Java Equals

equals

 * http://community.jboss.org/wiki/EqualsandHashCode
 * http://www.angelikalanger.com/Articles/JavaSolutions/SecretsOfEquals/Equals.html
 * http://hanuska.blogspot.com/2006/08/tricky-instanceof-operator.html
 * http://www.javapractices.com/topic/TopicAction.do?Id=17
 * http://www.ibm.com/developerworks/java/library/j-jtp05273.html
 * http://www.vipan.com/htdocs/hashcode_help.html

hashcode

 * http://stackoverflow.com/questions/113511/hash-code-implementation