u53ca\u65f6\u901a\u77e5\u7a0b\u5e8f\u733f<\/p>\n<\/li>\n

  • \n

    \u5bf9\u4e8e\u53ef\u80fd\u4f1a\u6062\u590d\u7684\u95ee\u9898（\u548c\u7f51\u7edc\u76f8\u5173\u7684\u573a\u666f），\u53ef\u4ee5\u5c1d\u8bd5\u8fdb\u884c\u91cd\u8bd5\u3002<\/p>\n<\/li>\n

    \u5728\u6211\u4eec\u5f53\u524d\u7684\u4ee3\u7801\u4e2d\u91c7\u53d6\u7684\u662f\u7ecf\u8fc7\u7b80\u5316\u7684\u7b2c\u4e8c\u79cd\u65b9\u5f0f\u3002\u6211\u4eec\u8bb0\u5f55\u7684\u9519\u8bef\u65e5\u5fd7\u662f\u51fa\u73b0\u5f02\u5e38\u7684\u65b9\u6cd5\u8c03\u7528\u4fe1\u606f，\u80fd\u5f88\u5feb\u901f\u7684\u8ba9\u6211\u4eec\u627e\u5230\u51fa\u73b0\u5f02\u5e38\u7684\u4f4d\u7f6e\u3002\u4ee5\u540e\u5728\u5b9e\u9645\u5de5\u4f5c\u4e2d\u6211\u4eec\u4f1a\u91c7\u53d6\u66f4\u5b8c\u5907\u7684\u65b9\u5f0f\u6765\u8bb0\u5f55\u5f02\u5e38\u4fe1\u606f\u3002<\/p>\n

    \u3010\u6ce8\u610f\u4e8b\u9879\u30111\u30012\u30013\u30014\u30015<\/span><\/h4>\n

    1. try\u5757\u5185\u629b\u51fa\u5f02\u5e38\u4f4d\u7f6e\u4e4b\u540e\u7684\u4ee3\u7801\u5c06\u4e0d\u4f1a\u88ab\u6267\u884c<\/p>\n

    2. \u5982\u679c\u629b\u51fa\u5f02\u5e38\u7c7b\u578b\u4e0ecatch\u4e2d\u5f02\u5e38\u7c7b\u578b\u4e0d\u5339\u914d，\u5373\u5f02\u5e38\u4e0d\u4f1a\u88ab\u6210\u529f\u6355\u83b7，\u4e5f\u5c31\u4e0d\u4f1a\u88ab\u5904\u7406，\u7ee7\u7eed\u5f80\u5916\u629b，\u76f4\u5230JVM\u6536\u5230\u540e\u4e2d\u65ad\u7a0b\u5e8f—-\u5f02\u5e38\u662f\u6309\u7167\u7c7b\u578b\u6765\u6355\u83b7\u7684<\/p>\n

    public class Test2 {<\/p>\n

    public static void func2(int a) throws ArithmeticException{
    \n if(a == 0) {
    \n22 throw new ArithmeticException();
    \n }
    \n System.out.println(10\/a);
    \n }<\/p>\n

    public static void main(String[] args) {
    \n try {
    \n func2(a: 0); \/\/ \u53ef\u80fd\u53d1\u751f\u5f02\u5e38\u7684\u4ee3\u7801
    \n }catch (ArithmeticException e) { \/\/ \u6355\u83b7\u7684 try\u5f53\u4e2d \u53ef\u80fd\u53d1\u751f\u7684\u5f02\u5e38
    \n e.printStackTrace();
    \n System.out.println("\u6355\u6349\u5230\u4e86\u7b97\u672f\u5f02\u5e38，\u903b\u8f91 . . . .");
    \n }<\/p>\n

    System.out.println("haha!");
    \n }
    \n} <\/p>\n

    \"\"<\/p>\n

    public static void main(String[] args) {
    \n try {
    \n int[] array = {1, 2, 3};
    \n System.out.println(array[3]); \/\/ \u6b64\u5904\u4f1a\u629b\u51fa\u6570\u7ec4\u8d8a\u754c\u5f02\u5e38
    \n } catch (NullPointerException e) { \/\/ \u6355\u83b7\u65f6\u5019\u6355\u83b7\u7684\u662f\u7a7a\u6307\u9488\u5f02\u5e38–\u771f\u6b63\u7684\u5f02\u5e38\u65e0\u6cd5\u88ab\u6355\u83b7\u5230
    \n e.printStackTrace();
    \n }<\/p>\n

    System.out.println("\u540e\u7eed\u4ee3\u7801");
    \n}
    \nException in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3<\/p>\n

    at day20210917.ArrayOperator.main(ArrayOperator.java:24) <\/p>\n

    3. try\u4e2d\u53ef\u80fd\u4f1a\u629b\u51fa\u591a\u4e2a\u4e0d\u540c\u7684\u5f02\u5e38\u5bf9\u8c61，\u5219\u5fc5\u987b\u7528\u591a\u4e2acatch\u6765\u6355\u83b7—-\u5373\u591a\u79cd\u5f02\u5e38，\u591a\u6b21\u6355\u83b7<\/p>\n

    public static void main(String[] args) {
    \n int[] array = {1, 2, 3};<\/p>\n

    try {
    \n System.out.println("before");
    \n \/\/ array = null;
    \n System.out.println(array[100]);
    \n System.out.println("after");
    \n } catch (ArrayIndexOutOfBoundsException e) {
    \n System.out.println("\u8fd9\u662f\u4e2a\u6570\u7ec4\u4e0b\u6807\u8d8a\u754c\u5f02\u5e38");
    \n e.printStackTrace();
    \n } catch (NullPointerException e) {
    \n System.out.println("\u8fd9\u662f\u4e2a\u7a7a\u6307\u9488\u5f02\u5e38");
    \n e.printStackTrace();
    \n }
    \n System.out.println("after try catch");
    \n} <\/p>\n

