Ubuntu14.04 configure JDK1.8.0 _ 25 to switch the version

Ubuntu14.04 configure jdk 1.8.0 _ 25 to switch to jdk. Decompress: sudomkdir/usr/lib/jvmsudotarzxvf/home/user name/Downloads/jdk-8u25-linux-i586.tar.gz-C/usr/lib/jvm modify environment variables: // tested here you can not configure, after configuration, you cannot switch the version using the following command. Test method: H

Configure jdk 1.8.0 _ 25 in Ubuntu 14.04. You can switch the version to jdk.

Decompress:

Sudo mkdir/usr/lib/jvm

Sudo tar zxvf/home/user name/Downloads/jdk-8u25-linux-i586.tar.gz-C/usr/lib/jvm

Modify the environment variable: // The environment variable is not configured after the test. After the configuration, the following command cannot be used to switch the version.

Test method: Hadoop-2.6.0 with jdk1.8.25 compilation will be wrong, but with openjdk will not, by setting different versions, indeed when the 1.8.25 error occurs, so do not configure here.

Sudo gedit/etc/profile

# Set java environment
Export JAVA_HOME =/usr/lib/jvm/jdk1.8.0 _ 25
Export JRE_HOME =$ {JAVA_HOME}/jre
Export CLASSPATH =. :$ {JAVA_HOME}/lib :$ {JRE_HOME}/lib
Export PATH =$ {JAVA_HOME}/bin: $ PATH

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

Configure the default JDK:

Sudo update-alternatives -- install/usr/bin/java/usr/lib/jvm/jdk1.8.0 _ 25/bin/java 300
Sudo update-alternatives -- install/usr/bin/javac/usr/lib/jvm/jdk1.8.0 _ 25/bin/javac 300
// Do not configure the following two items
Sudo update-alternatives -- install/usr/bin/javah/usr/lib/jvm/jdk1.8.0 _ 25/bin/javah 300
Sudo update-alternatives -- install/usr/bin/jar/usr/lib/jvm/jdk1.8.0 _ 25/bin/jar 300
// Version switch command

Sudo update-alternatives -- config java
Sudo update-alternatives -- config javac

Test

Java-version
Javac-version

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