Ubuntu How to install switch JDK version

There is always some version incompatibility when configuring the Java JDK, so let's talk about how to switch the JDK version.

My system comes with a JDK that is 1.6 execution java-version

1.JDK Installation

You can first use the command to install the JDK directly

sudo apt-get install Openjdk-7-jre openjdk-7-jdk.

You can also download the installation package post-pass command installation

TAR-ZXVF jdk-7u10-linux-i586.tar.gz

2. Add JDK:

Update-alternatives--install/usr/bin/java Java/usr/lib/jvm/java/jdk1.7.0_10/bin/java 300update-alternatives-- Install/usr/bin/javac Javac/usr/lib/jvm/java/jdk1.7.0_10/bin/javac 300 Note: The JDK1.7.0_10 version is subject to change

3. Check to see if the JDK is in the Ubuntu JDK menu:

sudo update-alternatives--config javasudo update-alternatives--config Javac

The results are as follows

Select serial number, enter can;

4. Then java-version,javac-version view the current JDK version

Ubuntu How to install switch JDK version