{"id":76190,"date":"2026-02-21T22:49:08","date_gmt":"2026-02-21T14:49:08","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/76190.html"},"modified":"2026-02-21T22:49:08","modified_gmt":"2026-02-21T14:49:08","slug":"%e6%b3%a8%e6%84%8f%ef%bc%9a%e5%a4%9a%e6%80%81%e4%b8%8d%e6%98%af%e5%a4%9a%e5%8f%98%e6%80%81","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/76190.html","title":{"rendered":"\u6ce8\u610f\uff1a\u591a\u6001\u4e0d\u662f\u201c\u591a\u53d8\u6001\u201d"},"content":{"rendered":"

1，\u4ec0\u4e48\u662f\u591a\u6001？<\/h3>\n

\u662f\u591a\u79cd\u5f62\u6001，<\/span>\u5177\u4f53\u70b9\u5c31\u662f\u53bb\u5b8c\u6210\u67d0\u4e2a\u884c\u4e3a，\u5f53\u4e0d\u540c\u7684\u5bf9\u8c61\u53bb\u5b8c\u6210\u65f6\u4f1a\u4ea7\u751f\u51fa\u4e0d\u540c \u7684\u72b6 <\/span><\/p>\n

\u6001，\u6bd4\u5982：\u90fd\u662f\u5403\u996d，\u9e1f\u5403\u9e1f\u7cae，\u72d7\u5403\u72d7\u7cae，\u4eba\u5403\u996d…,<\/p>\n

2，\u4e3a\u4ec0\u4e48\u6709\u591a\u6001？<\/h3>\n

\u4ece\u4e00\u4e2a\u521d\u59cb\u8005\u7684\u89d2\u5ea6\u53bb\u770b，\u5c31\u662f\u4e3a\u4e86\u65b9\u4fbf，\u4e0b\u9762\u4f1a\u7528\u4ee3\u7801\u6765\u8bf4\u660e\u3002<\/p>\n

3，\u591a\u6001\u5b9e\u73b0\u6761\u4ef6<\/span><\/h3>\n

1. <\/span>\u5fc5\u987b\u5728\u7ee7\u627f\u4f53\u7cfb\u4e0b <\/span><\/p>\n

2. <\/span>\u5b50\u7c7b\u5fc5\u987b\u8981\u5bf9\u7236\u7c7b\u4e2d\u65b9\u6cd5\u8fdb\u884c<\/span>\u91cd\u5199 <\/span><\/p>\n

3. <\/span>\u901a\u8fc7\u7236\u7c7b\u7684\u5f15\u7528\u8c03\u7528\u91cd\u5199\u7684\u65b9\u6cd5<\/span><\/p>\n

\u6ce8\u610f：\u591a\u6001\u4f53\u73b0：\u5728\u4ee3\u7801\u8fd0\u884c\u65f6，\u5f53\u4f20\u9012\u4e0d\u540c\u7c7b\u5bf9\u8c61\u65f6，\u4f1a\u8c03\u7528\u5bf9\u5e94\u7c7b\u4e2d\u7684\u65b9\u6cd5\u3002<\/span><\/p>\n

\u200b
\npublic class Animal {
\nString name;
\nint age;
\npublic Animal(String name, int age){
\nthis.name = name;
\nthis.age = age;
\n}
\npublic void eat(){
\nSystem.out.println(name + "\u5403\u4e1c\u897f");
\n}
\n}
\npublic class Cat extends Animal{
\npublic Cat(String name, int age){
\nsuper(name, age);
\n}
\n@Override
\npublic void eat(){
\nSystem.out.println(name+"\u5403\u9c7c\u9975~~~");
\n}
\n}
\npublic class Dog extends Animal {
\npublic Dog(String name, int age){
\nsuper(name, age);
\n}
\n@Override
\npublic void eat(){
\nSystem.out.println(name+"\u5403\u72d7\u7cae~~~");
\n}
\n}<\/p>\n

