public class Orc {
          public static class A        {
                 public String toString()               {
                        return "this is A";               }        }        public static void main(String[] args)        {
                 A obj = new A();               System.out.println(obj);        } }

 

如果某个方法里面有如下句子： 

 

A obj=new A();

 

System.out.println(obj);

 

会得到输出:this is A