如果不想使用Ubuntu提供的OpenJDK,想使用Oracle的版本。可以进行如下操作
tar xvzf jdk-7u10-linux-x64.tar.gz
sudo mv ./jdk1.7.0_10 /usr/lib/jvm/jdk1.7.0
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.7.0/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.7.0/bin/javac" 1
sudo update-alternatives --config java
There are 2 choices for the alternative java (providing /usr/bin/java).
Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1071 auto mode
1 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1071 manual mode
2 /usr/lib/jvm/jdk1.7.0/bin/java 1 manual mode
Press enter to keep the current choice[*], or type selection number: 2
选择刚刚配置的jdk。 类似再操作
sudo update-alternatives --config javac
之后,就可以使用java -version检测一下是否安装正确了。