messj的专栏

http://www.programcreek.com/2011/07/java-equals-and-hashcode-contract/ The Java super class java.lang.Object has two very important methods defined: public boolean equals(Object ob

转自：http://www.programcreek.com/2013/09/string-is-passed-by-reference-in-java/ 先看String的不变性可以更好的理解文章内容，String的不变性网址为：http://www.programcreek.com/2009/02/diagram-to-show-java-strings-immutability/

http://www.programcreek.com/2013/12/what-exactly-is-null-in-java/ Let’s start from the following statement: String x = null; 1. What exactly does this statement do? Rec