Ubuntu14.04 install jdk1.7

1. Download jdk-7u45-linux-x64.tar.gz 

     URL: http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

2, Unzip the JDK

         Go to the download directory of the JDK

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1. sudo tar zxvf jdk-7u45-linux-x64.tar.gz  -C /usr/lib/jvm   

 3, set environment variables (global)

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1. sudo gedit  /etc/profile  

   Open the profile file and enter

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1. export JAVA_HOME=/usr/lib/jvm/jdk1.7.0_65  
2. export CLASSPATH=".:$JAVA_HOME/lib:$CLASSPATH"  
3. export PATH="$JAVA_HOME/bin:$PATH"  

 4, set the system default JDK

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1. sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0_65/bin/java 300  
2. sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0_5/bin/javac 300  
3. sudo update-alternatives --config java  

 5, Verify JDK

   input the command

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1. java -version  

   Seeing the JDK information means success.