java 内部类测试

Java代码
public class OuterInnerTest  
{  
    public static void main(String[] args)  
    {  
        //1  
        Outer outer = new Outer();  
        outer.show();  
          
        //2  
        Outer.Inner inner = outer.getInner();  
        inner.show();  
          
        //3  
        Outer.Inner inner2 = outer.new Inner();  
        inner2.show();  
    }  
}  
 
class Outer  
{  
    private int i = 3;  
      
    class Inner  
    {  
        private int i = 6;  
          
        public void show()  
        {  
            int i = 9;  
              
            System.out.println(i);  
            System.out.println(this.i);  
            System.out.println(Outer.this.i);  
        }  
    }  
      
    public void show()  
    {  
        Inner inner = new Inner();  
        inner.show();  
    }  
      
    public Inner getInner()  
    {  
        return new Inner();  
    }  
} 

public class OuterInnerTest
{
public static void main(String[] args)
{
//1
Outer outer = new Outer();
outer.show();

//2
Outer.Inner inner = outer.getInner();
inner.show();

//3
Outer.Inner inner2 = outer.new Inner();
inner2.show();
}
}

class Outer
{
private int i = 3;

class Inner
{
private int i = 6;

public void show()
{
int i = 9;

System.out.println(i);
System.out.println(this.i);
System.out.println(Outer.this.i);
}
}

public void show()
{
Inner inner = new Inner();
inner.show();
}

public Inner getInner()
{
return new Inner();
}
}



输出为：

Java代码
9 
6 
3 

9
6
3



如下：

Java代码
public class OuterInnerTest2   
{  
    private int i = 3;  
      
    public static void main(String[] args)  
    {  
        OuterInnerTest2 oit = new OuterInnerTest2();  
        oit.show(12);  
    }  
      
    public void show(final int n)  
    {  
        class Inner  
        {  
            private int i = 6;  
              
            public void show()  
            {  
                int i = 9;  
                  
                System.out.println(i);  
                System.out.println(this.i);  
                System.out.println(OuterInnerTest2.this.i);  
                System.out.println(n);//n必须为final类型的  
            }  
        }  
          
        Inner inner = new Inner();  
        inner.show();  
    }  
} 

public class OuterInnerTest2
{
private int i = 3;

public static void main(String[] args)
{
OuterInnerTest2 oit = new OuterInnerTest2();
oit.show(12);
}

public void show(final int n)
{
class Inner
{
private int i = 6;

public void show()
{
int i = 9;

System.out.println(i);
System.out.println(this.i);
System.out.println(OuterInnerTest2.this.i);
System.out.println(n);//n必须为final类型的
}
}

Inner inner = new Inner();
inner.show();
}
}

输出为：

Java代码
9 
6 
3 
12