equals() and hashCode() : equals method « Utility Classes « SCJP

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SCJP » Utility Classes » equals method 
8.2.1.equals() and hashCode()
Use == to determine if two reference variables refer to the same object.

Use equals() to determine if two objects are meaningfully equivalent.

If x.equals(yis true, then x.hashCode() == y.hashCode() is true.

If you override equals(), override hashCode().
8.2.equals method
8.2.1.equals() and hashCode()
8.2.2.The signature of equals() from Object class is 'public boolean equals(Object object)'
8.2.3.Implementing an equals() Method
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