Deepin Linux Installation JDK

Recently installed in your own notebook Deepin Linux, although the use of the process found some bugs, but the overall feeling is good, ready to use her as a development system. The JDK that comes with the system is the open JDK, but the Oracle JDK is often required for Java development, so you need to install the Oracle JDK.

Download and install Oracle JDK

• Download tar.gz Package for JDK

Because I have developed a JDK7 so I downloaded it:

Http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

You can also download the latest JDK from the Oracle website:

Http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

• Unpack the Tarball

Go to download directory

CD ~/download

Unzip the tar.gz bag

tar -zxvf jdk-7u79-linux-x64. tar. gz

Installing the JDK

sudo MV Jdk1. 7. 0_79//USR/LIB/JVM/JAVA/JDK1. 7. 0_79

JDK environment variable Configuration

• Modifying a configuration file

sudo vim/etc/profile

Add content at the end of a file

Java_home=/usr/lib/jvm/jdk1.7.0_79classpath=/usr/lib/jvm/jdk1.7.0_79/libpath= $PATH: $JAVA _home/bin:$ Classpathexport PATH

Note the path and version of the JDK

• Make configuration effective

Source/etc/profile

Configuring the default JDK

• Create a new Java version

Create a new system command link in the shell with the update-alternatives command:

sudoUpdate-alternatives--Install/usr/bin/javac Javac/usr/lib/jvm/jdk1.7.0_79/bin/javac1171sudoUpdate-alternatives--Install/usr/bin/java Java/usr/lib/jvm/jdk1.7.0_79/bin/java1171sudoUpdate-alternatives--Install/usr/bin/jar Jar/usr/lib/jvm/jdk1.7.0_79/bin/jar1171   sudoUpdate-alternatives--Install/usr/bin/javah Javah/usr/lib/jvm/jdk1.7.0_79/bin/javah1171   sudoUpdate-alternatives--Install/USR/BIN/JAVAP Javap/usr/lib/jvm/jdk1.7.0_79/BIN/JAVAP1171 

Update-alternatives is a tool dedicated to maintaining system command links in the Ubuntu system, and the following 1171 is used to specify the priority of the current link, and the highest priority is automatically set to the default version.

You can use the following command to view the version and priority of Java:

Update-alternatives--display Java

• Choose the version of Java

Execute command

Update-alternatives--config Java

Output

2 Candidates can be used to replace Java (provides/usr/bin/Java).  Select the       path                                          priority  State 0            /usr/lib/jvm/jdk1.  7. 0_79/bin/java                1171       Auto mode   1            /usr/lib/jvm/java-8 -openjdk-amd64/jre/bin/java   1081       manual mode   2            /usr/lib/ Jvm/jdk1. 7. 0_79/bin/java                1171      Manual mode

You can see that the JDK that you just configured has a 1.7 priority configuration of 1171, which is higher than the original 1081, so it is automatically set to default.

Test

• View Java version

Execute the following command on the shell

Java-version

If you get the following output, it proves that the JDK has successfully installed the configuration.

Picked up _java_options:   -dawt.usesystemaafontsettings="1.7.0_79"   1.7. 0_79-24.79-b02, Mixed mode)

Reprint Please specify source: http://www.cnblogs.com/keitsi/p/5817433.html

Deepin Linux Installation JDK