{"id":79955,"date":"2026-03-03T20:25:07","date_gmt":"2026-03-03T12:25:07","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/79955.html"},"modified":"2026-03-03T20:25:07","modified_gmt":"2026-03-03T12:25:07","slug":"java%e5%88%9d%e5%a7%8b%ef%bc%881%ef%bc%89%e3%80%90%e8%a1%a5%e5%85%85%e3%80%91","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/79955.html","title":{"rendered":"java\u521d\u59cb\uff081\uff09\u3010\u8865\u5145\u3011"},"content":{"rendered":"

3.\u7c7b\u578b\u8f6c\u6362<\/h3>\n

3.1 \u81ea\u52a8\u7c7b\u578b\u8f6c\u6362<\/h4>\n

\u7a0b\u5e8f\u4f1a\u81ea\u52a8\u53bb\u8bc6\u522b\u6570\u636e\u7c7b\u578b\u5e76\u5b8c\u6210\u8f6c\u6362，\u4e0d\u662f\u6240\u6709\u7684\u6570\u636e\u90fd\u80fd\u81ea\u52a8\u8f6c\u6362，\u53ea\u80fd\u4ece\u4f4e\u5b57\u8282\u5411\u9ad8\u5b57\u8282\u8f6c\u6362，\u53cd\u4e4b\u5219\u4e0d\u884c\u3002<\/p>\n

（1）\u53ef\u4ee5\u5b8c\u6210\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\u5982\u4e0b\u4f8b\u6240\u793a：<\/p>\n

public class Test {
\n public static void main(String[] args){
\n int num = 10;
\n double num2 = num;
\n System.out.println(num2);
\n }
\n}<\/p>\n

\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b：<\/p>\n

10.0 <\/p>\n

（2）\u4e0d\u53ef\u4ee5\u5b8c\u6210\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\u5982\u4e0b\u4f8b\u6240\u793a，\u4ee3\u7801\u4f1a\u62a5\u9519<\/p>\n

public class Test {
\n public static void main(String[] args){
\n long i = 1;
\n int ii = i;
\n }
\n} <\/p>\n

3.2 \u5f3a\u5236\u7c7b\u578b\u8f6c\u6362<\/h4>\n

\u00a0 \u00a0 \u00a0 \u00a0\u5982\u679c\u7a0b\u5e8f\u65e0\u6cd5\u5b8c\u6210\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362，\u5219\u9700\u8981\u8fdb\u884c\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362，\u4e0d\u63a8\u8350\u4f7f\u7528，\u6709\u53ef\u80fd\u9020\u6210\u6570\u636e\u7cbe\u5ea6\u635f\u5931\u3002\u3010\u6ce8\u610f：\u53ea\u80fd\u662f\u76f8\u540c\u7c7b\u578b\u7684\u624d\u80fd\u8fdb\u884c\u5f3a\u5236\u8f6c\u6362（\u4f8b\u5982\u6570\u5b57\u8f6c\u6570\u5b57，\u4e0d\u80fd\u51fa\u73b0\u6570\u5b57\u8f6c\u5b57\u7b26）\u3011<\/p>\n

\u5f3a\u5236\u8f6c\u6362\u9020\u6210\u7cbe\u5ea6\u635f\u5931\u5982\u4e0b\u4f8b\u6240\u793a：<\/p>\n

public class Test {
\n public static void main(String[] args){
\n double num1 = 10.6;
\n int num2 = (int)num1;
\n System.out.println(num2);
\n }
\n}<\/p>\n

\u7ed3\u679c\u5982\u4e0b\u56fe\u6240\u793a：<\/p>\n

10 <\/p>\n

3.3 \u5f15\u7528\u7c7b\u578b<\/h4>\n

\u00a0 \u00a0 \u00a0 \u00a0\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\u89c4\u5219\u662f\u5b50\u7c7b\u5bf9\u8c61\u53ef\u4ee5\u8f6c\u6362\u4e3a\u7236\u7c7b\u5bf9\u8c61，\u4f46\u662f\u7236\u7c7b\u5bf9\u8c61\u4e0d\u80fd\u8f6c\u6362\u4e3a\u5b50\u7c7b\u5bf9\u8c61\u3002\u3010\u7236\u7c7b\u5bf9\u8c61\u8f6c\u5b50\u7c7b\u5fc5\u987b\u4f7f\u7528\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362，\u5982\u679c\u4e24\u4e2a\u7c7b\u4e4b\u95f4\u6ca1\u6709\u7236\u5b50\u7c7b\u7ee7\u627f\u5173\u7cfb，\u5219\u65e0\u6cd5\u8fdb\u884c\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u3011<\/p>\n

