Install JDK in Ubuntu and set it to the default JDK

Install JDK 1.6 in Ubuntu and set it as the default JDK. download the Liunx JDK in Windows, and I will download the jdk-6u43-linux-i586.bin2. upload JDK to Ubuntu3. manually install JDK through secureCRT (I installed JDK under/usr/local/bin/jdk1.6.0 _ 43): repair first... install JDK 1.6 in Ubuntu and set it to the default JDK 1. download the Liunx JDK in Windows, my jdk-6u43-linux-i586.bin2. upload JDK to Ubuntu3. manually install JDK through secureCRT (I installed under/usr/local/bin/jdk1.6.0 _ 43): first modify the permission sudo chmod u + x jdk-6u43-linux-i586.bin to install sudo-s. /jdk-6u43-linux-i586.bin4. configure environment variables to open profi Le file sudo nano/etc/profile add # author ylchou # date 2013-06-23export JAVA_HOME =/usr/local/bin/jdk1.6.0 _ 43 export CLASSPATH = "at the bottom of the file ".: $ JAVA_HOME/lib: $ CLASSPATH "export PATH =" $ JAVA_HOME/: $ PATH "5. manually set the system default JDK and enter the following commands on the terminal: sudo update-alternatives -- install/usr/bin/java/usr/local/bin/jdk1.6.0 _ 43/bin/java 300 sudo update-alternatives -- install/usr/bin/javac javac/usr/local/bin/jdk1.6.0 _ 43/bin/javac 300sud O update-alternatives -- install/usr/bin/jar/usr/local/bin/jdk1.6.0 _ 43/bin/jar 300 sudo update-alternatives -- install/usr/bin/javah javah/usr/local/bin/jdk1.6.0 _ 43/bin/javah 300 sudo update-alternatives -- install/usr/bin/javap/usr/local/bin/jdk1.6.0 _ 43/ bin/javap 300 and then execute the following code to select the JDK version we have installed: sudo update-alternatives -- config java6. verify that JDK is installed successfully. Restart the Shell terminal and run "java-version". if you enter the following command, the installation is successful: java version "1.6.0 _ 43" Java (TM) SE Runtime Environment (build 1.6.0 _ 43-b01) Java HotSpot (TM) Client VM (build phases 14-b01, mixed mode, sharing)