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  • How to install jdk in ubuntu

    From : http://www.blogs.digitalworlds.net/softwarenotes/?p=41

    Install Java JDK 7 on Ubuntu 12.04 (JavaFX is included in the installation)

    This package provides Oracle Java JDK 7 (which includes JRE, the Java browser plugin and JavaFX). However, you can’t only install Oracle JRE – the PPA only provides the full Oracle JDK7 package.

    1. To add our PPA and install the latest Oracle Java (JDK) 7 in Ubuntu, use the commands below:

    #sudo add-apt-repository ppa:webupd8team/java
    #sudo apt-get update && sudo apt-get install oracle-jdk7-installer

    2. After the installation you have enable the jdk:

    #update-alternatives –display java

    3. Check if Ubuntu uses Java JDK 7

    #java -version

    If all went right the answer should be something like this:
    java version “1.7.0_07″
    Java(TM) SE Runtime Environment (build 1.7.0_07-b10)
    Java HotSpot(TM) Server VM (build 23.3-b01, mixed mode)

    4. Check what compiler is used:

    #javac -version

    The correct answer should be like this:
    javac 1.7.0_07

    5. Adding JAVA_HOME to environment
    Edit /etc/environment and add JAVA_HOME=/usr/lib/jvm/java-7-oracle to the end of the file.
    First open a Terminal (Applications → Accessories → Terminal), then enter:

    #sudo gedit /etc/environment

    Append to the end of the file:
    JAVA_HOME=/usr/lib/jvm/java-7-oracle

    6. Removing Oracle JDK 7

    If you don’t want to use Oracle Java (JDK) 7 anymore and want to go back to OpenJDK, all you have to do is remove the Oracle JDK7 Installer and the previous Java (OpenJDK, etc.) version will be used:

    #sudo apt-get remove oracle-jdk7-installer

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  • 原文地址:https://www.cnblogs.com/inbase/p/3129315.html
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