hashCode and equals

Working with hashCode and equals methods in java

The 3 things you should know about hashCode()

Java’s hashCode is not safe for distributed systems

Hash Collision Probabilities

Java equals() and hashCode() Contract

What is HashCode

Deep in hashCode()

http://www.coderanch.com/t/658385/java/java/hashcode

http://blog.csdn.net/fenglibing/article/details/8905007

http://www.bysocket.com/?p=263

http://stackoverflow.com/questions/3563847/what-is-the-use-of-hashcode-in-java