Install jdk 1.7 under linux

1 Download jdk 1.7 linux versionhttp://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

2. Extract the downloaded file to/usr/local/development/jdk1.7.0_04table of Contents.

3. Create a file/etc/profile.d/development.sh, copy the following to the file.

export JAVA_HOME=/usr/local/development/jdk1.7.0_04
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH

4 Modify the jdk used by the system by default:

update-alternatives --install /usr/bin/java java /usr/local/development/jdk1.7.0_04/bin/java 300

update-alternatives --install /usr/bin/javac javac /usr/local/development/jdk1.7.0_04/bin/javac 300

5. Restart your computer and use the commandjava -versionCheck if the JDK is installed successfully.

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