    \u5982\u679c\u591a\u4e2a\u5f02\u5e38\u7684\u5904\u7406\u65b9\u5f0f\u662f\u5b8c\u5168\u76f8\u540c，\u4e5f\u53ef\u4ee5\u5199\u6210\u8fd9\u6837（\u8bed\u6cd5\u652f\u6301\u4f46\u4e0d\u5efa\u8bae）：<\/p>\n

    catch (ArrayIndexOutOfBoundsException | NullPointerException e) {
    \n …
    \n} <\/p>\n

    \u5982\u679c\u5f02\u5e38\u4e4b\u95f4\u5177\u6709\u7236\u5b50\u5173\u7cfb，\u4e00\u5b9a\u662f\u5b50\u7c7b\u5f02\u5e38\u5728\u524dcatch，\u7236\u7c7b\u5f02\u5e38\u5728\u540ecatch，\u5426\u5219\u8bed\u6cd5\u9519\u8bef：<\/p>\n

    public static void main(String[] args) {
    \n int[] arr = {1, 2, 3};
    \n try {
    \n System.out.println("before");
    \n arr = null;
    \n System.out.println(arr[100]);
    \n System.out.println("after");
    \n } catch (Exception e) { \/\/ Exception\u53ef\u4ee5\u6355\u83b7\u5230\u6240\u6709\u5f02\u5e38
    \n e.printStackTrace();
    \n } catch (NullPointerException e) { \/\/ \u6c38\u8fdc\u90fd\u6355\u83b7\u6267\u884c\u5230
    \n e.printStackTrace();
    \n }<\/p>\n

    System.out.println("after try catch");
    \n}
    \nError:(33, 10) java: \u5df2\u6355\u83b7\u5230\u5f02\u5e38\u9519\u8befjava.lang.NullPointerException <\/p>\n

    4. \u53ef\u4ee5\u901a\u8fc7\u4e00\u4e2acatch\u6355\u83b7\u6240\u6709\u7684\u5f02\u5e38，\u5373\u591a\u4e2a\u5f02\u5e38，\u4e00\u6b21\u6355\u83b7(\u4e0d\u63a8\u8350)<\/p>\n

    public static void main(String[] args) {
    \n int[] arr = {1, 2, 3};
    \n try {
    \n System.out.println("before");
    \n arr = null;
    \n System.out.println(arr[100]);
    \n System.out.println("after");
    \n } catch (Exception e) {
    \n e.printStackTrace();
    \n }
    \n System.out.println("after try catch");
    \n} <\/p>\n

    \u7531\u4e8e Exception \u7c7b\u662f\u6240\u6709\u5f02\u5e38\u7c7b\u7684\u7236\u7c7b，\u56e0\u6b64\u53ef\u4ee5\u7528\u8fd9\u4e2a\u7c7b\u578b\u8868\u793a\u6355\u6349\u6240\u6709\u5f02\u5e38\u3002<\/p>\n

    \u5907\u6ce8：catch \u8fdb\u884c\u7c7b\u578b\u5339\u914d\u7684\u65f6\u5019，\u4e0d\u5149\u4f1a\u5339\u914d\u76f8\u540c\u7c7b\u578b\u7684\u5f02\u5e38\u5bf9\u8c61，\u4e5f\u4f1a\u6355\u6349\u76ee\u6807\u5f02\u5e38\u7c7b\u578b\u7684\u5b50\u7c7b\u5bf9\u8c61\u3002<\/p>\n

    \u5982\u521a\u624d\u7684\u4ee3\u7801，NullPointerException \u548c ArrayIndexOutOfBoundsException \u90fd\u662f Exception \u7684\u5b50\u7c7b，\u56e0\u6b64\u90fd\u80fd\u88ab\u6355\u83b7\u5230\u3002<\/p>\n

    5. \u7236\u7c7b\u5f02\u5e38（\u5bb6\u957f）\u4f5c\u4e3a\u540e\u76fe–\u653e\u5728\u540e\u9762<\/p>\n

    public class Test3 {<\/p>\n

    public static void main(String[] args) {
    \n int[] array = {1, 2, 3};<\/p>\n

    try {
    \n System.out.println("before");
    \n array = null;
    \n \/\/System.out.println(array.length);
    \n System.out.println(array[100]);
    \n System.out.println("after");
    \n } catch (ArrayIndexOutOfBoundsException e) {
    \n System.out.println("\u8fd9\u662f\u4e2a\u6570\u7ec4\u4e0b\u6807\u8d8a\u754c\u5f02\u5e38");
    \n e.printStackTrace();
    \n } catch (NullPointerException e) {
    \n System.out.println("\u8fd9\u662f\u4e2a\u7a7a\u6307\u9488\u5f02\u5e38");
    \n e.printStackTrace();
    \n } catch (RuntimeException e) {
    \n e.printStackTrace();
    \n }
    \n System.out.println("after try catch");
    \n }
    \n} <\/p>\n

    2.5 finally<\/h3>\n

    \u5728\u5199\u7a0b\u5e8f\u65f6，\u6709\u4e9b\u7279\u5b9a\u7684\u4ee3\u7801，\u4e0d\u8bba\u7a0b\u5e8f\u662f\u5426\u53d1\u751f\u5f02\u5e38，\u90fd\u9700\u8981\u6267\u884c，\u6bd4\u5982\u7a0b\u5e8f\u4e2d\u6253\u5f00\u7684\u8d44\u6e90：\u7f51\u7edc\u8fde\u63a5\u3001\u6570\u636e\u5e93\u8fde\u63a5\u3001IO\u6d41\u7b49，\u5728\u7a0b\u5e8f\u6b63\u5e38\u6216\u8005\u5f02\u5e38\u9000\u51fa\u65f6，\u5fc5\u987b\u8981\u5bf9\u8d44\u6e90\u8fdb\u884c\u56de\u6536\u3002\u53e6\u5916，\u56e0\u4e3a\u5f02\u5e38\u4f1a\u5f15\u53d1\u7a0b\u5e8f\u7684\u8df3\u8f6c，\u53ef\u80fd\u5bfc\u81f4\u6709\u4e9b\u8bed\u53e5\u6267\u884c\u4e0d\u5230，finally\u5c31\u662f\u7528\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u3002<\/p>\n

