1
apt-get install sun-java5-bin sun-java5-jdk sun-java5-fonts sun-java5-plugin
2
设置环境变量
#vi /etc/profile
追加到 /etc/profile：(我的安装路径是：/usr/lib/jvm/java-1.5.0-sun--->系统默认)
JAVA_HOME=/usr/lib/jvm/java-1.5.0-sun
JRE_HOME=/usr/lib/jvm/java-1.5.0-sun/jre
CLASSPATH=.:/usr/lib/jvm/java-1.5.0-sun/lib/tools.jar:/usr/lib/jvm/java-1.5.0-sun/lib/dt.jar
PATH=$PATH:/usr/lib/jvm/java-1.5.0-sun/bin:/usr/lib/jvm/java-1.5.0-sun/jre/bin
export PATH
export JRE_HOME
export JAVA_HOME
export CLASSPATH
3
sudo update-alternatives --list java
sudo update-alternatives --config java
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