\u200b<\/p>\n

public class TestAnimal {
\npublic static void eat(Animal a){
\na.eat();
\n}
\npublic static void main(String[] args) {
\nCat cat = new Cat("\u5c0f\u732b",2);
\nDog dog = new Dog("\u5c0f\u72d7", 1);
\neat(cat);
\neat(dog);
\n}
\n}<\/p>\n

\/\/ \u5bf9\u4e8eeat\u65b9\u6cd5，\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u4ee3\u7801\u65f6，\u5e76\u4e0d\u77e5\u9053\u8981\u8c03\u7528Dog \u8fd8\u662f Cat \u4e2deat\u7684\u65b9\u6cd5
\n\/\/ \u7b49\u7a0b\u5e8f\u8fd0\u884c\u8d77\u6765\u540e，\u5f62\u53c2a\u5f15\u7528\u7684\u5177\u4f53\u5bf9\u8c61\u786e\u5b9a\u540e，\u624d\u77e5\u9053\u8c03\u7528\u90a3\u4e2a\u65b9\u6cd5
\n\/\/ \u6ce8\u610f：\u6b64\u5904\u7684\u5f62\u53c2\u7c7b\u578b\u5fc5\u987b\u65f6\u7236\u7c7b\u7c7b\u578b\u624d\u53ef\u4ee5<\/p>\n

\u5982\u679c\u6ca1\u6709\u4f7f\u7528\u591a\u6001，\u6309\u7167\u4ee5\u524d\u7684\u5199\u6cd5\u5c31\u50cf\u4e0b\u9762\u4ee3\u7801，\u53ea\u80fd\u8bf4\u5404\u6709\u5343\u79cb<\/p>\n

class Test{
\n public static void main(String[] args) {
\n Cat cat1=new Cat("\u5c0f\u732b",1);
\n cat1.eat();
\n Dog dog1=new Dog("\u5c0f\u72d7",2);
\n dog1.eat();
\n }
\n}<\/p>\n

4，\u4ec0\u4e48\u662f\u91cd\u5199？<\/span><\/h3>\n

\u91cd\u5199\u662f\u5b50\u7c7b\u5bf9\u5df2\u7ecf\u5b58\u5728\u7684\u7236\u7c7b\u7684\u975e\u9759\u6001\u3001\u975e<\/span>private<\/span>\u4fee\u9970，\u975e<\/span>final<\/span>\u4fee\u9970，\u975e\u6784\u9020\u65b9\u6cd5\u7b49\u7684\u5b9e\u73b0\u8fc7\u7a0b <\/span><\/p>\n

\u8fdb\u884c\u91cd\u65b0\u7f16\u5199\u3002\u4e5f\u5c31\u662f\u8bf4\u5b50\u7c7b\u80fd\u591f\u6839\u636e\u9700\u8981\u901a\u8fc7\u91cd\u5199\u6765\u5b9e\u73b0\u7236\u7c7b\u7684\u65b9\u6cd5\u3002<\/span><\/p>\n

5，\u91cd\u5199\u89c4\u5219<\/h3>\n

1. \u65b9\u6cd5\u7b7e\u540d\u5fc5\u987b\u5b8c\u5168\u4e00\u81f4<\/h4>\n
    \n
  • \u65b9\u6cd5\u540d\u548c\u53c2\u6570\u5217\u8868（\u53c2\u6570\u6570\u91cf\u3001\u7c7b\u578b\u3001\u987a\u5e8f）\u5fc5\u987b\u4e0e\u7236\u7c7b\u65b9\u6cd5\u5b8c\u5168\u76f8\u540c\u3002\n
      \n
    • \n

      \u00a0\u9519\u8bef\u793a\u4f8b：\u7236\u7c7b\u65b9\u6cd5 void show（int a），\u5b50\u7c7b\u5199\u6210\u00a0void show（String a）（\u53c2\u6570\u7c7b\u578b\u4e0d\u540c，\u5c5e\u4e8e\u91cd\u8f7d\u800c\u975e\u91cd\u5199）\u3002<\/p>\n<\/li>\n