    \u8bed\u6cd5\u683c\u5f0f：<\/p>\n

    try{
    \n \/\/ \u53ef\u80fd\u4f1a\u53d1\u751f\u5f02\u5e38\u7684\u4ee3\u7801
    \n}catch(\u5f02\u5e38\u7c7b\u578b e){
    \n \/\/ \u5bf9\u6355\u83b7\u5230\u7684\u5f02\u5e38\u8fdb\u884c\u5904\u7406
    \n}finally{
    \n \/\/ \u6b64\u5904\u7684\u8bed\u53e5\u65e0\u8bba\u662f\u5426\u53d1\u751f\u5f02\u5e38，\u90fd\u4f1a\u88ab\u6267\u884c\u5230
    \n}<\/p>\n

    \/\/ \u5982\u679c\u6ca1\u6709\u629b\u51fa\u5f02\u5e38，\u6216\u8005\u5f02\u5e38\u88ab\u6355\u83b7\u5904\u7406\u4e86，\u8fd9\u91cc\u7684\u4ee3\u7801\u4e5f\u4f1a\u6267\u884c
    \npublic static void main(String[] args) {
    \n try{
    \n int[] array = {1, 2, 3};
    \n array [100] = 10;
    \n array [0] = 10;
    \n }catch (ArrayIndexOutOfBoundsException e){
    \n System.out.println(e);
    \n }finally {
    \n System.out.println("Finally\u4e2d\u7684\u4ee3\u7801\u4e00\u5b9a\u4f1a\u6267\u884c");
    \n }<\/p>\n

    System.out.println("\u5982\u679c\u6ca1\u6709\u629b\u51fa\u5f02\u5e38，\u6216\u8005\u5f02\u5e38\u88ab\u5904\u7406\u4e86，try-catch\u540e\u7684\u4ee3\u7801\u4e5f\u4f1a\u6267\u884c");
    \n} <\/p>\n

    \u95ee\u9898：\u65e2\u7136 finally \u548c try-catch-finally \u540e\u7684\u4ee3\u7801\u90fd\u4f1a\u6267\u884c，\u90a3\u4e3a\u4ec0\u4e48\u8fd8\u8981\u6709 finally \u5462？<\/p>\n

    \u9700\u6c42：\u5b9e\u73b0getData\u65b9\u6cd5，\u5185\u90e8\u8f93\u5165\u4e00\u4e2a\u6574\u578b\u6570\u5b57，\u7136\u540e\u5c06\u8be5\u6570\u5b57\u8fd4\u56de，\u5e76\u518dmain\u65b9\u6cd5\u4e2d\u6253\u5370\u3002<\/p>\n

    public class TestFinally {
    \n public static int getData(){
    \n Scanner sc = null;
    \n try{
    \n sc = new Scanner(System.in);
    \n int data = sc.nextInt();
    \n return data;
    \n }catch (InputMismatchException e){
    \n e.printStackTrace();
    \n }finally {
    \n System.out.println("finally\u4e2d\u4ee3\u7801");
    \n }<\/p>\n

    System.out.println("try-catch-finally\u4e4b\u540e\u4ee3\u7801");
    \n if(null != sc){
    \n sc.close();
    \n }<\/p>\n

    return 0;
    \n }<\/p>\n

    public static void main(String[] args) {
    \n int data = getData();
    \n System.out.println(data);
    \n }
    \n} <\/p>\n

    \/\/ \u6b63\u5e38\u8f93\u5165\u65f6\u7a0b\u5e8f\u8fd0\u884c\u7ed3\u679c：<\/p>\n

    100<\/p>\n

    finally\u4e2d\u4ee3\u7801<\/p>\n

    100<\/p>\n

    \u6b64\u5916，\u4e0a\u8ff0\u4ee3\u7801\u7b49\u4ef7\u4e8e\u4e0b\u9762\u4ee3\u7801（\u66f4\u7b80\u4fbf，\u4e14\u4e0d\u7528\u5199close\u4f46idea\u4e5f\u4f1a\u81ea\u52a8\u56de\u6536\u8d44\u6e90）：<\/span><\/p>\n

    public static int getData(){
    \n try (Scanner sc = new Scanner(System.in)) {
    \n int data = sc.nextInt();
    \n return data;
    \n } catch (InputMismatchException e) {
    \n e.printStackTrace();
    \n } finally {
    \n System.out.println("finally\u4e2d\u4ee3\u7801");
    \n }
    \n System.out.println("try-catch-finally\u4e4b\u540e\u4ee3\u7801");
    \n return 0;
    \n} <\/p>\n

    \u4e0a\u8ff0\u7a0b\u5e8f，\u5982\u679c\u6b63\u5e38\u8f93\u5165，\u6210\u529f\u63a5\u6536\u8f93\u5165\u540e\u7a0b\u5e8f\u5c31\u8fd4\u56de\u4e86，try-catch-finally\u4e4b\u540e\u7684\u4ee3\u7801\u6839\u672c\u5c31\u6ca1\u6709\u6267\u884c，\u5373\u8f93\u5165\u6d41\u5c31\u6ca1\u6709\u88ab\u91ca\u653e，\u9020\u6210\u8d44\u6e90\u6cc4\u6f0f\u3002<\/p>\n

