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format for installing Java 6 is as follows: Java 6 (for Android 2.1 + ): $ Sudo add-Apt-repository "Deb http://archive.canonical.com/lucid partner" $ Sudo add-Apt-repository "Deb-Src http://archive.canonical.com/ubuntu lucid partner" $ Sudo apt-Get update $ Sudo apt-Get install sun-java6-jdk If you want to switch to the Java version (when multiple Java versions are installed), enter the following command: Sudo Update-alternatives -- config Java Sudo

As we all know, GCC does not support "make Uninstall ". A recommended installation method is to install GCC in a path you specify. When you do not need a GCC version number, you only need to remove the corresponding version number. If you already have an old version number in your system, the simplest method is: 1) join? Personal package archive in the repositories 2. repositoris) 3) upgrade procedure sudo add-apt-repository ppa:ubuntu-toolchain-r/testsudo apt-get updateJoin? New Ppa (peronal

Step 1: Check the version and installed version Lee @ Lee :~ $ Ls/usr/bin/GCC * /Usr/bin/GCC/usr/bin/gcc-4.5/usr/bin/gcc-4.6 If 4.5 is missing, install it. Sudo apt-Get install gcc-4.5 g ++-4.5 G ++-V Gcc-V Step 2: Add options Sudo Update-alternatives -- install/usr/bin/GCC gcc/usr/bin/gcc-4.5 40 Sudo Update-alternatives -- install/usr/bin/GCC gcc/usr/bin/gcc-4.6 30 Sudo Update-

=.: $ JAVA_HOME/lib: $ JAVA_HOME/jre/lib Next # Source/root/. bashrc switch to your user and then under source.# Echo $ JAVA_HOME/Usr/java/java7 If openjdk is not installed, enter #/Usr/java/java7/bin/java-version Now let's start the link. add to the bin of the system and use the update-alternatives command to maintain the soft connection of the system. update this command to let the system know which command to use. the last parameter is priority. h

Switch GCC, G ++, and gfortran versions in Ubuntu Step 1: use which gcc, which g ++, and which gfortran to view the location. My result is/usr/bin/gcc; /usr/bin/g ++ and/usr/bin/gfortran Part 2: first, let's take a look at the gcc commands installed in your Ubuntu: ls/usr/bin/gcc *-l; Gcc/g ++ in ubuntu 12.04 is 4.6. We will downgrade the default system to 4.4. $ Sudo apt-get install gcc-4.4 $ Sudo update-alternatives -- install/usr/bin/gcc/usr/bin/gc

Install JDK 7u40 in Ubuntu Step 1: Download jdk-7-linux-i586.tar.gz [plain] wget-c http://download.oracle.com/otn-pub/java/jdk/7/jdk-7-linux-i586.tar.gz .) Step 2: unzip and install [plain] sudo tar zxvf. /jdk-7-linux-i586.tar.gz-C/usr/lib/jvm cd/usr/lib/jvm sudo mv jdk1.7.0/java-7-sun Step 3: Modify the environment variable [plain] vim ~ /. Add bashrc: [plain] export JAVA_HOME =/usr/lib/jvm/java-7-sun export JRE_HOME =$ {JAVA_HOME}/jre export CLASSPATH =.: $ {JAVA_HOME}/lib :$ {JRE_HOME}/lib ex

may have the default JDK, such as openjdk, the following work is required to set the installed JDK to the default JDK Version. Run the code: [plain] sudo update-alternatives -- install/usr/bin/java/usr/lib/jvm/java-7-sun/bin/java 300 sudo update-alternatives -- install/ usr/bin/javac/usr/lib/jvm/java-7-sun/bin/javac 300 sudo update-alternatives -- install/usr/bi

current shell then uses SSH to link localhost without having to enter a password.$ ssh localhostInstalling Java$ java -versionIf this command can be correctly viewed in Java version then Java has been fighting for installation, if not, be sure to install Java first. step1: Download java (jdk-*u**-os-x64.tar.gz) here. SETP2: Switch to the folder where Java is located and unzip. $ cd Downloads/ $ tar zxf jdk-7u71-linux-x64.gz $ ls jdk1.7.0_71 jdk-7u71-linux-x64. step3

