CentOS 6.5修改JDK环境

[xhhuang@node3 Desktop]$ sudo alternatives --config java
[sudo] password for xhhuang:

There is 1 program that provides 'java'.

Selection    Command
-----------------------------------------------
*+ 1           /usr/lib/jvm/jre-1.5.0-gcj/bin/java

Enter to keep the current selection[+], or type selection number: 1
[xhhuang@node3 Desktop]$ ls -l /usr/java/
total 4
lrwxrwxrwx 1 root root   16 Jul  9 18:37 default -> /usr/java/latest
drwxr-xr-x 8 root root 4096 Jul  9 18:37 jdk1.7.0_67
lrwxrwxrwx 1 root root   21 Jul  9 18:37 latest -> /usr/java/jdk1.7.0_67

[xhhuang@node3 Desktop]$ sudo alternatives --install /usr/bin/java java /usr/java/jdk1.7.0_67/bin/java 3 --slave /usr/bin/javac javac /usr/java/jdk1.7.0_67/bin/java
[xhhuang@node3 Desktop]$ sudo alternatives --config java

There are 2 programs which provide 'java'.

Selection    Command
-----------------------------------------------
*+ 1           /usr/lib/jvm/jre-1.5.0-gcj/bin/java
2           /usr/java/jdk1.7.0_67/bin/java

Enter to keep the current selection[+], or type selection number: 2
[xhhuang@node3 Desktop]$ java -version
java version "1.7.0_67"
Java(TM) SE Runtime Environment (build 1.7.0_67-b01)
Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)
[xhhuang@node3 Desktop]$ touch note.txt
[xhhuang@node3 Desktop]$

sudo alternatives --config java

sudo alternatives --install /usr/bin/java java /usr/java/jdk1.7.0_67/bin/java 3 --slave /usr/bin/javac javac /usr/java/jdk1.7.0_67/bin/java