Class and object initialization in Java

Classes and objects in Java must be initialized before they are used. You’ve previously learned that class fields are initialized to default values when classes are loaded and that objects are initialized via constructors, but there is more to initialization. This article introduces all of Java’s features for initializing classes and objects.

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Download the source code for example applications in this tutorial. Created by Jeff Friesen for JavaWorld.

How to initialize a Java class

Before we explore Java’s support for class initialization, let’s recap the steps of initializing a Java class. Consider Listing 1.

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