内部类

内部类

• 静态内部类

class StaticOuter { 

private int a = 1;  
private static int b = 2;

public static void test() {

    System.out.println("Outer static test ...");  
}  

public  void test2(){ 

    System.out.println("Outer instabce test ...");  
}     
  
    static class StaticInner {
    
        public  int a = 200;  
        static int b =300;  
        
        public static void test(){  
            System.out.println("Inner static test ...");  
        }  
        
        public  void test2(){  
        
            System.out.println("Inner instance test ...");  
            StaticOuter.test();  
            new StaticOuter().test2();  
            System.out.println("StaticOuter.b  = "+StaticOuter.b);  
        }     
    }  
} 

• 成员内部类

class MemberOuter{  
      
    private String s1 = "Outer InstanceMar";  
    private String s2 = "OuterStatic s2";  
    public void setS1(String s1) {  
        this.s1 = s1; 
        
        new MemberOuter().new MemberInner();  
        this.new MemberInner();  
    }
  
  
    class MemberInner{  
    
        String s1= "Inner  instanceMae  ";  
        static final String s4 = "static final  MemberInner";  
              
                void test2() {  
                    System.out.println("s2 = "+s2);  
                }  
    }  
      
} 

• 匿名内部类

interface Action {

    public void do();  
} 

class Person { 

    public void user(Action pen) {  
        pen.do();  
    }  
} 
  
public class AnyInnerClass { 

    public static void main(String args[]) {  
    
        Person p = new Person();  
          
        p.user(new Pen() { 
        
            @Override  
            public void write() {
            
            }  
        });  
    }  
  
}