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Chapter: Java The Complete Reference : The Java Language : An Overview of Java

The Java Class Libraries

The sample programs shown in this chapter make use of two of Java’s built-in methods: println( ) and print( ).

The Java Class Libraries

 

The sample programs shown in this chapter make use of two of Java’s built-in methods: println( ) and print( ). As mentioned, these methods are available through System.out. System is a class predefined by Java that is automatically included in your programs. In the larger view, the Java environment relies on several built-in class libraries that contain many built-in methods that provide support for such things as I/O, string handling, networking, and graphics. The standard classes also provide support for a graphical user interface (GUI). Thus, Java as a totality is a combination of the Java language itself, plus its standard classes. As you will see, the class libraries provide much of the functionality that comes with Java. Indeed, part of becoming a Java programmer is learning to use the standard Java classes. Throughout Part I of this book, various elements of the standard library classes and methods are described as needed. In Part II, several class libraries are described in detail.

 

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