（1）\u5b50\u7c7b\u5bf9\u8c61\u8f6c\u6362\u4e3a\u7236\u7c7b\u5bf9\u8c61\u9700\u8981\u5f3a\u5236\u8f6c\u6362：<\/p>\n

public class Test {
\n public static void main(String[] args){
\n People people = new People();
\n Student student = (Student) people;
\n }
\n } <\/p>\n

（2）\u7236\u7c7b\u5bf9\u8c61\u8f6c\u6362\u4e3a\u5b50\u7c7b\u5bf9\u8c61\u5219\u4f1a\u81ea\u52a8\u8f6c\u6362：<\/p>\n

public class Test {
\n public static void main(String[] args){
\n Student student = new Student();
\n People people = student;
\n }
\n } <\/p>\n

\u5f53\u53d6\u6d88\u4e24\u8005\u7684\u7ee7\u627f\u5173\u7cfb\u65f6，\u65e0\u8bba\u662f\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u8fd8\u662f\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\u90fd\u4f1a\u5931\u6548，\u4e0a\u8ff0\u4ee3\u7801\u7686\u4f1a\u62a5\u9519\u3002<\/p>\n

3.4\u62c6\u7bb1\u548c\u88c5\u7bb1<\/h4>\n

\u00a0 \u00a0 \u00a0 \u5b83\u4e5f\u5c5e\u4e8e\u7c7b\u578b\u8f6c\u6362，\u662f\u5f15\u7528\u7c7b\u578b\u548c\u57fa\u672c\u6570\u636e\u7c7b\u578b\u4e4b\u95f4\u7684\u8f6c\u6362\u3002<\/p>\n

4.\u8fd0\u7b97\u7b26<\/h3>\n

4.1 \u903b\u8f91\u8fd0\u7b97\u7b26<\/h4>\n

\u00a0 \u00a0 \u00a0 \u00a0\u53ea\u80fd\u7528\u4e8eboolean\u7c7b\u578b\u7684\u6570\u636e，\u5224\u65adboolean\u6570\u636e\u4e4b\u95f4\u7684\u903b\u8f91\u5173\u7cfb，\u5305\u62ec\u4e0e\u3001\u6216\u3001\u975e3\u79cd\u903b\u8f91\u5173\u7cfb\u3002<\/p>\n

（1）\u4e0e：&；（2）\u77ed\u8def\u4e0e：&&；（3）\u6216：|；（4）\u77ed\u8def\u6216：||；（5）\u975e：!\u3002<\/p>\n

4.1.1 \u8fd0\u7b97\u7ed3\u679c<\/h5>\n

（1）A & B，\u53ea\u6709\u5f53 A \u548c B \u90fd\u4e3a true \u7684\u65f6\u5019\u7ed3\u679c\u4e3a true，\u5426\u5219\u4e3a false<\/p>\n

（2）A | B，\u53ea\u8981 A \u6216 B \u6709\u4e00\u4e2a\u4e3a true，\u5219\u7ed3\u679c\u4e3a true，\u5426\u5219\u4e3a false<\/p>\n

（3）A && B，\u53ea\u6709\u5f53 A \u548c B \u90fd\u4e3a true \u7684\u65f6\u5019\u7ed3\u679c\u4e3a true，\u5426\u5219\u4e3a false<\/p>\n

（4）A || B，\u53ea\u8981 A \u6216 B \u6709\u4e00\u4e2a\u4e3a true，\u5219\u7ed3\u679c\u4e3a true，\u5426\u5219\u4e3a false<\/p>\n

