java中匿名类的注意细节

abstract class Outer{
    int num;
    public Outer(int x){
        num = x;
    }
    public abstract void show1();
     
    public abstract void show2();
}
 
public class PC{
    public static void main(String[] args){
       new Outer(55)//构造父类部分
       //子类重写部分
       {
            public void show1(){
               System.out.println(num++);
            }
             
            public void show2(){
               System.out.println(num++);
            }
             
            public void show3(){
               System.out.println(num++);
            }
        }.show3();
         
         
        Outer out =  new Outer(55){
            public void show1(){
               System.out.println(num++);
            }
             
            public void show2(){
               System.out.println(num++);
            }
             
            public void show3(){
               System.out.println(num++);
            }
        };
         
        out.show1();
        out.show2();
        //out.show3();// 错误: 找不到符号  out.show3();
         
        //注意： 第一个 new Outer(55) 得到是 Outer 的子类对象！
        //第二个 new Outer(55)得到子类对象之后又进行了类型提升， 所以它会隐藏自身特有的方法，呈现其父类的属性！
    }
}