在Debian和Ubuntu下安装官方64位Java

在Debian和Ubuntu上安装官方64位Java
首先去Oracle下载最新的版本

mkdir -p /opt/java/64
cd /opt/java/64
tar xf jdk-7u7-linux-x64.tar.bz2
chown -R root.root /opt/java
chmod ugo+rx -R /opt/java

update-alternatives --install /usr/bin/java java /opt/java/64/jdk1.7.0_07/bin/java 666
update-alternatives --install /usr/bin/javac javac /opt/java/64/jdk1.7.0_07/bin/javac 666
update-alternatives --set java /opt/java/64/jdk1.7.0_07/bin/java
update-alternatives --set javac /opt/java/64/jdk1.7.0_07/bin/javac

验证一下安装结果:

update-alternatives --config java
java -version