    \u6ce8\u610f：finally\u4e2d\u7684\u4ee3\u7801\u4e00\u5b9a\u4f1a\u6267\u884c\u7684，\u4e00\u822c\u5728finally\u4e2d\u8fdb\u884c\u4e00\u4e9b\u8d44\u6e90\u6e05\u7406\u7684\u626b\u5c3e\u5de5\u4f5c\u3002<\/p>\n

    \/\/ \u4e0b\u9762\u7a0b\u5e8f\u8f93\u51fa\u4ec0\u4e48？<\/p>\n

    public static void main(String[] args) {
    \n System.out.println(func());
    \n}<\/p>\n

    public static int func() {
    \n try {
    \n return 10;
    \n } finally {
    \n return 20;
    \n }
    \n} <\/p>\n

    A: 10 B: 20 C: 30 D: \u7f16\u8bd1\u5931\u8d25<\/p>\n

    \u7b54\u6848：B<\/span><\/p>\n

    finally \u6267\u884c\u7684\u65f6\u673a\u662f\u5728\u65b9\u6cd5\u8fd4\u56de\u4e4b\u524d(try \u6216\u8005 catch \u4e2d\u5982\u679c\u6709 return \u4f1a\u5728\u8fd9\u4e2a return \u4e4b\u524d\u6267\u884c finally)\u3002\u4f46\u662f\u5982\u679c finally \u4e2d\u4e5f\u5b58\u5728 return \u8bed\u53e5，\u90a3\u4e48\u5c31\u4f1a\u6267\u884c finally \u4e2d\u7684 return，\u4ece\u800c\u4e0d\u4f1a\u6267\u884c\u5230 try \u4e2d\u539f\u6709\u7684 return\u3002<\/p>\n

    \u4e00\u822c\u6211\u4eec\u4e0d\u5efa\u8bae\u5728 finally \u4e2d\u5199 return (\u88ab\u7f16\u8bd1\u5668\u5f53\u505a\u4e00\u4e2a\u8b66\u544a)\u3002<\/p>\n

    2.6 \u5f02\u5e38\u7684\u5904\u7406\u6d41\u7a0b<\/h3>\n

    \u5173\u4e8e\u201c\u8c03\u7528\u6808\u201d<\/p>\n

    \u65b9\u6cd5\u4e4b\u95f4\u662f\u5b58\u5728\u76f8\u4e92\u8c03\u7528\u5173\u7cfb\u7684，\u8fd9\u79cd\u8c03\u7528\u5173\u7cfb\u6211\u4eec\u53ef\u4ee5\u7528\u201c\u8c03\u7528\u6808\u201d\u6765\u63cf\u8ff0\u3002\u5728 JVM \u4e2d\u6709\u4e00\u5757\u5185\u5b58\u7a7a\u95f4\u79f0\u4e3a\u201c\u865a\u62df\u673a\u6808\u201d\u4e13\u95e8\u5b58\u50a8\u65b9\u6cd5\u4e4b\u95f4\u7684\u8c03\u7528\u5173\u7cfb\u3002\u5f53\u4ee3\u7801\u4e2d\u51fa\u73b0\u5f02\u5e38\u7684\u65f6\u5019，\u6211\u4eec\u5c31\u53ef\u4ee5\u4f7f\u7528 e.printStackTrace();\u7684\u65b9\u5f0f\u67e5\u770b\u51fa\u73b0\u5f02\u5e38\u4ee3\u7801\u7684\u8c03\u7528\u6808\u3002<\/p>\n

    \u5982\u679c\u672c\u65b9\u6cd5\u4e2d\u6ca1\u6709\u5408\u9002\u7684\u5904\u7406\u5f02\u5e38\u7684\u65b9\u5f0f，\u5c31\u4f1a\u6cbf\u7740\u8c03\u7528\u6808\u5411\u4e0a\u4f20\u9012\u3002<\/p>\n

    public static void main(String[] args) {
    \n try {
    \n func();
    \n } catch (ArrayIndexOutOfBoundsException e) {
    \n e.printStackTrace();
    \n }
    \n System.out.println("after try catch");
    \n}<\/p>\n

    public static void func() {
    \n int[] array = {1, 2, 3};
    \n System.out.println(array[100]);
    \n} <\/p>\n

    \u8fd0\u884c\u7ed3\u679c：<\/p>\n

    java.lang.ArrayIndexOutOfBoundsException: Index 100 out of bounds for length 3
    \n at LibrarySystem.func(LibrarySystem.java:107)
    \n at LibrarySystem.main(LibrarySystem.java:98)
    \nafter try catch <\/p>\n

    \u5982\u679c\u5411\u4e0a\u4f20\u9012\u90fd\u6ca1\u6709\u5408\u9002\u7684\u65b9\u6cd5\u5904\u7406\u5f02\u5e38，\u6700\u7ec8\u5c31\u4f1a\u4ea4\u7ed9 JVM \u5904\u7406，\u7a0b\u5e8f\u5c31\u4f1a\u5f02\u5e38\u7ec8\u6b62（\u548c\u6211\u4eec\u6700\u5f00\u59cb\u672a\u4f7f\u7528 try catch \u65f6\u662f\u4e00\u6837\u7684）\u3002<\/p>\n

    public static void main(String[] args) {
    \n func();
    \n System.out.println("after try catch");
    \n}<\/p>\n

    public static void func() {
    \n int[] arr = {1, 2, 3};
    \n System.out.println(arr[100]);
    \n} <\/p>\n

    \u8fd0\u884c\u7ed3\u679c：<\/p>\n

    Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 100 out of bounds for length 3
    \n at LibrarySystem.func(LibrarySystem.java:103)
    \n at LibrarySystem.main(LibrarySystem.java:97) <\/p>\n

    \u5f88\u660e\u663e：after try catch<\/span> \u5e76\u6ca1\u6709\u88ab\u6253\u5370<\/p>\n

