install jdk on ubuntu 12.04

sudo apt-get update sudo apt-get install openjdk-7-jdk 编辑/etc/profile，添加环境变量：    export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-i386 export JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.:${JAVA_HOME}/lib:

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