Ubuntuinstall jdk(tar.gz)

If no root user is created:

1 sudo passwd root

 

Download JDK (Baidu "JDK" character tar.gz package: jdk-7u55-linux-x64.gz this is the version I downloaded, the name of the specific version of the prevail to switch to the root:

1 su - root

 

Decompress the file:

1 gunzip jdk-7u55-linux-x64.gz2 tar -xf jdk-7u55-linux-x64

Get the jdk1.7.0 _ 55 folder.

 

Move to/USR:

1 mv jdk1.7.0_55 /usr

 

Set environment variables:

1 gedit /etc/profile

Add at the end:

1 export JAVA_HOME=/usr/jdk1.7.0_552 export JRE_HOME=/usr/jdk1.7.0_55/jre3 export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH4 export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH

 

Modify the default JDK:

1 update-alternatives --install /usr/bin/java java /usr/jdk1.7.0_55/bin/java 3002 update-alternatives --install /usr/bin/javac javac /usr/jdk1.7.0_55/bin/javac 300

 

View the JDK version:

1 java -version

Ubuntuinstall jdk(tar.gz)