    \u3010\u5f02\u5e38\u5904\u7406\u6d41\u7a0b\u603b\u7ed3\u3011<\/p>\n

      \n
    • \n

      \u7a0b\u5e8f\u5148\u6267\u884c try \u4e2d\u7684\u4ee3\u7801<\/p>\n<\/li>\n

    • \n

      \u5982\u679c try \u4e2d\u7684\u4ee3\u7801\u51fa\u73b0\u5f02\u5e38，\u5c31\u4f1a\u7ed3\u675f try \u4e2d\u7684\u4ee3\u7801，\u770b\u548c catch \u4e2d\u7684\u5f02\u5e38\u7c7b\u578b\u662f\u5426\u5339\u914d\u3002<\/p>\n<\/li>\n

    • \n

      \u5982\u679c\u627e\u5230\u5339\u914d\u7684\u5f02\u5e38\u7c7b\u578b，\u5c31\u4f1a\u6267\u884c catch \u4e2d\u7684\u4ee3\u7801<\/p>\n<\/li>\n

    • \n

      \u5982\u679c\u6ca1\u6709\u627e\u5230\u5339\u914d\u7684\u5f02\u5e38\u7c7b\u578b，\u5c31\u4f1a\u5c06\u5f02\u5e38\u5411\u4e0a\u4f20\u9012\u5230\u4e0a\u5c42\u8c03\u7528\u8005\u3002<\/p>\n<\/li>\n

    • \n

      \u65e0\u8bba\u662f\u5426\u627e\u5230\u5339\u914d\u7684\u5f02\u5e38\u7c7b\u578b，finally \u4e2d\u7684\u4ee3\u7801\u90fd\u4f1a\u88ab\u6267\u884c\u5230（\u5728\u8be5\u65b9\u6cd5\u7ed3\u675f\u4e4b\u524d\u6267\u884c）\u3002<\/p>\n<\/li>\n

    • \n

      \u5982\u679c\u4e0a\u5c42\u8c03\u7528\u8005\u4e5f\u6ca1\u6709\u5904\u7406\u4e86\u7684\u5f02\u5e38，\u5c31\u7ee7\u7eed\u5411\u4e0a\u4f20\u9012\u3002<\/p>\n<\/li>\n

    • \n

      \u4e00\u76f4\u5230 main \u65b9\u6cd5\u4e5f\u6ca1\u6709\u5408\u9002\u7684\u4ee3\u7801\u5904\u7406\u5f02\u5e38，\u5c31\u4f1a\u4ea4\u7ed9 JVM \u6765\u8fdb\u884c\u5904\u7406，\u6b64\u65f6\u7a0b\u5e8f\u5c31\u4f1a\u5f02\u5e38\u7ec8\u6b62\u3002<\/p>\n<\/li>\n<\/ul>\n

      \"\"\"\"<\/p>\n

      \n

      3. \u81ea\u5b9a\u4e49\u5f02\u5e38<\/h2>\n

      Java \u4e2d\u867d\u7136\u5df2\u7ecf\u5185\u7f6e\u4e86\u4e30\u5bcc\u7684\u5f02\u5e38\u7c7b，\u4f46\u662f\u5e76\u4e0d\u80fd\u5b8c\u5168\u8868\u793a\u5b9e\u9645\u5f00\u53d1\u4e2d\u6240\u9047\u5230\u7684\u4e00\u4e9b\u5f02\u5e38，\u6b64\u65f6\u5c31\u9700\u8981\u7ef4\u62a4\u7b26\u5408\u6211\u4eec\u5b9e\u9645\u60c5\u51b5\u7684\u5f02\u5e38\u7ed3\u6784\u3002<\/p>\n

      \u4f8b\u5982，\u6211\u4eec\u5b9e\u73b0\u4e00\u4e2a\u7528\u6237\u767b\u9646\u529f\u80fd\u3002<\/p>\n

      public class Login {
      \n private String userName = "admin";
      \n private String password = "123456";
      \n public void loginInfo(String userName, String password) {
      \n if (!this.userName.equals(userName)) {
      \n System.out.println("\u7528\u6237\u540d\u9519\u8bef！");
      \n return;
      \n }<\/p>\n

      if (!this.password.equals(password)) {
      \n System.out.println("\u5bc6\u7801\u9519\u8bef！");
      \n return;
      \n }
      \n System.out.println("\u767b\u9646\u6210\u529f");
      \n }<\/p>\n

      public static void main(String[] args) {
      \n Login login = new Login();
      \n login.loginInfo("admin111", "123456");
      \n }
      \n} <\/p>\n

      \u6b64\u65f6\u6211\u4eec\u5728\u5904\u7406\u7528\u6237\u540d\u5bc6\u7801\u9519\u8bef\u7684\u65f6\u5019\u53ef\u80fd\u5c31\u9700\u8981\u629b\u51fa\u4e24\u79cd\u5f02\u5e38\u3002\u6211\u4eec\u53ef\u4ee5\u57fa\u4e8e\u5df2\u6709\u7684\u5f02\u5e38\u7c7b\u8fdb\u884c\u6269\u5c55（\u7ee7\u627f），\u521b\u5efa\u548c\u6211\u4eec\u4e1a\u52a1\u76f8\u5173\u7684\u5f02\u5e38\u7c7b\u3002<\/p>\n

      3.1 \u5b9e\u73b0\u81ea\u5b9a\u4e49\u5f02\u5e38<\/p>\n

      \u5177\u4f53\u65b9\u5f0f：<\/p>\n

    • \n

      \u81ea\u5b9a\u4e49\u5f02\u5e38\u7c7b，\u7136\u540e\u7ee7\u627f\u81ea Exception \u6216\u8005 RunTimeException<\/p>\n<\/li>\n