    • \u00a0\u6b63\u786e\u793a\u4f8b：\u7236\u7c7b int add(int x,int y)<\/font>，\u5b50\u7c7b\u91cd\u5199\u65f6\u4fdd\u6301\u00a0 int add(int x, int y)\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

      2. \u8bbf\u95ee\u6743\u9650\u4e0d\u80fd\u66f4\u4e25\u683c<\/h4>\n

      \u5b50\u7c7b\u91cd\u5199\u65b9\u6cd5\u7684\u8bbf\u95ee\u6743\u9650\u5fc5\u987b\u5927\u4e8e\u7b49\u4e8e\u7236\u7c7b\u65b9\u6cd5\u7684\u6743\u9650：<\/p>\n

        \n
      • \u7236\u7c7b\u65b9\u6cd5\u4e3a\u00a0public\u00a0\u2192 \u5b50\u7c7b\u53ea\u80fd\u662f\u00a0public（\u4e0d\u80fd\u662f\u00a0protected\u00a0\u6216\u00a0private）\u3002<\/li>\n
      • \u7236\u7c7b\u65b9\u6cd5\u4e3a\u00a0protected\u00a0\u2192 \u5b50\u7c7b\u53ef\u4ee5\u662f\u00a0protected\u00a0\u6216\u00a0public\u3002<\/li>\n
      • \u00a0\u9519\u8bef\u793a\u4f8b：\u7236\u7c7b\u00a0protected void test()，\u5b50\u7c7b\u5199\u6210\u00a0private void test()（\u6743\u9650\u66f4\u4e25\u683c）\u3002<\/li>\n<\/ul>\n

        3. \u8fd4\u56de\u503c\u7c7b\u578b\u9700\u6ee1\u8db3\u201c\u534f\u53d8\u201d<\/h4>\n
          \n
        • JDK 8\u53ca\u4e4b\u540e：\u5141\u8bb8\u8fd4\u56de\u7236\u7c7b\u8fd4\u56de\u503c\u7684\u5b50\u7c7b\u7c7b\u578b（\u534f\u53d8\u8fd4\u56de）\u3002\n
            \n
          • \u793a\u4f8b：\u7236\u7c7b\u65b9\u6cd5\u00a0Number getValue()，\u5b50\u7c7b\u53ef\u91cd\u5199\u4e3a\u00a0Integer getValue()（Integer\u00a0\u662f\u00a0Number\u00a0\u7684\u5b50\u7c7b）\u3002<\/li>\n
          • \u5728\u66f4\u65e9\u7684\u7f16\u8bd1\u5668\u4e2d，\u5f3a\u5236\u8981\u6c42\u540d\u5b57\u76f8\u540c\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

            4. \u5f02\u5e38\u58f0\u660e\u4e0d\u80fd\u6269\u5927\u8303\u56f4<\/h4>\n

            \u5b50\u7c7b\u91cd\u5199\u65b9\u6cd5\u629b\u51fa\u7684\u5f02\u5e38\u4e0d\u80fd\u6bd4\u7236\u7c7b\u65b9\u6cd5\u66f4\u5bbd\u6cdb<\/p>\n

            \u4f8b\u5982：\u5982\u679c\u7236\u7c7b\u65b9\u6cd5\u88ab<\/span>public<\/span>\u4fee\u9970，\u5219\u5b50\u7c7b\u4e2d\u91cd\u5199\u8be5\u65b9 \u6cd5\u5c31\u4e0d\u80fd\u58f0\u660e\u4e3a protected<\/span><\/p>\n

            5. \u7279\u6b8a\u4fee\u9970\u7b26\u7684\u9650\u5236<\/p>\n

              \n
            • static\u00a0\u65b9\u6cd5\u4e0d\u80fd\u91cd\u5199<\/li>\n
            • final\u00a0\u65b9\u6cd5\u4e0d\u80fd\u91cd\u5199<\/li>\n
            • private\u00a0\u65b9\u6cd5\u4e0d\u80fd\u91cd\u5199<\/li>\n<\/ul>\n

