In source-file mode, the java command can launch a class declared in a source file.īy default, the first argument that isn’t an option of the java command is the fully qualified name of the class to be called. The method declaration has the following form: class HelloWorld The method must be declared public and static, it must not return any value, and it must accept a String array as a parameter. It does this by starting the Java Runtime Environment, loading the specified class, and calling that class's main() method. The java command starts a Java application. Optional: Arguments following mainclass, source-file, -jar jarfile, and -m or -module module/mainclass are passed as arguments to the main class. Specifies the source file that contains the main class when using source-file mode. Only used to launch a single source-file program. In other words, mainclass can be used when it is not specified by the module, or to override the value when it is specified. If you’re using JAR files, then see jar command.Įxecutes the main class in a module specified by mainclass if it is given, or, if it is not given, the value in the module. When you use -jar, the specified JAR file is the source of all user classes, and other class path settings are ignored.
That defines the class with the public static void main(String args) method that serves as your application's starting point. The jarfile argument is the name of a JAR file with a manifest that contains a line in the form Main-Class:classname Command-line entries following classname are the arguments for the main method.Įxecutes a program encapsulated in a JAR file. Specifies the name of the class to be launched. Optional: Specifies command-line options separated by spaces. To launch a single source-file program: java source-file
To launch the main class in a module: java -m module To launch the main class in a JAR file: java -jar jarfile The javaw launcher will, however, display a dialog box with error information if a launch fails. Use javaw when you don’t want a command prompt window to appear. Windows: The javaw command is identical to java, except that with javaw there’s no associated console window.
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