    • \n

      \u5b9e\u73b0\u4e00\u4e2a\u5e26\u6709 String \u7c7b\u578b\u53c2\u6570\u7684\u6784\u9020\u65b9\u6cd5，\u53c2\u6570\u542b\u4e49：\u51fa\u73b0\u5f02\u5e38\u7684\u539f\u56e0<\/p>\n<\/li>\n

      class UserNameException extends Exception {
      \n public UserNameException(String message) {
      \n super(message);
      \n }
      \n}<\/p>\n

      class PasswordException extends Exception {
      \n public PasswordException(String message) {
      \n super(message);
      \n }
      \n} <\/p>\n

      PS：<\/p>\n

      Java\u5b98\u65b9\u89c4\u5b9a\u81ea\u5b9a\u4e49\u5f02\u5e38\u7ee7\u627fException\u5219\u8be5\u81ea\u5b9a\u4e49\u5f02\u5e38\u4e3a\u7f16\u8bd1\u65f6\u5f02\u5e38，<\/p>\n

      \u4f46\u5f53\u5b83\u7ee7\u627fRuntimeException\u5219\u8be5\u81ea\u5b9a\u4e49\u5f02\u5e38\u4e3a\u8fd0\u884c\u65f6\u5f02\u5e38\u3002<\/p>\n

      \u6b64\u65f6\u6211\u4eec\u7684 login \u4ee3\u7801\u53ef\u4ee5\u6539\u6210：<\/p>\n

      public class Login {
      \n private String userName = "admin";
      \n private String password = "123456";<\/p>\n

      public void loginInfo(String userName, String password)
      \n throws UserNameException, PasswordException {
      \n if (!this.userName.equals(userName)) {
      \n throw new UserNameException("\u7528\u6237\u540d\u9519\u8bef！");
      \n }<\/p>\n

      if (!this.password.equals(password)) {
      \n throw new PasswordException("\u7528\u6237\u540d\u9519\u8bef！");
      \n }
      \n System.out.println("\u767b\u9646\u6210\u529f");
      \n }<\/p>\n

      public static void main(String[] args) {
      \n try {
      \n Login login = new Login();
      \n login.loginInfo("admin", "123456");
      \n } catch (UserNameException e) {
      \n e.printStackTrace();
      \n } catch (PasswordException e) {
      \n e.printStackTrace();
      \n }
      \n }
      \n} <\/p>\n

      \u6ce8\u610f\u4e8b\u9879<\/p>\n

        \n
      • \n

        \u81ea\u5b9a\u4e49\u5f02\u5e38\u901a\u5e38\u4f1a\u7ee7\u627f\u81ea Exception \u6216\u8005 RuntimeException<\/p>\n<\/li>\n

      • \n

        \u7ee7\u627f\u81ea Exception \u7684\u5f02\u5e38\u9ed8\u8ba4\u662f\u53d7\u67e5\u5f02\u5e38<\/p>\n<\/li>\n

      • \n

        \u7ee7\u627f\u81ea RuntimeException \u7684\u5f02\u5e38\u9ed8\u8ba4\u662f\u975e\u53d7\u67e5\u5f02\u5e38<\/p>\n<\/li>\n<\/ul>\n

        \n

        4. \u5c0f\u8bd5\u725b\u5200（9\u9053\u9898）<\/h2>\n

        1. \u4ee5\u4e0b\u54ea\u4e2a\u4e0d\u662fJava\u4e2d\u7684\u53d7\u68c0\u5f02\u5e38（checked exception）？<\/p>\n

        A. IOException<\/p>\n

        B. SQLException<\/p>\n

        C. NullPointerException<\/p>\n

        D. ClassNotFoundException<\/p>\n

        \u7b54\u6848：C<\/p>\n

        2. \u5173\u4e8etry-catch-finally\u8bed\u53e5，\u4ee5\u4e0b\u54ea\u4e2a\u8bf4\u6cd5\u662f\u6b63\u786e\u7684？<\/p>\n

        A. finally\u5757\u603b\u662f\u4f1a\u6267\u884c，\u5373\u4f7ftry\u5757\u4e2d\u6709return\u8bed\u53e5<\/p>\n

        B. \u5982\u679ccatch\u5757\u4e2d\u629b\u51fa\u5f02\u5e38，finally\u5757\u5c31\u4e0d\u4f1a\u6267\u884c<\/p>\n

        C. \u4e00\u4e2atry\u5757\u540e\u9762\u5fc5\u987b\u8ddf\u7740\u81f3\u5c11\u4e00\u4e2acatch\u5757<\/p>\n

        D. finally\u5757\u4e2d\u7684return\u8bed\u53e5\u4f1a\u8986\u76d6try\u6216catch\u5757\u4e2d\u7684return\u8bed\u53e5<\/p>\n

        \u7b54\u6848：AD<\/p>\n

        3. \u5173\u4e8e\u5f02\u5e38\u5904\u7406，\u4ee5\u4e0b\u54ea\u4e2a\u8bf4\u6cd5\u662f\u9519\u8bef\u7684？<\/p>\n

        A. \u5b50\u7c7b\u65b9\u6cd5\u629b\u51fa\u7684\u5f02\u5e38\u8303\u56f4\u4e0d\u80fd\u5927\u4e8e\u7236\u7c7b\u65b9\u6cd5\u58f0\u660e\u7684\u5f02\u5e38\u8303\u56f4<\/p>\n

        B. \u53ef\u4ee5\u5728catch\u5757\u4e2d\u6355\u83b7\u591a\u4e2a\u5f02\u5e38\u7c7b\u578b<\/p>\n

        C. RuntimeException\u53ca\u5176\u5b50\u7c7b\u90fd\u662f\u975e\u53d7\u68c0\u5f02\u5e38<\/p>\n

        D. \u4f7f\u7528throw\u5173\u952e\u5b57\u53ef\u4ee5\u624b\u52a8\u629b\u51fa\u5f02\u5e38，\u4f46\u4e0d\u80fd\u629b\u51faError<\/p>\n

