CARA INSTALL JAVA CENTOS

There are also two different implementations of Java, OpenJDK and Oracle Java with almost no differences between them except that Oracle Java has a few additional commercial features.

Install OpenJDK
OpenJDK, the open source implementation of the Java Platform is the default Java development and runtime in CentOS 7.

The installation is simple and straightforward.



Install OpenJDK 8 JRE
sudo yum install java-1.8.0-openjdk
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Install OpenJDK 8 JDK
sudo yum install java-1.8.0-openjdk-devel
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Install OpenJDK 7 JRE
sudo yum install java-1.7.0-openjdk
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Install OpenJDK 7 JDK
sudo yum install java-1.7.0-openjdk-devel
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Install Oracle Java 9 JRE
curl -L -b "oraclelicense=a" -O http://download.oracle.com/otn-pub/java/jdk/9.0.4+11/c2514751926b4512b076cc82f959763f/jre-9.0.4_linux-x64_bin.rpm
sudo yum localinstall jre-9.0.4_linux-x64_bin.rpm
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Install Oracle Java 9 JDK
curl -L -b "oraclelicense=a" -O http://download.oracle.com/otn-pub/java/jdk/9.0.4+11/c2514751926b4512b076cc82f959763f/jdk-9.0.4_linux-x64_bin.rpm
sudo yum localinstall jdk-9.0.4_linux-x64_bin.rpm
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Install Oracle Java 8 JRE
curl -L -b "oraclelicense=a" -O http://download.oracle.com/otn-pub/java/jdk/8u162-b12/0da788060d494f5095bf8624735fa2f1/jre-8u162-linux-x64.rpm
sudo yum localinstall jre-8u162-linux-x64.rpm
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Install Oracle Java 8 JDK
curl -L -b "oraclelicense=a" -O http://download.oracle.com/otn-pub/java/jdk/8u162-b12/0da788060d494f5095bf8624735fa2f1/jdk-8u162-linux-x64.rpm
sudo yum localinstall jdk-8u162-linux-x64.rpm
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Set the default version
We can check the version of our default Java, with:

java -version
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java version "9.0.4"
Java(TM) SE Runtime Environment (build 9.0.4+11)
Java HotSpot(TM) 64-Bit Server VM (build 9.0.4+11, mixed mode)
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If we have multiple Java versions installed on the server we can change the default version using the alternatives system:

sudo alternatives --config java
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The output should look similar to the following:

There are 4 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
   1           /usr/java/jdk1.8.0_162/jre/bin/java
   2           java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-0.b14.el7_4.x86_64/jre/bin/java)
   3           java-1.7.0-openjdk.x86_64 (/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.171-2.6.13.0.el7_4.x86_64/jre/bin/java)
*+ 4           /usr/java/jdk-9.0.4/bin/java

Enter to keep the current selection[+], or type selection number:
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Just enter the number when prompted and hit Enter.

Uninstall Java
If for any reason you want to uninstall the Java package, you can unistall it as any other package installed with yum. For example if you want to uninstall the java-1.8.0-openjdk-devel package simply run:

sudo yum remove java-1.8.0-openjdk-devel
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If you have any questions feel free to leave a comment.