（5）! A，\u53d6\u53cd<\/p>\n

4.1.2\u00a0&&\u6bd4&\u7684\u6548\u7387\u66f4\u9ad8<\/h5>\n

\u00a0 \u00a0 \u00a0 \u00a0&\u8fd0\u7b97\u7b26\u65e0\u8bba\u5982\u4f55\u90fd\u8981\u8fd0\u7b97\u4e24\u6b21\u5f97\u51fa\u7ed3\u679c\u3010\u5373\u5148\u6c42\u51faA，\u518d\u6c42\u51faB，\u6700\u540e\u5f97\u51fa\u6700\u7ec8\u7ed3\u679c\u3011；&&\u8fd0\u7b97\u7b26\u4f1a\u51fa\u73b0\u53ea\u8fd0\u7b97\u4e00\u6b21\u5c31\u80fd\u5f97\u51fa\u7ed3\u679c\u7684\u60c5\u51b5\u3010\u5373\u82e5\u6c42\u51faA\u7684\u7ed3\u679c\u82e5\u662ffalse，\u5219\u4e0d\u4f1a\u8ba1\u7b97B\u7684\u7ed3\u679c，\u5426\u5219\u4f1a\u518d\u8ba1\u7b97A\u7684\u7ed3\u679c，\u5f97\u51fa\u6700\u7ec8\u7ed3\u8bba\u3011\u3002| \u4e0e || \u7684\u539f\u7406\u662f\u4e00\u6837\u7684\u3002<\/p>\n

\u6ce8：&\u4e0e&&\u3001++\u5728\u524d\u4e0e++\u5728\u540e\u7684\u533a\u522b：<\/p>\n

（1）&\u4e0e&&\u7684\u533a\u522b：<\/p>\n

public class Test {
\n public static void main(String[] args){
\n int num1 = 10;
\n int num2 = 11;
\n System.out.println((num1++==num2)&(++num1==num2));
\n System.out.println(num1);
\n }
\n } <\/p>\n

\u7ed3\u679c\u5982\u4e0b：<\/p>\n

false
\n12
\n public class Test {
\n public static void main(String[] args){
\n int num1 = 10;
\n int num2 = 11;
\n System.out.println((num1++==num2)&&(++num1==num2));
\n System.out.println(num1);
\n }
\n } <\/p>\n

\u7ed3\u679c\u5982\u4e0b：<\/p>\n

false
\n11<\/p>\n

&&\u8fd0\u7b97\u7b26\u6bd4&\u8fd0\u7b97\u7b26\u5c11\u4e00\u6b21\u8fd0\u7b97，\u6700\u7ec8num1\u7684\u7ed3\u679c\u4f1a\u51fa\u73b0\u53d8\u5316\u3002<\/p>\n

（2）++\u5728\u524d\u4e0e++\u5728\u540e\u7684\u533a\u522b：<\/p>\n

++\u5728\u524d\u65f6，\u662f\u5148\u8ba1\u7b97num1=num1+1，\u8ba1\u7b97\u5b8c\u4e4b\u540e\u518d\u8ba1\u7b97num1==num2\u7684\u7ed3\u679c；++\u5728\u540e\u65f6，\u662f\u5148\u8ba1\u7b97num1==num2\u7684\u7ed3\u679c，\u8ba1\u7b97\u5b8c\u4e4b\u540e，\u518d\u8ba1\u7b97num1=num1+1\u3002<\/p>\n

4.2\u4f4d\u8fd0\u7b97\u7b26<\/h4>\n

4.2.1 \u5341\u8fdb\u5236\u548c\u4e8c\u8fdb\u5236\u7684\u8f6c\u6362：\u76ee\u6807\u6570\u9664\u4ee52，\u82e5\u80fd\u9664\u5c3d，\u5219\u6539\u4e3a\u8bb0\u4f5c0，\u5982\u679c\u9664\u4e0d\u5c3d\u8be5\u4f4d\u8bb0\u4f5c1，\u518d\u5bf9\u5546\u7ee7\u7eed\u9664\u4ee52，\u4ee5\u6b64\u7c7b\u63a8，\u76f4\u5230\u5546\u4e3a0，\u7136\u540e\u628a\u6bcf\u4e00\u4f4d\u7684\u7ed3\u679c\u53cd\u5e8f\u7ec4\u5408\u5c31\u662f\u5bf9\u5e94\u7684\u4e8c\u8fdb\u5236\u3002<\/p>\n

4.2.2 \u4e8c\u8fdb\u5236\u8f6c\u5341\u8fdb\u5236：\u4ece\u76ee\u6807\u6570\u6700\u53f3\u4fa7\u7b97\u8d77，\u672c\u4f4d\u7684\u6570\u503c\u4e58\u4ee5\u672c\u4f4d\u7684\u6743\u91cd（2\u7684\u7b2c\u51e0\u4f4d\u7684\u4f4d\u6570\u51cf\u4e00\u6b21\u65b9）\u5f97\u5230\u4e00\u4e2a\u4e58\u79ef，\u5c06\u6bcf\u4e00\u4f4d\u7684\u4e58\u79ef\u76f8\u52a0\u5c31\u662f\u5bf9\u5e94\u7684\u5341\u8fdb\u5236\u3002<\/p>\n