        \u7b54\u6848：D，（\u6bd4\u5982\u4e0b\u56fe：）\u867d\u7136\u8bed\u6cd5\u652f\u6301，\u4f46\u4e0d\u5efa\u8bae\u8fd9\u4e48\u505a<\/p>\n

        \"\"<\/p>\n

        4. \u8bf7\u5206\u6790\u7a0b\u5e8f\u4f1a\u8f93\u51fa\u4ec0\u4e48\u5185\u5bb9<\/p>\n

        public static void main(String[] args) {
        \n func();
        \n System.out.println("main：after try catch");
        \n}<\/p>\n

        public static void func() {
        \n try {
        \n int[] array = {1, 2, 3};
        \n System.out.println(array[100]);
        \n } catch (ArrayIndexOutOfBoundsException e) {
        \n e.printStackTrace();
        \n }
        \n System.out.println("func：after try catch");
        \n}<\/p>\n

        \/\/\u8fd9\u4e2a\u4f1a\u8f93\u51fa\u4ec0\u4e48？\u600e\u4e48\u5206\u6790？ <\/p>\n

        \u9884\u671f\u8f93\u51fa\u7ed3\u679c：<\/p>\n

        java.lang.ArrayIndexOutOfBoundsException: Index 100 out of bounds for length 3 \u00a0 \u00a0 at YourClassName.func(YourClassName.java:\u884c\u53f7) \u00a0 \u00a0 at YourClassName.main(YourClassName.java:\u884c\u53f7) func：after try catch main：after try catch<\/p>\n

        5. Java\u5f02\u5e38\u5904\u7406\u673a\u5236<\/p>\n

        \"\"<\/p>\n

        C<\/p>\n

        6. \u5206\u6790\u4ee3\u7801<\/p>\n

        \"\"<\/p>\n

        \u4f1a\u6b63\u5e38\u8f93\u51fa：testMethod<\/p>\n

        7. \u5206\u6790\u7a0b\u5e8f\u8fd0\u884c\u7ed3\u679c<\/p>\n

        \"\"\"\"<\/p>\n

        \u6392\u9664\u6cd5，\u56e0\u4e3a\u540c\u4e00\u65f6\u523b\u53ea\u80fd\u629b\u51fa\u4e00\u4e2a\u5f02\u5e38<\/span><\/p>\n

        8. \u5355\u9009<\/p>\n

        \"\"<\/p>\n

        \u7b54\u6848：BD<\/p>\n

        B：\u7f16\u8bd1\u65f6\u5f02\u5e38\u53ef\u4ee5\u62ffthrows\u6765\u5904\u7406<\/p>\n

        D：\u6bd4\u5982\u7a7a\u6307\u9488\u5f02\u5e38\u53ef\u4ee5\u7528throws\u5173\u952e\u5b57\u4e00\u76f4\u5c06\u5f02\u5e38\u5f80\u5916\u629b\u76f4\u5230\u8ba9JVM\u53bb\u5904\u7406<\/p>\n

        9.<\/p>\n

        \"\"<\/p>\n

        C<\/p>\n","protected":false},"excerpt":{"rendered":"

