NITT2--JAVA2018/3/8

package CHAP1;

public class Login {
    
    private String username="admin";
    private String password="123456";
    //相当于login成员
    //ValidateCredentials验证类(Login的内部类)
    /*static*/    class ValidateCredentials{
        public void validate() {
            if(username.equals("admin") && (password.equals("123456"))) {
                System.out.println("登录成功！");
                
            }
        }
    }
}
    //定义测试类
    //静态方法类名调用,实例方法对象调用
class test {
    public static void main(String[] args) {
            Login l=new Login();//先创建外部类对象
            //再用外部类创建内部类的对象
            Login.ValidateCredentials v=new Login().new ValidateCredentials();
    //        Login.ValidateCredentials  v=new Login.ValidateCredentials();
            v.validate();
        }
}

                         

方法局部内部類：
為：

package CHAP1;

public class Login {
    
    private String username="admin";
    private String password="123456";
    //方法局部内部類：
    void Validating () {
        int i=0;
    //相当于login成员
    //ValidateCredentials验证类(Login的内部类)
    /*static*/    class ValidateCredentials{
        public void validate() {
            //Login l=new Login();
            if(username.equals("admin") && (password.equals("123456"))) {
                System.out.println("登录成功！");
                
            }
        }
        ValidateCredentials v=new  ValidateCredentials();
        v.validate();
    }}
    
}
    //定义测试类
    //静态方法类名调用,实例方法对象调用
class test {
    public static void main(String[] args) {
            Login l=new Login();//先创建外部类对象
            //再用外部类创建内部类的对象
    //        Login.ValidateCredentials v=new Login().new ValidateCredentials();
        //    Login.ValidateCredentials  v=new Login.ValidateCredentials();
            v.validate();
        }
}