(The rule in Java is that a source file may contain only one public class definition.) The files containing these classes’ definitions must be named ClassName.java where ClassName is the name of the public Java class contained in the file.įor example, in the case of our HelloWorld application program, the file must be named HelloWorld.java, and for HelloWorldSwing, it must be named HelloWorldSwing.java. We will follow the convention of placing each class definition in its own file. However, free macOS editors include TextMate and TextWrangler, and Windows has Notepad++ for free.Īs we have seen, a Java program consists of one or more class definitions. These editors are also available on macOS and Windows. Popular Unix and Linux editors include vim and emacs. If you are using some other environment, you will need to read the documentation provided with the software to determine exactly how to edit, compile, and run Java programs in that environment.Īny text editor may be used to edit the program by merely typing the program and making corrections as needed. That you are using the Java SE as your development environment to edit, compile and run the example program. Each of these provides a complete development package for editing, compiling, and running Java applications on a variety of platforms, including Linux, macOS, and Windows.įigure illustrates the process involved in creating and running a Java program. Some examples include Eclipse, jGrasp, and Oracle’s own NetBeans IDE. In some cases, the individual programs that make up the Java SE are available in a single program development environment, known as an integrated development environment (IDE). (For more details about the Java SE, see Appendix. Free downloads are available at Sun’s Web site at. Versions of Java SE are available for various platforms, including Linux, Windows, and macOS computers. It is currently known as the Java Platform, Standard Edition 8.0 (Java SE 8). The following description will be based on the software development environment provided by Oracle, the company that owns and maintains Java. \)Ī Java programming environment typically consists of several programs that perform different tasks required to edit, compile, and run a Java program.
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