        \u76ee\u5f55 1. \u5f02\u5e38\u7684\u6982\u5ff5\u4e0e\u4f53\u7cfb\u7ed3\u6784 1.1 \u5f02\u5e38\u7684\u6982\u5ff5 1.1.1 \u7b97\u672f\u5f02\u5e38 1.1.2\u00a0\u6570\u7ec4\u8d8a\u754c\u5f02\u5e38 1.1.3 \u7a7a\u6307\u9488\u5f02\u5e38 1.2 \u5f02\u5e38\u7684\u4f53\u7cfb\u7ed3\u6784 1.3 \u5f02\u5e38\u7684\u5206\u7c7b 1.3.1 \u7f16\u8bd1\u65f6\u5f02\u5e38 1.3.1.1 \u4f8b\u5b501： 1.3.1.2 \u4f8b\u5b502： 1.3.2\u00a0\u8fd0\u884c\u65f6\u5f02\u5e38 2. \u5f02\u5e38\u7684\u5904\u7406 2.1 \u9632\u5fa1\u5f0f\u7f16\u7a0b 2.1.1 LBYL: Look Before You Leap. \u5728\u64cd\u4f5c\u4e4b\u524d\u5c31\u505a\u5145\u5206\u7684\u68c0\u67e5\u3002\u5373：\u4e8b\u524d\u9632\u5fa1\u578b 2.1.2 EAFP<\/p>\n","protected":false},"author":2,"featured_media":77444,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[8500,8502,8501,99,5466,5918],"topic":[],"class_list":["post-77459","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-try-catch","tag-8502","tag-8501","tag-java","tag-5466","tag-5918"],"yoast_head":"\n15. Java\u5f02\u5e38\u5904\u7406\u5168\u89e3\u6790\uff1a\u4ece\u5e95\u5c42\u539f\u7406\u5230\u5b9e\u6218\u907f\u5751\u6307\u5357 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/77459.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"15. Java\u5f02\u5e38\u5904\u7406\u5168\u89e3\u6790\uff1a\u4ece\u5e95\u5c42\u539f\u7406\u5230\u5b9e\u6218\u907f\u5751\u6307\u5357 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u76ee\u5f55 1. \u5f02\u5e38\u7684\u6982\u5ff5\u4e0e\u4f53\u7cfb\u7ed3\u6784 1.1 \u5f02\u5e38\u7684\u6982\u5ff5 1.1.1 \u7b97\u672f\u5f02\u5e38 1.1.2\u00a0\u6570\u7ec4\u8d8a\u754c\u5f02\u5e38 1.1.3 \u7a7a\u6307\u9488\u5f02\u5e38 1.2 \u5f02\u5e38\u7684\u4f53\u7cfb\u7ed3\u6784 1.3 \u5f02\u5e38\u7684\u5206\u7c7b 1.3.1 \u7f16\u8bd1\u65f6\u5f02\u5e38 1.3.1.1 \u4f8b\u5b501： 1.3.1.2 \u4f8b\u5b502： 1.3.2\u00a0\u8fd0\u884c\u65f6\u5f02\u5e38 2. \u5f02\u5e38\u7684\u5904\u7406 2.1 \u9632\u5fa1\u5f0f\u7f16\u7a0b 2.1.1 LBYL: Look Before You Leap. \u5728\u64cd\u4f5c\u4e4b\u524d\u5c31\u505a\u5145\u5206\u7684\u68c0\u67e5\u3002\u5373：\u4e8b\u524d\u9632\u5fa1\u578b 2.1.2 EAFP\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/77459.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-24T10:43:26+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260224104323-699d80cb38a5c.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"9 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/77459.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/77459.html\",\"name\":\"15. Java\u5f02\u5e38\u5904\u7406\u5168\u89e3\u6790\uff1a\u4ece\u5e95\u5c42\u539f\u7406\u5230\u5b9e\u6218\u907f\u5751\u6307\u5357 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"isPartOf\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\"},\"datePublished\":\"2026-02-24T10:43:26+00:00\",\"dateModified\":\"2026-02-24T10:43:26+00:00\",\"author\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/77459.html#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.wsisp.com\/helps\/77459.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/77459.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.wsisp.com\/helps\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"15. Java\u5f02\u5e38\u5904\u7406\u5168\u89e3\u6790\uff1a\u4ece\u5e95\u5c42\u539f\u7406\u5230\u5b9e\u6218\u907f\u5751\u6307\u5357\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\",\"url\":\"https:\/\/www.wsisp.com\/helps\/\",\"name\":\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"description\":\"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"contentUrl\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"caption\":\"admin\"},\"sameAs\":[\"http:\/\/wp.wsisp.com\"],\"url\":\"https:\/\/www.wsisp.com\/helps\/author\/admin\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"15. Java\u5f02\u5e38\u5904\u7406\u5168\u89e3\u6790\uff1a\u4ece\u5e95\u5c42\u539f\u7406\u5230\u5b9e\u6218\u907f\u5751\u6307\u5357 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/77459.html","og_locale":"zh_CN","og_type":"article","og_title":"15. Java\u5f02\u5e38\u5904\u7406\u5168\u89e3\u6790\uff1a\u4ece\u5e95\u5c42\u539f\u7406\u5230\u5b9e\u6218\u907f\u5751\u6307\u5357 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"\u76ee\u5f55 1. \u5f02\u5e38\u7684\u6982\u5ff5\u4e0e\u4f53\u7cfb\u7ed3\u6784 1.1 \u5f02\u5e38\u7684\u6982\u5ff5 1.1.1 \u7b97\u672f\u5f02\u5e38 1.1.2\u00a0\u6570\u7ec4\u8d8a\u754c\u5f02\u5e38 1.1.3 \u7a7a\u6307\u9488\u5f02\u5e38 1.2 \u5f02\u5e38\u7684\u4f53\u7cfb\u7ed3\u6784 1.3 \u5f02\u5e38\u7684\u5206\u7c7b 1.3.1 \u7f16\u8bd1\u65f6\u5f02\u5e38 1.3.1.1 \u4f8b\u5b501： 1.3.1.2 \u4f8b\u5b502： 1.3.2\u00a0\u8fd0\u884c\u65f6\u5f02\u5e38 2. \u5f02\u5e38\u7684\u5904\u7406 2.1 \u9632\u5fa1\u5f0f\u7f16\u7a0b 2.1.1 LBYL: Look Before You Leap. \u5728\u64cd\u4f5c\u4e4b\u524d\u5c31\u505a\u5145\u5206\u7684\u68c0\u67e5\u3002\u5373：\u4e8b\u524d\u9632\u5fa1\u578b 2.1.2 EAFP","og_url":"https:\/\/www.wsisp.com\/helps\/77459.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2026-02-24T10:43:26+00:00","og_image":[{"url":"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260224104323-699d80cb38a5c.png"}],"author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"9 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.wsisp.com\/helps\/77459.html","url":"https:\/\/www.wsisp.com\/helps\/77459.html","name":"15. Java\u5f02\u5e38\u5904\u7406\u5168\u89e3\u6790\uff1a\u4ece\u5e95\u5c42\u539f\u7406\u5230\u5b9e\u6218\u907f\u5751\u6307\u5357 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","isPartOf":{"@id":"https:\/\/www.wsisp.com\/helps\/#website"},"datePublished":"2026-02-24T10:43:26+00:00","dateModified":"2026-02-24T10:43:26+00:00","author":{"@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41"},"breadcrumb":{"@id":"https:\/\/www.wsisp.com\/helps\/77459.html#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.wsisp.com\/helps\/77459.html"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.wsisp.com\/helps\/77459.html#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.wsisp.com\/helps"},{"@type":"ListItem","position":2,"name":"15. Java\u5f02\u5e38\u5904\u7406\u5168\u89e3\u6790\uff1a\u4ece\u5e95\u5c42\u539f\u7406\u5230\u5b9e\u6218\u907f\u5751\u6307\u5357"}]},{"@type":"WebSite","@id":"https:\/\/www.wsisp.com\/helps\/#website","url":"https:\/\/www.wsisp.com\/helps\/","name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","description":"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41","name":"admin","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/","url":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","contentUrl":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","caption":"admin"},"sameAs":["http:\/\/wp.wsisp.com"],"url":"https:\/\/www.wsisp.com\/helps\/author\/admin"}]}},"_links":{"self":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/77459","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/comments?post=77459"}],"version-history":[{"count":0,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/77459\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media\/77444"}],"wp:attachment":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media?parent=77459"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/categories?post=77459"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/tags?post=77459"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/topic?post=77459"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}