reprinted from: Rainwater: http://blog.csdn.net/gobitan/article/details/24367439
installing Oracle JDK under Ubuntu LinuxDennis Hu 2014-4-22
Description:Because many systems do not support the use of OPENJDK, it is necessary to install Oracle JDK under Ubuntu. While the installation of Oracle JDK does not seem to provide the apt way, so the way to install Oracle JDK is relatively troublesome, I often install, in order to facilitate others at the same time to check, write it down.
First step: differentiate between 32-bit or 64-bit operating systemsFirst determine whether your Ubuntu Linux is 32-bit or 64-bit, a lot of methods, here is a description. $uname-A
Step Two: Uninstall OpenJDKRun the following command to see if OPENJDK is installed, and if it is already installed, the Java information will be displayed. $java-version If OPENJDK is installed, it can be uninstalled in the following ways: $sudo Apt-get purge openjdk-\*
Step three: Download the Oracle JDK versionNote: Here is an example of Oracle 1.6 64-bit entry into http://www.oracle.com/technetwork/java/javasebusiness/downloads/ java-archive-downloads-javase6-419409.html, select Java SE development Kit 6u45, and then click Accept on the newly opened page
Accept License Agreement". Once accepted, select "Jdk-6u45-linux-x64.bin" to download. If you are not logged in, the system will first go to the login page and enter the username and password you registered with the Oracle website.
Step three: Install Oracle JDK(1) Create Java directory $ sudo mkdir-p/usr/local/java copy your downloaded Jdk-6u45-linux-x64.bin to/usr/local/java directory $ cd/usr/local/java$ sudo cp /home/dennis/downloads/jdk-6u45-linux-x64.bin. (2) Extract bin file $ sudo chmod +x jdk-6u45-linux-x64.bin$ sudo./jdk-6u45-linux-x64.bin$ sudo rm-rf jdk-6u45-linux-x64.bin
Fourth Step: Configuring the Orache JDK(1) Configure the Java_home and PATH environment variables $ sudo vi/etc/profile at the end of the file with the following sections: Java_home=/usr/local/java/jdk1.6.0_45 path= $PATH: $HOME/ Bin: $JAVA _home/bin export Java_home export path (2) Configure Ubuntu JDK and JRE location $ sudo update-alternatives--install "/usr/ Bin/java "java" "/usr/local/java/jdk1.6.0_45/bin/java" 1$ sudo update-alternatives--install "/usr/bin/javac" "Javac" "/usr/local/java/jdk1.6.0_45/bin/javac" 1$ sudo update-alternatives--install "/usr/bin/javaws" "Javaws" "/usr/local/ Java/jdk1.6.0_45/bin/javaws "1 (3) Configure Oracle for system default jdk/jre$ sudo update-alternatives--set java/usr/local/java/ jdk1.6.0_45/bin/java$ sudo update-alternatives--set javac/usr/local/java/jdk1.6.0_45/bin/javac $ sudo After the update-alternatives--set javaws/usr/local/java/jdk1.6.0_45/bin/javaws configuration is complete, execute the following command to make it effective immediately. $ . /etc/profile perform the "java-version" display as follows: [email protected]:~$ java-version java Version "1.6.0_45" Java (TM) SE Runtime Environment (build 1.6.0_45-b06) Java HotSpot (TM) 64-bit Server VM (Build 20.45-b01, mixed mOde