              6，\u52a8\u6001\u7ed1\u5b9a<\/h3>\n

              \u5728\u7f16\u8bd1\u7684\u65f6\u5019\u8fd8\u4e0d\u80fd\u786e\u5b9a\u662f\u8c01\u8c03\u7528\u4e86\u65b9\u6cd5，\u5728\u8fd0\u884c\u7684\u65f6\u5019\u624d\u77e5\u9053\u3002\u5982\u4e0b\u4ee3\u7801，\u5728\u7f16\u8bd1\u7684\u65f6\u5019\u8fd8\u4e0d\u77e5\u9053\u662f\u732b（cat）\u8fd8\u662f\u72d7（dog）\u8c03\u7528\u4e86\u4ee3\u7801，\u5230\u8fd0\u884c\u7684\u65f6\u5019\u624d\u77e5\u9053<\/p>\n

              public class TestAnimal {
              \npublic static void eat(Animal a){
              \na.eat();
              \n}
              \npublic static void main(String[] args) {
              \nCat cat = new Cat("\u5c0f\u732b",2);
              \nDog dog = new Dog("\u5c0f\u72d7", 1);
              \neat(cat);
              \neat(dog);
              \n}
              \n}<\/p>\n

              7，\u5411\u4e0a\u8f6c\u578b\u548c\u5411\u4e0b\u8f6c\u578b<\/span><\/h3>\n

              7.1，\u5411\u4e0a\u8f6c\u578b<\/span><\/h4>\n

              \u5b9e\u9645\u5c31\u662f\u521b\u5efa\u4e00\u4e2a\u5b50\u7c7b\u5bf9\u8c61，\u5c06\u5176\u5f53\u6210\u7236\u7c7b\u5bf9\u8c61\u6765\u4f7f\u7528<\/span><\/p>\n

              \u5411\u4e0a\u8f6c\u578b\u7684\u51e0\u79cd\u65b9\u6cd5：<\/span><\/p>\n

              1. <\/span>\u76f4\u63a5\u8d4b\u503c <\/span><\/p>\n

              \u200b
              \nclass Animal {
              \n eat();
              \n} \/\/ \u7236\u7c7b
              \nclass Cat extends Animal {
              \n eat();
              \n} \/\/ \u5b50\u7c7b<\/p>\n

              public class Test {
              \n public static void main(String[] args) {
              \n \/\/ \u5411\u4e0a\u8f6c\u578b：\u5b50\u7c7b\u5bf9\u8c61 \u2192 \u7236\u7c7b\u5f15\u7528
              \n Animal animal = new Cat();
              \n anima.eat();
              \n }
              \n}<\/p>\n

              \u200b<\/p>\n

              \u5173\u952e\u8bf4\u660e：<\/p>\n

                \n
              • animal<\/span>\u662f Animal<\/span>\u7c7b\u578b\u7684\u5f15\u7528，\u4f46\u6307\u5411\u7684\u662fCat\u00a0\u5bf9\u8c61（\u8fd0\u884c\u65f6\u7c7b\u578b\u4e3aCat）\u3002<\/li>\n
              • \u6b64\u65f6\u901a\u8fc7\u00a0animal<\/span>\u00a0\u53ea\u80fd\u8c03\u7528\u7236\u7c7bAnimal<\/span>\u4e2d\u5b9a\u4e49\u7684\u65b9\u6cd5（\u9664\u975e\u5b50\u7c7b\u91cd\u5199\u4e86\u8be5\u65b9\u6cd5，\u89e6\u53d1\u52a8\u6001\u7ed1\u5b9a）\u3002<\/li>\n<\/ul>\n