4.3 \u8fd0\u7b97\u7b26<\/h4>\n

\u00a0 \u00a0（1）&（\u6309\u4f4d\u4e0e）；（2）|（\u6309\u4f4d\u6216）；（3）^（\u6309\u4f4d\u5f02\u6216）<\/p>\n

4.4 \u8fd0\u7b97\u65b9\u5f0f<\/h4>\n

（1）A & B：\u6bcf\u4e00\u4f4d\u7684\u6570\u5b57\u4e00\u4e00\u5bf9\u5e94，\u5982\u679c\u90fd\u4e3a1，\u5219\u8be5\u4f4d\u8bb0\u4f5c1，\u5426\u5219\u4e3a0<\/p>\n

（2）A | B：\u6bcf\u4e00\u4f4d\u7684\u6570\u5b57\u4e00\u4e00\u5bf9\u5e94，\u53ea\u8981\u6709\u4e00\u4e2a\u4e3a1，\u5219\u8be5\u4f4d\u8bb0\u4f5c1，\u5426\u5219\u4e3a0<\/p>\n

（3）A ^ B：\u6bcf\u4e00\u4f4d\u7684\u6570\u5b57\u4e00\u4e00\u5bf9\u5e94，\u76f8\u540c\u8bb0\u4f5c0，\u4e0d\u540c\u8bb0\u4f5c1\u3002<\/p>\n

\n

\n","protected":false},"excerpt":{"rendered":"

3.\u7c7b\u578b\u8f6c\u6362
\n3.1 \u81ea\u52a8\u7c7b\u578b\u8f6c\u6362
\n\u7a0b\u5e8f\u4f1a\u81ea\u52a8\u53bb\u8bc6\u522b\u6570\u636e\u7c7b\u578b\u5e76\u5b8c\u6210\u8f6c\u6362，\u4e0d\u662f\u6240\u6709\u7684\u6570\u636e\u90fd\u80fd\u81ea\u52a8\u8f6c\u6362，\u53ea\u80fd\u4ece\u4f4e\u5b57\u8282\u5411\u9ad8\u5b57\u8282\u8f6c\u6362，\u53cd\u4e4b\u5219\u4e0d\u884c\u3002
\n（1）\u53ef\u4ee5\u5b8c\u6210\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\u5982\u4e0b\u4f8b\u6240\u793a：
\npublic class Test {public static void main(String[] args){int num 10;double num2 num;System.out.printl<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,190],"topic":[],"class_list":["post-79955","post","type-post","status-publish","format-standard","hentry","category-server","tag-java","tag-190"],"yoast_head":"\njava\u521d\u59cb\uff081\uff09\u3010\u8865\u5145\u3011 - \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\/79955.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"java\u521d\u59cb\uff081\uff09\u3010\u8865\u5145\u3011 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"3.\u7c7b\u578b\u8f6c\u6362 3.1 \u81ea\u52a8\u7c7b\u578b\u8f6c\u6362 \u7a0b\u5e8f\u4f1a\u81ea\u52a8\u53bb\u8bc6\u522b\u6570\u636e\u7c7b\u578b\u5e76\u5b8c\u6210\u8f6c\u6362，\u4e0d\u662f\u6240\u6709\u7684\u6570\u636e\u90fd\u80fd\u81ea\u52a8\u8f6c\u6362，\u53ea\u80fd\u4ece\u4f4e\u5b57\u8282\u5411\u9ad8\u5b57\u8282\u8f6c\u6362，\u53cd\u4e4b\u5219\u4e0d\u884c\u3002 （1）\u53ef\u4ee5\u5b8c\u6210\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\u5982\u4e0b\u4f8b\u6240\u793a： public class Test {public static void main(String[] args){int num 10;double num2 num;System.out.printl\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/79955.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-03-03T12:25:07+00:00\" \/>\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=\"2 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/79955.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/79955.html\",\"name\":\"java\u521d\u59cb\uff081\uff09\u3010\u8865\u5145\u3011 - 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