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1.sudo mkdir /usr/lib/jvm/sunjdk

2. wget http://download.oracle.com/otn-pub/java/jdk/6u31-b04/jdk-6u31-linux-i586.bin

3.chmod a+x /jdk-6u31-linux-i586.bin

4.sudo ./jdk-6u31-linux-i586.bin

5.gedit ~/.bashrc

6.add

export JAVA_HOME=/usr/lib/jvm/sunjdk/jdk1.6.0_31/

export PATH=$PATH:$JAVA_HOME/bin

7.source ~/.bashrc

8./usr/lib/jvm/sunjdk/jdk1.6.0_31/bin$ java -version

java version "1.6.0_31"

Java(TM) SE Runtime Environment (build 1.6.0_31-b04)

Java HotSpot(TM) Server VM (build 20.6-b01, mixed mode)

That's all.