The more familiar you are with Object and its methods, the more you can do with your Java programs.

What is the contract between equals() and hashcode()? Learn how these methods work together when comparing objects in Java.

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.