Installing JDK under Linux

First, download the JDK

: http://www.oracle.com/technetwork/java/javase/downloads/index.html

View Linxu number of system bits:getconf long_bit

According to the number of bits of the system, download the corresponding version, mine is 64-bit:

Second, unzip the JDK

Unzip the JDK file: (tar-xzf source file target directory), if the target directory does not have permissions, you can use root permissions

Tar-xzf jdk-8u45-linux-x64.tar.gz/usr/share/java/

Third, set environment variables

1. System-Level environment variables:/etc/profile

2. User-level environment variables:/home/User name/.bash_profile

Use the VI command to open:

Vi/etc/profile

Then press i to enter insert mode, add at the end

Export java_home=/usr/share/java/ jdk1.8.0_45

Export path= $JAVA _home/bin: $PATH

Export classpath=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/toos.jar

Then press "ESC" key, then enter : Wq , then return, save exit.

Then execute the following command to make the environment variable effective

Source/etc/profile

Iv. Test whether the JDK is in effect

Java-version

If the following is displayed, the installation is successful:

Java Version "1.8.0_45"

Installing JDK under Linux