Ubuntu Configuration JDK Environment variables

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1, to the official website download JDK7, find jdk-7u21-linux-i586.tar.gz and download: http://www.oracle.com/technetwork/java/javase/downloads/ Jdk7-downloads-1880260.html

2. After extracting the folder named Jdk1.7.0_21, copy it to/USR/LIB/JVM (new JVM folder is required).

　　

3. Configure the JDK environment variables:

When you start the terminal and enter

Gedit/etc/profile  

　　

Add the configuration at the end, save and exit

#set JDK Environment  export java_home=/usr/lib/jvm/jdk1.7.0_21  export classpath=.: $JAVA _home/lib: $JAVA _ Home/jre/lib: $CLASSPATH  export path= $JAVA _home/bin: $JAVA _home/jre/bin: $PATH  

Terminal input command to make configuration effective

Source/etc/profile  

　　

4. See if the configuration is successful. In the terminal input

Java-version

　　

If the display version is 1.7.0.21, the configuration succeeds, as shown below:

Java version "1.7.0_21"  Java (tm) SE Runtime Environment (build 1.7.0_21-b11)  Java HotSpot (tm) Server VM (build 23. 21-B01, Mixed mode)  

　　

If the display is still OPENJDK, perform step 5, test again

5, configure default Jdk,ubuntu under Default JDK is OPENJDK. Terminal input

sudo update-alternatives--install/usr/lib/java java/usr/lib/jvm/jdk1.7.0_17/bin/java  sudo Update-alternatives--install/usr/lib/javac Javac/usr/lib/jvm/jdk1.7.0_17/bin/javac 300  

　　

Execute the following command to configure the default JDK

sudo update-alternatives--config java  

　　

The JDK version is listed, which is labeled "*" as the default JDK. If you want to maintain the current default JDK, press ENTER directly, otherwise enter the number of the corresponding JDK to set it as the default version.

Ubuntu Configuration JDK Environment variables