Full process of jdk installation in ubuntu

Sudochmodu + x/usr/lib/jvm/java/jdk1.6.0 _ 12. binsudo/usr/lib/jvm/java/jdk1.6.0 _ 12. binsudovi/etc/environmentPATH = & quot ;...... :/usr/lib/jvm/java/jdk1.6.0 _ 12/bin & quot sudo chmod u + x/usr/lib/jvm/java/jdk1.6.0 _ 12.bin
 
 
Sudo/usr/lib/jvm/java/jdk1.6.0 _ 12.bin
 
 
Sudo vi/etc/environment
 
 
PATH = "......:/usr/lib/jvm/java/jdk1.6.0 _ 12/bin"
CLASSPATH =.:/usr/lib/jvm/java/jdk1.6.0 _ 12/lib
JAVA_HOME =/usr/lib/jvm/java/jdk1.6.0 _ 12
 
 
Sudo source/home/ghoul/. bashrc
 
 
At this time, the environment variables are successfully set (there are many ways to set the environment variables, not to list them one by one)
Because ubuntu may have a default jdk, such as openjdk, we need to perform the following work to make the jdk installed by default.
Run
Update-alternatives -- install/usr/bin/java/usr/lib/jvm/java/jdk1.6.0 _ 12/bin/java 300
Update-alternatives -- install/usr/bin/javac/usr/lib/jvm/java/jdk1.6.0 _ 12/bin/javac 300
In this step, add the installed jdk to the java menu.
Then execute
Update-alternatives -- config java
 
In this step, select the default jdk
In this way, enter
Java-version