Installing the JDK in debian

1) Download and Uncompressed the JDK file


2) move the JDK directory to /usr/lib/jvm

Example
sudo mv ./jdk1.7.0_02  /usr/lib/jvm/jdk1.7.0

3) run

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 --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.7.0/bin/javaws" 1

4) Run

sudo update-alternatives --config java

Press enter to keep the current choice[*], or type selection number: 3


5) confirm the success of new installation 

java -version

6) Repeat the step 4 for:

sudo update-alternatives --config javac
sudo update-alternatives --config javaws



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