NITT2--JAVA2018/3/8

 1 package CHAP1;
 2 
 3 public class Login {
 4     
 5     private String username="admin";
 6     private String password="123456";
 7     //相当于login成员
 8     //ValidateCredentials验证类(Login的内部类)
 9     /*static*/    class ValidateCredentials{
10         public void validate() {
11             if(username.equals("admin") && (password.equals("123456"))) {
12                 System.out.println("登录成功！");
13                 
14             }
15         }
16     }
17 }
18     //定义测试类
19     //静态方法类名调用,实例方法对象调用
20 class test {
21     public static void main(String[] args) {
22             Login l=new Login();//先创建外部类对象
23             //再用外部类创建内部类的对象
24             Login.ValidateCredentials v=new Login().new ValidateCredentials();
25     //        Login.ValidateCredentials  v=new Login.ValidateCredentials();
26             v.validate();
27         }
28 }
29 
30

方法局部内部類：
為：

 1 package CHAP1;
 2 
 3 public class Login {
 4     
 5     private String username="admin";
 6     private String password="123456";
 7     //方法局部内部類：
 8     void Validating () {
 9         int i=0;
10     //相当于login成员
11     //ValidateCredentials验证类(Login的内部类)
12     /*static*/    class ValidateCredentials{
13         public void validate() {
14             //Login l=new Login();
15             if(username.equals("admin") && (password.equals("123456"))) {
16                 System.out.println("登录成功！");
17                 
18             }
19         }
20         ValidateCredentials v=new  ValidateCredentials();
21         v.validate();
22     }}
23     
24 }
25     //定义测试类
26     //静态方法类名调用,实例方法对象调用
27 class test {
28     public static void main(String[] args) {
29             Login l=new Login();//先创建外部类对象
30             //再用外部类创建内部类的对象
31     //        Login.ValidateCredentials v=new Login().new ValidateCredentials();
32         //    Login.ValidateCredentials  v=new Login.ValidateCredentials();
33             v.validate();
34         }
35 }
36 
37