set PATH=YOUR_INSTALL_ DIR\bin; C:\Windows;C:\Windows\Command
set classpath=. ;YOUR_INSTALL_DIR\lib\tools.jar

JAVA_HOME=your_install_dir/JDK/j2sdk
CLASSPATH=$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/td.jar:$JAVA_HOME/jr  
-e/lib/rt.jar:.
PATH=$PATH:$JAVA_HOME/bin
export PATH PS1 USER LOGNAME MAIL HOSTNAME HISTSIZE HISTFILESIZE   
INPUTRC JAVA_HOME CLASSPATH RESIN_HOME

[stone@coremsg work]$ vi Hello.Java
  public class Hello{
        public static void main(String []argc){
                System.out.println("Hello Word!");
        }
  }

[stone@coremsg work]$ Javac Hello.Java

[stone@coremsg work]$ Java Hello
     Hello Word!