Installing Oracle JAVA JDK 8 on Ubuntu [Offline]

download jdk from here first
Steps To Install JDK on Ubuntu or deepin os:
Step 1: Copy the Downloaded Java into home directory .
Step 2: Change the permission by clicking on properties . [change to Read, Write, Execute (777)] 
Step 3: Now Open The Terminal and Paste this command
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tar -xvzf jdk-8u51-linux-x64.tar.gz   
Press Enter. 
Step 4:  Create jvm folder in /usr/lib by the following command .
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sudo mkdir /usr/lib/jvm  
Step 5:  Move extracted jdk 8 folder to this location
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sudo mv jdk1.8.0 /usr/lib/jvm/jdk1.8.0  
Step 6:  Install new java source in the system:
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sudo update-alternatives –install /usr/bin/javac javac /usr/lib/jvm/jdk1.8.0/bin/javac 1
sudo update-alternatives –install /usr/bin/java java /usr/lib/jvm/jdk1.8.0/bin/java 1
sudo update-alternatives –install /usr/bin/javaws javaws /usr/lib/jvm/jdk1.8.0/bin/javaws 1 
Step 7: Choose default java:
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sudo update-alternatives –config javac
sudo update-alternatives –config java
sudo update-alternatives –config javaws
Step 8: Now you have successfully installed java in your system.

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