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I installed the jdk7u80 the oracle and I wonder what I should do to completely remove it and install the jdk7u76 the oracle?

$ java -version
java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)

$ javac -version
javac 1.7.0_80
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It could be done like this:

Remove the link:

sudo update-alternatives --remove "java" "/usr/lib/jvm/jdk[version]/bin/java"

sudo update-alternatives --remove "javac" "/usr/lib/jvm/jdk[version]/bin/javac"

sudo update-alternatives --remove "javaws" "/usr/lib/jvm/jdk[version]/bin/javaws"

Then, remove the package in the /usr/lib/jvm

sudo rm -r /usr/lib/jvm/jdk[version]

Note :

Change [version] with any version number that's contained in jdk folder's name, example : jdk[version] = jdk1.7.0_13

For installation specific java file:

  1. Download it from here.
  2. Optional (if you are not logged as root you need)

    sudo su
    
  3. Untar the package tar -zxf jdk-7u76-linux-x64.tar.gz -C /opt/jdk

  4. Set Oracle's Java as default

    update-alternatives --install /usr/bin/java java  /opt/jdk/[version]/bin/java 100
    

    update-alternatives --install /usr/bin/javac javac /opt/jdk/[version]/bin/javac 100

  5. Check Java version if it is ok

    java -version 
    
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