摘要：
package sy; public abstract class Person { private String name; private int age; public String getName() { return name; } public void setName(String name) { this.... 阅读全文
摘要：
package cn.ch.w; public abstract class A { public abstract void fun(); } package cn.ch.w; public class B extends A{ public void fun(){ System.out.println("嗨！你好小蘑菇！！"); } }... 阅读全文