This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
== tells you whether they are both the same object. equals() tells you that they satisfy whatever criteria that class has to be regarded as equal. If the API documentation for your class has "equals" under "methods inherited from Object" then it simply uses == to see whether both Objects are the same object. Look at a few other threads which might help: 1234. And there will be many others.