How to check the version of jdk in linux

View method: 1. If the jdk environment variable is not set, you need to first use the cd command to enter the directory where the jdk is located, the syntax is "cd directory address", and then execute the "./bin/java -version" command. Get version information. 2. If the environment variable is set, directly execute "java -version" to obtain the version information.

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

JDK is a software development kit in the Java language, mainly used for Java applications on mobile devices and embedded devices. JDK is the core of the entire Java development. It includes the JAVA running environment (JVM Java system class library) and JAVA tools. So how to check what version of jdk is in linux? Find out below.

How to check the jdk version in Linux

1. The jdk environment variable is not set

1. Check the directory where jdk is located on Linux

[root@centos6 ~]# echo $JAVA_HOME

Get the directory where jdk is located/usr/java/jdk1.7.0_80

2. Enter the directory where jdk is located

[root@centos6 ~]# cd /usr/java/jdk1.7.0_80

3. Run

[root@centos6 jdk1.7.0_80]# ./bin/java -version

The result is as shown in the figure:

2. Set the environment variable

1. Execute

[root@centos6 usr]# java -version

in any directory. The result is as shown in the figure:

Expand knowledge : Uninstall jdk

1. Determine the JDK version:

[root@centos6 lib]# rpm -qa|grep jdk
[root@centos6 lib]# rpm -qa | grep gcj

Possible results are:

jdk-1.7.0_80-fcs.x86_64
libgcj-4.4.7-3.el6.x86_64

2. Then uninstall:

[root@centos6 lib]# rpm -e --nodeps libgcj-4.4.7-3.el6.x86_64
# 或者
[root@centos6 lib]# rpm -e --nodeps jdk-1.7.0_80-fcs.x86_64

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