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   export JAVA_HOME = /usr/usr/java/jdk1.6.0_10 --jdk°²×°Ä¿Â¼
   export CALSSPATH = $JAVA_HOME/lib/*.*         --jar°üËùÔÚĿ¼
   export PATH = $PATH:$JAVA_HOME/bin            --binĿ¼
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   java
Usage: java [-options] class [args...]
           (to execute a class)
   or java [-options] -jar jarfile [args...]
           (to execute a jar file)
where options include:
    -d32          use a 32-bit data model if available
(´Ë´¦Ê¡ÂÔһЩÄÚÈÝ)
                  load Java programming language agent, see java.lang.instrument
    -splash:<imagepath>
                  show splash screen with specified image
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javac
Usage: javac <options> <source files>
where possible options include:
-g                         Generate all debugging info
-g:none                    Generate no debugging info
-g:{lines,vars,source}     Generate only some debugging info
-nowarn           &n


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