Configure JDK 7 in Ubuntu12.04

Step 1: Download jdkhttp: // response

Step 1: Download jdk
Http://www.oracle.com/technetwork/java/javase/downloads/index.html

Step 2: unzip and install
Go to the directory where the file is located and execute sudo tar zxvf jdk-7-linux-i586.tar.gz-C/usr/lib/jvm
Decompress the package to/usr/lib/jvm.

Step 3: Modify Environment Variables
Sudo gedit/etc/environment

PATH = "......:/usr/lib/jvm/java/jdk1.6.0 _ 12/bin"
CLASSPATH =.:/usr/lib/jvm/java/jdk1.6.0 _ 12/lib
JAVA_HOME =/usr/lib/jvm/java/jdk1.6.0 _ 12

Save and exit. Enter the following command to make it take effect immediately

Source ~ /. Bashrc

Step 4: configure the default JDK version
Ubuntu may have a default JDK, such as openjdk. To set the installed JDK to the default JDK version, perform the following operations:

Sudo update-alternatives -- install/usr/bin/java/usr/lib/jvm/jdk7/bin/java 300
Sudo update-alternatives -- install/usr/bin/javac/usr/lib/jvm/jdk7/bin/javac 300
Sudo update-alternatives -- install/usr/bin/jar/usr/lib/jvm/jdk7/bin/jar 300

Run

Sudo update-alternatives -- config java

JDK versions are listed as follows:

Three candidate items can be used to replace java (/usr/bin/java ).


Select the path priority status
------------------------------------------------------------
* 0/usr/lib/jvm/java-6-openjdk/jre/bin/java 1061 automatic mode
1/usr/lib/jvm/java-6-openjdk/jre/bin/java 1061 manual mode
2/usr/lib/jvm/java-6-sun/jre/bin/java 63 manual mode
3/usr/lib/jvm/jdk7/bin/java 300 manual mode


To maintain the current value [*], press the Enter key or enter the selected number: 3
Update-alternatives:/usr/lib/jvm/jdk7/bin/java is used to provide/usr/bin/java (java) in manual mode.

Step 5: Test
If java-version is executed and the corresponding version information is displayed, the configuration is successful.

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