Ubuntu Replace system OpenJDK

Some Ubuntu comes with a JDK. But sometimes it's exactly what we want. The following describes how to replace the JDK

1. Uninstalling an existing JDK

sudo apt-get purge openjdk-\*

2. Download the JDK.

3. Create a directory under the/usr/local/folder: sudo mkdir -p /usr/local/java

4. Copy the JDK to the third-step folder.

sudo cp -r jdk...tar.gz /usr/local/java/

5. Extracting files

 sudo tar xvzf jdk-8u51-linux-x64.tar.gz

6. Update the path below/etc/profile.

< Span class= "PLN" >    java_home =/usr/local/ java/jdk1. 8.0_51

< Span class= "pun" >< Span class= "PLN" >  path= $PATH : $HOME /bin: $JAVA _home/< Span class= "PLN" >bin

< Span class= "pun" >< Span class= "pun" >< Span class= "PLN" >< Span class= "PLN" >  export java_home

  export PATH

7. Run the following script

sudo update-Alternatives--Install"/usr/bin/java"  "java"  /usr/local/java/jdk1.../bin/ Java " 1sudo update---install  "/usr/bin/javac"  span class= "str" > "Javac"   "/usr/local/java/jdk1.../bin/javac"  1sudo update---install  "/usr/bin/javaws"  "javaws"   "/usr/local/java/jdk1.../bin/javaws"  1 
 8.             

sudo update-Alternatives--Set Java/Usr/Local/Java/Jdk1.8.0_51/Bin/Javasudo Update-Alternatives--set javac /usr/local< Span class= "pun" >/java/jdk1. 8.0_51/bin/javacsudo Update-alternatives --set javaws /usr/local/ java/jdk1. 8.0_51/bin/javaws   
9. Reload the following script
Source/etc/profile
Ten. Roboot Ubuntu

Ubuntu Replace system OpenJDK