java面向对象（5）

class Outer
{
    private int x = 3;    
    class Inner//内部类
    {
        //int x = 4;
        void function()
        {
            //int x = 6;
            System.out.println("innner :"+x);
            System.out.println("innner :"+this.x);
            System.out.println("innner :"+Outer.this.x);
        }
    }
    /**/
    void method()
    {
        Inner in = new Inner();
        in.function();
    }
}

class  InnerClassDemo
{
    public static void main(String[] args)
    {
        Outer out = new Outer();
        out.method();
        //直接访问内部类中的成员。
        Outer.Inner in = new Outer().new Inner();
        in.function();
    }
}

class Outer
{
    private static  int x = 3;    
    static class Inner//静态内部类
    {
        static void function()
        {
            System.out.println("innner :"+x);
        }
    }

    static class Inner2
    {
        void show()
        {
            System.out.println("inner2 show");
        }
    }

    public static void method()
    {
        //Inner.function();
        new Inner2().show();
    }

}

class  InnerClassDemo2
{
    public static void main(String[] args)
    {
        Outer.method();
        Outer.Inner.function();
        new Outer.Inner().function();
    }
}

class Outer
{
    int x = 3;

    void method(final int a)
    {
        final int y = 4;
        class Inner
        {
            void function()
            {
                System.out.println(y);
            }
        }   
        new Inner().function();
        
    }
}

class  InnerClassDemo3
{
    public static void main(String[] args)
    {
        Outer out = new Outer();
        out.method(7);
        out.method(8);
    }

}

abstract class AbsDemo
{
    abstract void show();
    
}

class Outer
{
    int x = 3;
    /*
    class Inner extends AbsDemo
    {
        int num = 90;
        void show()
        {
            System.out.println("show :"+num);
        }
        void abc()
        {
            System.out.println("hehe");
        }
    }
    */

    public void function()
    {
        //AbsDemo a = new Inner();
//        Inner in = new Inner();
//        in.show();
//        in.abc();
    
        new AbsDemo()
        {
            int num = 9;
            void show()
            {
                System.out.println("num==="+num);
            }
            void abc()
            {
                System.out.println("haha");
            }
        }.show();

        new AbsDemo()
        {
            int num = 9;
            void show()
            {
                System.out.println("num==="+num);
            }
            void abc()
            {
                System.out.println("haha");
            }
        }.abc();
        
        AbsDemo d=new AbsDemo()
        {
            int num = 9;
            void show()
            {
                System.out.println("num==="+num);
            }
            void abc()
            {
                System.out.println("haha");
            }
        };
        d.show();
        //d.abc();//编译失败;
    }
}

class ExtendsDemo3
{
    public static void main(String[] args)
    {
        new Outer().function();
    }
    
}

interface Inter
{
    void method();
}
class Test
{
    //补足代码。通过匿名内部类。
    /*
    static class Inner implements Inter
    {
        public void method()
        {
            System.out.println("method run");
        }
    }
    */
    static Inter function()
    {
        return new Inter()
        {
            public void method()
            {
                System.out.println("method run");
            }
        };
    }

}

class InnerClassTest
{
    public static void main(String[] args)
    {
        //Test.function():Test类中有一个静态的方法function。
        //.method():function这个方法运算后的结果是一个对象。而且是一个Inter类型的对象。
        //因为只有是Inter类型的对象，才可以调用method方法。
        Test.function().method();
//        Inter in = Test.function();
//        in.method();
    }
}