Ubuntu JDK

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  1. Remove default OpenJDK

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    sudo apt-get purge openjdk-\*

  2. download jdk(containing jre) and tar.

  3. add into /etc/profile

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    JAVA_HOME="/home/newly/Program_Files/Java/jdk1.8.0_65"
    PATH="$PATH:$JAVA_HOME/jre/bin:$JAVA_HOME/bin"

  4. set newly installed jdk as default jdk.

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    sudo update-alternatives --install "/usr/bin/java" "java" "$JAVA_HOME/bin/java" 1
    sudo update-alternatives --install "/usr/bin/javac" "javac" "$JAVA_HOME/bin/javac" 1
    sudo update-alternatives --install "/usr/bin/javaws" "javaws" "$JAVA_HOME/bin/javaws" 1