ubuntu11.04更改默认JDK

第一步，安装Sun的JDK：

sudo apt-get install sun-java6-jre

sudo apt-get install sun-java6-jdk

此时，在命令行里面输入java -version，显示的JDK仍然是OpenJDK，所以需要修改默认的JDK

第二步，修改默认JDK

sudo update-alternatives --config java

此时，命令行中会提示你选择合适的JDK，如

There are 2 choices for the alternative java (providing /usr/bin/java).

Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/lib/jvm/java-6-openjdk/jre/bin/java 1061 auto mode
1 /usr/lib/jvm/java-6-openjdk/jre/bin/java 1061 manual mode
2 /usr/lib/jvm/java-6-sun/jre/bin/java 63 manual mode

Press enter to keep the current choice[*], or type selection number: 2

选择java-6-sun后，再输入java -version，就会显示Sun的JDK信息了