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What Is Java, and Why Is It So Great?

if you have any experience with C or C++, you'll find yourself in familiar territory often as you learn the various features of Java

Platform independence:

One of the main reasons Java is so popular is its platform independence, which means that Java programs can be run on many different types of computers. A Java program runs on any computer with a Java Runtime Environment, also known as a JRE, installed. A JRE is available for almost every type of computer — PCs running Windows, Macintosh computers, Unix or Linux computers, huge mainframe computers, and even cell phones.

Object orientation:

Java is inherently object-oriented, which means that Java programs are made up of programming elements called objects. Simply put, an object is a programming entity that represents either some real-world object or an abstract concept.

The Java API:

The Java language itself is very simple. However, Java comes with a library of classes that provide commonly used utility functions that most Java programs can't do without. This class library, called the Java API, is as much a part of Java as the language itself. In fact, the real challenge of learning how to use Java isn't learning the language; it's learning the API. The Java language has only 50 keywords, but the Java API has several thousand classes — with tens of thousands of methods you can use in your programs.

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