                2. <\/span>\u65b9\u6cd5\u4f20\u53c2<\/span><\/p>\n

                class Animal {
                \n void eat() { System.out.println("\u52a8\u7269\u5403\u4e1c\u897f"); }
                \n}
                \nclass Dog extends Animal {
                \n @Override
                \n void eat() { System.out.println("\u5c0f\u72d7\u5543\u9aa8\u5934"); }
                \n}<\/p>\n

                public class Test {
                \n \/\/ \u4f20\u53c2：\u65b9\u6cd5\u53c2\u6570\u4e3a\u7236\u7c7b\u7c7b\u578b
                \n public static void feed(Animal animal) {
                \n animal.eat(); \/\/ \u52a8\u6001\u7ed1\u5b9a：\u8c03\u7528\u5b50\u7c7b\u91cd\u5199\u7684\u65b9\u6cd5
                \n }<\/p>\n

                public static void main(String[] args) {
                \n Dog dog = new Dog();
                \n feed(dog); \/\/ \u4f20\u5165\u5b50\u7c7b\u5bf9\u8c61，\u81ea\u52a8\u5411\u4e0a\u8f6c\u578b\u4e3aAnimal\u7c7b\u578b
                \n }
                \n}<\/p>\n

                3. <\/span>\u65b9\u6cd5\u8fd4\u56de<\/span><\/p>\n

                public class TestAnimal {<\/p>\n

                \/\/ 3. \u4f5c\u8fd4\u56de\u503c：\u8fd4\u56de\u4efb\u610f\u5b50\u7c7b\u5bf9\u8c61
                \npublic static Animal buyAnimal(String var){
                \nif("\u72d7".equals(var) ){
                \nreturn new Dog("\u72d7\u72d7",1);
                \n}else if("\u732b" .equals(var)){
                \nreturn new Cat("\u732b\u732b", 1);
                \n}else{
                \nreturn null;
                \n}
                \n}<\/p>\n

                public static void main(String[] args) {<\/p>\n

                \/\/\u901a\u8fc7\u8fd4\u56de\u503c\u5f15\u7528
                \nAnimal animal = buyAnimal("\u72d7");
                \nanimal.eat();
                \nanimal = buyAnimal("\u732b");
                \nanimal.eat();
                \n}
                \n}<\/p>\n

                \u5411\u4e0a\u8f6c\u578b\u7684\u4f18\u70b9：\u8ba9\u4ee3\u7801\u5b9e\u73b0\u66f4\u7b80\u5355\u7075\u6d3b\u3002 <\/span><\/p>\n

                \u5411\u4e0a\u8f6c\u578b\u7684\u7f3a\u9677：\u4e0d\u80fd\u8c03\u7528\u5230\u5b50\u7c7b\u7279\u6709\u7684\u65b9\u6cd5\u3002<\/span><\/p>\n

                7.2，\u5411\u4e0b\u8f6c\u578b<\/span><\/h4>\n

                1.\u5c06\u4e00\u4e2a\u5b50\u7c7b\u5bf9\u8c61\u7ecf\u8fc7\u5411\u4e0a\u8f6c\u578b\u4e4b\u540e\u5f53\u6210\u7236\u7c7b\u65b9\u6cd5\u4f7f\u7528，\u518d\u65e0\u6cd5\u8c03\u7528\u5b50\u7c7b\u7684\u65b9\u6cd5，\u4f46\u6709\u65f6\u5019\u53ef\u80fd\u9700\u8981\u8c03\u7528\u5b50\u7c7b\u7279\u6709\u7684 \u65b9\u6cd5，\u6b64\u65f6：\u5c06\u7236\u7c7b\u5f15\u7528\u518d\u8fd8\u539f\u4e3a\u5b50\u7c7b\u5bf9\u8c61\u5373\u53ef，\u5373\u5411\u4e0b\u8f6c\u6362\u3002<\/span><\/p>\n

                2.\u5411\u4e0b\u8f6c\u578b\u7528\u7684\u6bd4\u8f83\u5c11，\u800c\u4e14\u4e0d\u5b89\u5168，\u4e07\u4e00\u8f6c\u6362\u5931\u8d25，\u8fd0\u884c\u65f6\u5c31\u4f1a\u629b\u5f02\u5e38\u3002<\/span>Java<\/span>\u4e2d\u4e3a\u4e86\u63d0\u9ad8\u5411\u4e0b\u8f6c\u578b\u7684\u5b89\u5168\u6027，\u5f15\u5165 \u4e86 instanceof <\/span>，\u5982\u679c\u8be5\u8868\u8fbe\u5f0f\u4e3a<\/span>true<\/span>，\u5219\u53ef\u4ee5\u5b89\u5168\u8f6c\u6362\u3002<\/span><\/p>\n

