Complete steps for setting java environment variables under Linux

Complete steps for setting java environment variables under Linux:

Download the JDK installation file from java.sun.com, usually in the format of jdk1.5.0_10_XXXX.bin.

Unlock and generate the JDK directory. It is assumed that the JDK is installed in /usr/java/jdk1.5.0_10:

Code:

sudo chmod 755 jdk1.5.0_10_XXXX.bin

sudo ./jdk1.5.0_10_XXXX.bin

sudo mkdir /usr/java

sudo mv jdk1.5.0_10/ /usr/java

Code:

sudo gedit /etc/profile

Append at the end of this file:

Code:

export JAVA_HOME =/usr/java/jdk1.5.0_10/

# Pay attention to append the bin directory of the newly added JDK at the front of $PATH, so that when there are multiple JDK versions installed in the system, the program will search first and rank it first The previous JDK version.

export PATH=$JAVA_HOME/bin:$PATH

export CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar:$CLASSPATH

After saving /etc/profile, don’t forget To execute the following command, the changes to the environment variables will take effect immediately.

Code:

source /etc/profile

If an error is reported when executing the above command, please carefully check whether the text you added in /etc/profile is wrong.

Finally check whether the environment variable changes have taken effect:

Code:

java -version

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