How to install jdk in linu

JDK is a Java language software development toolkit, mainly used for java applications on mobile devices and embedded devices. JDK is the core of the entire Java development. It includes the JAVA runtime environment (JVM+Java system class library) and JAVA tools. This article mainly shares with you how to install jdk in linu. I hope it can help you.

1: Download jdk

Address: Click to open the link

##2: Uninstall openjdk

Some versions of centos have OpenJDK installed by default, so you need to check it first

Command: rpm -qa | grep java

displays as follows: (If it exists, uninstall it, if not, don’t use it.) Note that the version may be slightly different, whichever is actual.
tzdata-java-2013g-1.el6.noarch
java-1.7.0-openjdk-1.7.0.45-2.4.3.3.el6.x86_64
java-1.6.0-openjdk-1.6.0.0 -1.66.1.13.0.el6.x86_64


Uninstall openjdk:

(where the parameter "tzdata-java-2013j-1.el6.noarch" is the one shown in the above view Just paste the result in. If what you see is different, please copy the result you found)

rpm -e --nodeps tzdata-java-2013g-1.el6.noarch
rpm -e --nodeps java-1.7.0-openjdk-1.7.0.45-2.4.3.3.el6.x86_64
rpm -e --nodeps java-1.6.0-openjdk-1.6.0.0-1.66.1.13. 0.el6.x86_64

Three: Create directory, upload, decompress

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##[root@localhost java]# cd /usr/local
[root@localhost local]# mkdir java #Create java directory
[root@localhost local]# cd java
Upload the downloaded jdk-8u161-linux-x64.tar.gz to the java directory and decompress it

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##[root@localhost java]# tar -zxvf jdk -8u161-linux-x64.tar.gz #Decompression

1. ##[root@localhost java]# mv jdk1.8.0_161 jdk #Rename

Four: Configure environment variables

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[root@localhost java]# vi /etc/profile

1. Add the following content:

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#set java environment

JAVA_HOME=/usr/local/java/jdk #java path According to your own reality Path to configure
JRE_HOME=/usr/local/java/jdk/jre #jre path Configure according to your own real path
CLASS_PATH =.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/ bin

4. ##export JAVA_HOME JRE_HOME CLASS_PATH PATH

5. Related recommendations:

6. Linux uninstall jdk, rpm command, rm Command parameter method

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