                public class TestAnimal {
                \npublic static void main(String[] args) {
                \nCat cat = new Cat("\u5143\u5b9d",2);
                \nDog dog = new Dog("\u5c0f\u4e03", 1);
                \n\/\/ \u5411\u4e0a\u8f6c\u578b
                \nAnimal animal = cat;
                \nanimal.eat();
                \nanimal = dog;
                \nanimal.eat();
                \nif(animal instanceof Cat){
                \ncat = (Cat)animal;
                \ncat.mew();
                \n}
                \nif(animal instanceof Dog){
                \ndog = (Dog)animal;
                \ndog.bark();
                \n}
                \n}
                \n}<\/p>\n

                8，\u591a\u6001\u7684\u4f18\u70b9<\/span><\/h3>\n

                \u5982\u00a0 \u4e0b\u4ee3\u7801，\u867d\u7136\u901a\u8fc7\u5faa\u73af\u80fd\u591f\u8fbe\u5230\u76ee\u7684，\u4f46\u662f\u5982\u679c\u6253\u5370\u7684\u79cd\u7c7b\u975e\u5e38\u591a，\u8fc7\u7a0b\u5219\u975e\u5e38\u4f4e\u6548<\/p>\n

                \u200b
                \nclass Shape {
                \n\/\/\u5c5e\u6027….
                \npublic void draw() {
                \nSystem.out.println("\u753b\u56fe\u5f62！");
                \n}
                \n}<\/p>\n

                \/\/\u5982\u679c\u8fd8\u8981\u6253\u5370\u5176\u4ed6\u7684\u56fe\u5f62，\u5c31\u8981\u91cd\u590d\u6b64\u7ee7\u627f\u6b65\u9aa4，\u5728\u901a\u8fc7main\u65b9\u6cd5\u6765\u6ce8\u610f\u5b9e\u4f8b\u5316\u5b9e\u73b0
                \nclass Rect extends Shape{
                \n@Override
                \npublic void draw() {
                \nSystem.out.println("\u2666");
                \n}
                \n}<\/p>\n

                class Cycle extends Shape{
                \n@Override
                \npublic void draw() {
                \nSystem.out.println("\u25cf");
                \n}
                \n}<\/p>\n

                public static void drawShapes() {
                \nRect rect = new Rect();
                \nCycle cycle = new Cycle();<\/p>\n

                String[] shapes = {"cycle", "rect", "cycle"};<\/p>\n

                for (String shape : shapes) {
                \nif (shape.equals("cycle")) {
                \ncycle.draw();
                \n} else if (shape.equals("rect")) {
                \nrect.draw();
                \n}
                \n}
                \n}<\/p>\n

                \u5982\u679c\u5229\u7528\u591a\u6001，\u4e0d\u7528\u8fc7\u591a\u7684if\u5faa\u73af，\u5219\u975e\u5e38\u9ad8\u6548<\/p>\n

                \u200b
                \npublic static void drawShapes() {
                \n\/\/ \u521b\u5efa\u4e86\u4e00\u4e2a Shape \u5bf9\u8c61\u7684\u6570\u7ec4.
                \nShape[] shapes = {new Cycle(), new Rect(), new Cycle(),
                \nnew Rect()};
                \nfor (Shape shape : shapes) {
                \nshape.draw();
                \n}
                \n}<\/p>\n

                \u200b<\/p>\n

                9，\u591a\u6001<\/span>\u7f3a\u9677<\/span>：\u4ee3\u7801\u7684\u8fd0\u884c\u6548\u7387\u964d\u4f4e<\/span>\u3002 <\/span><\/h3>\n

                1. <\/span>\u5c5e\u6027\u6ca1\u6709\u591a\u6001\u6027 <\/span><\/p>\n

                \u5f53\u7236\u7c7b\u548c\u5b50\u7c7b\u90fd\u6709\u540c\u540d\u5c5e\u6027\u7684\u65f6\u5019，\u901a\u8fc7\u7236\u7c7b\u5f15\u7528，\u53ea\u80fd\u5f15\u7528\u7236\u7c7b\u81ea\u5df1\u7684\u6210\u5458\u5c5e\u6027 <\/span><\/p>\n

