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http://www.cnblogs.com/lwbqqyumidi/p/3837629.html
http://blog.csdn.net/jinuxwu/article/details/6771121
http://bbs.csdn.net/topics/390171178
class Fruit{ public String toString(){ return "Fruit"; } } class Apple extends Fruit{ public String toString(){ return "Apple"; } } class Person{ public String toString(){ return "Person"; } }
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原文地址：http://www.cnblogs.com/xiaozhuan/p/5216524.html
