Here's how to make classes, fields, methods, constructors, and objects work together in your Java programs.

This method is used by hash-based Java collection classes, such as the java.util package’s HashMap, HashSet, and Hashtable classes to ensure that objects are properly stored and retrieved.

In Java, objects are passed by reference, and all methods are virtual, so object slicing will not occur inadvertently. Even if you upcast an object, its real type is not forgotten, that's the ...

Reference objects aren't just useful when memory is at a premium; they can also be used to provide slick caching abilities to any application.

Learn how Remote Method Invocation (RMI), an application programming interface for Java, preserves the object model and its advantages across a network.