jdk

jre

====================================

# ./jre1.6.0_27-for-linux.bin

# ls /usr/java/jre1.6.0_27/

# mv /usr/java/jre1.6.0_27/* /usr/java/

# vi profile27

export JAVA_HOME=/usr/java
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=$JAVA_HOME/lib

====================================

# sh jdk-6u24-dlj-linux-amd64.bin

# mv jdk1.6.0_24/ /usr/jdk

# vi profile24

export JAVA_HOME=/usr/jdk
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=$JAVA_HOME/lib:$JAVA_HOME/jre/lib

# unpack200 lib/tools.pack /lib/tools.jar

# unpack200 jre/lib/rt.pack /jre/lib/rt.jar

=====================================

# which unpack200

/usr/java/bin/unpack200            (很明显这是个递归)

# . profile27

# which java

# . profile 24

# which java