                2. <\/span>\u6784\u9020\u65b9\u6cd5\u6ca1\u6709\u591a\u6001\u6027<\/span><\/p>\n

                class B {
                \npublic B() {
                \n\/\/ do nothing
                \nfunc();
                \n}
                \npublic void func() {
                \nSystem.out.println("B.func()");
                \n}
                \n}
                \nclass D extends B {
                \nprivate int num = 1;
                \n@Override
                \npublic void func() {
                \nSystem.out.println("D.func() " + num);
                \n}
                \n}
                \npublic class Test {
                \npublic static void main(String[] args) {
                \nD d = new D();
                \n}
                \n}
                \n\/\/ \u6267\u884c\u7ed3\u679c
                \nD.func() 0<\/p>\n

                \u6267\u884c\u987a\u5e8f：<\/p>\n

                \u6784\u9020<\/span> D <\/span>\u5bf9\u8c61\u7684\u540c\u65f6<\/span>, <\/span>\u4f1a\u8c03\u7528<\/span> B <\/span>\u7684\u6784\u9020\u65b9\u6cd5<\/span>. <\/span><\/p>\n

                B <\/span>\u7684\u6784\u9020\u65b9\u6cd5\u4e2d\u8c03\u7528\u4e86<\/span> func <\/span>\u65b9\u6cd5<\/span>, <\/span>\u6b64\u65f6\u4f1a\u89e6\u53d1\u52a8\u6001\u7ed1\u5b9a<\/span>, <\/span>\u4f1a\u8c03\u7528\u5230<\/span> D <\/span>\u4e2d\u7684<\/span> func <\/span><\/p>\n

                \u6b64\u65f6<\/span> D <\/span>\u5bf9\u8c61\u81ea\u8eab\u8fd8\u6ca1\u6709\u6784\u9020<\/span>, <\/span>\u6b64\u65f6<\/span> num <\/span>\u5904\u5728\u672a\u521d\u59cb\u5316\u7684\u72b6\u6001<\/span>, <\/span>\u503c\u4e3a<\/span> 0.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

                1，\u4ec0\u4e48\u662f\u591a\u6001？\u662f\u591a\u79cd\u5f62\u6001，\u5177\u4f53\u70b9\u5c31\u662f\u53bb\u5b8c\u6210\u67d0\u4e2a\u884c\u4e3a，\u5f53\u4e0d\u540c\u7684\u5bf9\u8c61\u53bb\u5b8c\u6210\u65f6\u4f1a\u4ea7\u751f\u51fa\u4e0d\u540c \u7684\u72b6 \u6001，\u6bd4\u5982：\u90fd\u662f\u5403\u996d，\u9e1f\u5403\u9e1f\u7cae，\u72d7\u5403\u72d7\u7cae，\u4eba\u5403\u996d…,2，\u4e3a\u4ec0\u4e48\u6709\u591a\u6001？\u4ece\u4e00\u4e2a\u521d\u59cb\u8005\u7684\u89d2\u5ea6\u53bb\u770b，\u5c31\u662f\u4e3a\u4e86\u65b9\u4fbf，\u4e0b\u9762\u4f1a\u7528\u4ee3\u7801\u6765\u8bf4\u660e\u30023，\u591a\u6001\u5b9e\u73b0\u6761\u4ef61. \u5fc5\u987b\u5728\u7ee7\u627f\u4f53\u7cfb\u4e0b 2. \u5b50\u7c7b\u5fc5\u987b\u8981\u5bf9\u7236<\/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-76190","post","type-post","status-publish","format-standard","hentry","category-server","tag-java","tag-190"],"yoast_head":"\n\u6ce8\u610f\uff1a\u591a\u6001\u4e0d\u662f\u201c\u591a\u53d8\u6001\u201d - 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