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java - the Java application launcher
SYNOPSIS
    java [ options ] class [ argument ... ]
    java [ options ] -jar file.jar [ argument ... ]
    javaw [ options ] class [ argument ... ]
    javaw [ options ] -jar file.jar [ argument ... ]

options
Command-line options.
class
Name of the class to be invoked.
file.jar
Name of the jar file to be invoked. Used only with -jar.
argument
Argument passed to the main function.

DESCRIPTION
The java tool launches a Java application. It does this by starting a Java runtime environment, loading a specified class, and invoking that class's main method.
The method must be declared public and static, it must not return any value, and it must accept a String array as a para meter. The method declaration must look like the following:

    public static void main(String args[])

By default, the first non-option argument is the name of the class to be invoked. A fully-qualified class name should be used. If the -jar option is specified, the first non-option argume nt is the name of a JAR archive containing class and resource f iles for the application, with the startup class indicated by the Main-Class manifest header.
The Java runtime searches for the startup class, and other classes used, in three sets of locations: the bootstrap class path, the installed extensions, and the user class path.

Non-option arguments after the class name or JAR file name are passed to the main function.

The javaw command is identical to java, except that with javaw there is no associated console window. Use javaw when you don't want a command prompt window to appear. The javaw launcher will, however, display a dialog box with error information if a launch fails for some reason.

OPTIONS
The launcher has a set of standard options that are supported on the current runtime environment and will be supported in future releases. In addition, the default Java HotSpot VMs provide a set of non-standard options that are subject to change in future releases.
Standard Options//只把目前用到的加上了
-classpath classpath
-cp classpath
Specify a list of directories, JAR archives, and ZIP archives to search for class files. Class path entries are separated by semicolons (;). Specifying -classpath or -cp overrides any setting of the CLASSPATH environment variable.
If -classpath and -cp are not used and CLASSPATH is not set, the user class path consists of the current directory (.).

For more information on class paths, see Setting the Class Path.