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double equal sign vs equals() method

Nick Petas
Ranch Hand

Joined: Jan 31, 2007
Posts: 38
When I compare two objects which of the two ways I must choose?
Thank you very much!
Campbell Ritchie

Joined: Oct 13, 2005
Posts: 37936
== 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: 1 2 3 4. And there will be many others.
It is sorta covered in the JavaRanch Style Guide.
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