摘要： package 第十二次; public abstract class Person { private String name; private int age; public String getName() { return name; } public void setName(String 阅读全文

摘要： class A{ private B b = null ; public void fun() { this.b = new B(this); this.b.fun() ; } public void print() { System.out.println("Hello World!!!"); } }; c... 阅读全文