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tar.gz package for the corresponding JDK, and put it in:/var/cache/oracle-jdk7-installer (JDK7)/var/cache/oracle-jdk8-installer (JDK8)Below, and then install the installer once. Installer will use the TAR.GZ package you downloaded by default3. Set the system default JDKJDk7sudo update-java-alternatives-s java-7-oracleJDK8sudo update-java-alternatives-s java-8-oracleIf the JDK7 is installed and the JDK8 is

. After the installation is complete, verify that[Email protected] ~]# java-"1.6.0_37"1.13. 9) (rhel-1.13. 9.4. el5_11-23.25-b01, Mixed mode)4. The path to the default installation via Yum is/usr/lib/jvm[Email protected] ~]# cd/usr/lib/Jvm[[email protected] jvm]# lltotal -drwxr-xr-x3Root root4096Jan A -: onjava-1.6.0-openjdk-1.6.0.37. x86_64lrwxrwxrwx1Root root +Jan A -: onJRE-/etc/alternatives/jrelrwxrwxrwx1Root root -Jan A -: onjre-1.6.0/etc/

It has been installed several times before, but each time you need to install again and have to re-search the tutorial, to record their own to avoid forgetting.Install JDK DownloadDownload: Click to open the link, I downloaded the filename is jdk-8u66-linux-x64.tar.gzUnzip the installationI'm going to install it under/opt/jvm/.First extract, TAR-ZXVF jdk-8u66-linux-x64.tar.gz, get jdk1.8.0_66Rename and move to/OPT/JVM,mv jdk1.8.0_66/jdk1.8/ mv jdk1.8.0_66//opt/jvm/Setting Environment Variablese

~]$ sudo rm-rf/usr/lib/jdk/jdk1.8.0_11/#删除[Randy@localhost ~]$ LS/USR/LIB/JDKBin Javafx-src.zip Mans Thirdpartylicensereadme-javafx.txtCOPYRIGHT JRE readme.html THIRDPARTYLICENSEREADME.txtDB Lib ReleaseInclude LICENSE Src.zip[Randy@localhost ~]$ 2. Configure Environment variables [Randy@localhost ~]$ sudo vim/etc/profileInsert on last line: #JAVA EnvironmentExport JAVA_HOME=/USR/LIB/JDKExport JRE_HOME=/USR/LIB/JDK/JREExport path= $JAVA _home/bin: $JRE _home/bin: $PATHExport classpath= $C

Create a Python development environment in Ubuntu13.10: Step 1 install JDK (to install ECLIPSEIDE) decompress the installation package and set JDK. The update-alternatives -- install option feature adds a new set of system command links. Tar-zxvfjdk-7u45-linux-x64.tar.gzsudomkdir-p/usr/lib/jvmsudomv./j Build a Python development environment in Ubuntu 13.10: Step 1 install JDK (to install eclipse ide) Decompress the installation package and set JDK. Th

/controlpanelIcon =/usr/lib/Java/JRE/plugin/desktop/sun_java.pngTerminal = 0Type = ApplicationCategories = application; settings; X-sun-supported; X-red-hat-base; In this way, you can start the Java console through the menu... 3. Use alternatives to run all Java commands, man, and plugin.Finally, create a link for the command under JDK bin, install the plug-in for Mozilla, and create a shell file with the following content: #! /Bin/bash

thirdpartylicensereadme.txt include lib release [[email protected] ~] $ Sudo Rm-RF/usr/lib/JDK/jdk1.8.0 _ 11/# Delete [email protected] ~] $ Ls/usr/lib/jdkbin javafx-src.zip man THIRDPARTYLICENSEREADME-JAVAFX.txtCOPYRIGHT JRE readme.html thirdpartylicensereadme.txt dB lib releaseinclude license src.zip [[email protected] ~] $ 2. Configure Environment Variables [[Email protected] ~] $ Sudo Vim/etc/profile is inserted in the last line: # Java environmentexport java_home =/usr/lib/jdkexport jre_

-- include = \ *. conf bash/etc /*/Etc/adduser. conf Similarly, using the -- exclude option, we can exclude any specific file name: Bkjia @ bkjia :~ $ Sudo grep-Ril -- exclude = \ *. conf bash/etc /*/Etc/alternatives/lzcmp/Etc/alternatives/vivaldi/Etc/alternatives/vi/Etc/alternatives/view/Etc/

+ F7 to return to the desktop.Another point is that when you configure the environment, do not leave spaces between the Environment name and the corresponding environment path, such as JAVA_HOME =/opt/jdk1.7.0 _ 45 "=" on both sides, which should be unrecognized by bash.4. Because ubuntu comes with the JVM Implementation of gij, the following information is displayed when you type "java-version" on the terminal: java version "1.6.0. This means that the JVM implementation is already available in

ubuntu16.04 python2.7 and python3.5 are installed by default. This tutorial uses python3.5The first step: Modify the default ubuntu16.04 Python2 to use Python3 by default.sudo update-alternatives--install/usr/bin/python python/usr/bin/python2 100sudo update-alternatives--install/usr/ Bin/python Python/usr/bin/python3 150Running the above code will modify ubuntu16.04 by default using Python2 to use Python3 b

reasons, you can interrupt the operation. Then download the tar.gz package for the corresponding JDK, and put it in:/var/cache/oracle-jdk7-installer (JDK7)/var/cache/oracle-jdk8-installer (JDK8)Below, and then install the installer once. Installer will use the TAR.GZ package you downloaded by default3. Set the system default JDKJDk7sudo update-java-alternatives-s java-7-oracleJDK8sudo update-java-alternatives