When configuring Hadoop, there is no JDK found when you format HadoopI used Red Hat is 32-bit, no ready-made 32-bit, hit Java, found that the machine has Java, and found a bit of its locationFound jdk-1.6.0.which Java[email protected] hadoop-1.1.2]# which Java/usr/bin/java[Email protected] hadoop-1.1.2]# Ls/usr/bin/java/usr/bin/java[Email protected] hadoop-1.1.2]# ls-l/usr/bin/javalrwxrwxrwx. 1 root root June 03:00/usr/bin/java-/etc/alternatives/java[

This article was reproduced from: http://blog.csdn.net/lincyang/article/details/42024565Android L recommended using the JDK7 compiler, which is the natural evolution of the law, just like 4 years ago to compile Android 1.6 needs to use JDK5.Multiple versions of the JDK can coexist, and you can switch them at any time using the Update-alternatives tool. The procedures for installing OPENJDK and Oracle JDK (Sun) and switching versions are described belo

reduce Ubuntu Central GCC and g++ version ofThe gcc/g++ in Ubuntu 12.04 are all 4.6, dropping it to 4.4.The procedure is as follows:One, reduce the GCC version1. $sudo Apt-get Install gcc-4.42, $sudo update-alternatives--INSTALL/USR/BIN/GCC gcc/usr/bin/gcc-4.4 40 (where "40" is the priority, the higher the value the higher the priority)3, $sudo update-alternatives--INSTALL/USR/BIN/GCC gcc/usr/bin/gcc-4.6 60

in the configuration Hadoop is, in the format of Hadoop, there is no JDK found I used CENTOS7 is 64 bit, found that the machine has Java, looked for its location found the JDK-1.7.0_75which java[[email protected] Hadoop-1.1.2]# which Java/usr/bin/Java[[email protected] Hadoop-1.1.2]# ls/usr/bin/Java/usr/bin/Java[[email protected] Hadoop-1.1.2]# ls-l/usr/bin/javalrwxrwxrwx.1Root root AJune - Geneva:xx/usr/bin/java-/etc/alternatives/Java[[email protecte

安装环境：ubuntu14.04。JDK不只Oracle一家，但出于习惯问题，我还是选择安装Oracle的JDK。安装方法有两种，一种是通过ppa安装自动配置环境，另一种是下载压缩包解压后自己配置环境。第一种方法比较省事，只是有一个前提：必须上网。第二种方法稍微麻烦一些，有些像在Windows的安装配置。1 Installing using the PPA source method1.1 Adding PPAsudo add-apt-repository Ppa:webupd8team/javasudo apt-get update1.2 Installing Oracle-java-installersudo apt-get install Oracle-java8-installerThe installer will prompt you to agree to Oracle's terms of service, select OK, and then select Yes (note that you want to use the keyboard.) ）。1.3 Set

use the source command to make it effective source ~/. Profile2.4 Change the default JDK version to see the Java version and priority of the system installedsudo update-Alternatives--dispaly Javathe system is installed by default only OPEN-JDK, and the priority is 1051, set a higher priority to Oracle's JDK, such as 1200, in the terminal window to execute the following command:sudo update-Alternatives--

there is openjdk, so, in order to make the default use of the JDK we installed, but also to do the following work.Perform:sudo update-alternatives--install/usr/bin/java Java ~/abc/jdk1.6.0_45/bin/java 300sudo update-alternatives--install/usr/bin/javac javac ~/abc/jdk1.6.0_45/bin/javac 300This step adds our installed JDK to the Java menu.Then execute:sudo update-alterna