A key feature of Java is "Wora" (WORA), the promise of a program that was developed on a computer system can run similarly on other, not necessarily compatible computer systems. Java also promises to be "simple and familiar object-oriented", "robust and secure", "interpreted, threaded, and dynamic", and execute with "high performance". While all of these features are important, WORA distinguishes Java most other programming languages.
Java offers standardized libraries that enable programmers to access specific features such as graphics and network to target computers. In other words, if you want to run Java on a Windows computer you access program libraries that handle the details of communicating with the Windows graphics system.
Java has been accused of poor performance. To deal with this problem Java programs may generate output known as Java bytecode that runs on a Java Virtual Machine. In theory the Java programmer need not be familiar with how Java bytecode works, but some feel that programmer understanding of Java bytecode improves the final product. You can still run Java on Windows (I do but I am not a Java programmer) but access to the full suite of Java products is not a 1-2-3 operation.
The Java version of Hello, world appears below:
// HelloWorld.java
HelloWorld {public class
main (args String []) {public static void
System.out.println ( "Hello, world!");
}
}
However, the version of the C language program contains only 4 lines. XWindow is the Unix and Linux windows. Java applets are programs embedded in other applications, typically in a Web page displayed in a Web browser. Java servlets are similar to Java applets but run on the Web server. While Javascript is a popular easy to use language for writing scripts (small programs) on the client computer are not really related to the Java programming language.
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