abstract classPerson{String name;int age;void introduce(){System.out.println("我的名字是"+ name +"，我的年龄是"+ age);} abstract void eat();}classChinese extends Person{//Person中eat的复写void eat(){System.out.println("用筷子吃饭");}}classTest{publicstaticvoid main(String args []){//向上转型Person p =newChinese(); p.eat();}}原文：http://www.cnblogs.com/arroneve/p/5815444.html