解决linux下javac -version和java -version版本显示不一致

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[root@localhost usr]# $JAVA_HOME/bin/java -version 
bash: /bin/java: 没有那个文件或目录 
[root@localhost java]# . /etc/profile 
[root@localhost java]# . /etc/profile 
[root@localhost java]# $JAVA_HOME/bin/java -version 
java version "1.6.0_20" 
Java(TM) SE Runtime Environment (build 1.6.0_20-b02) 
Java HotSpot(TM) Client VM (build 16.3-b01, mixed mode, sharing) 
[root@localhost java]# which java   //就是这个地方，擦！用的是/usr/bin/下面的java。
/usr/bin/java 
[root@localhost java]# mv /usr/bin/java /usr/bin/oldjava
[root@localhost java]# ln -s $JAVA_HOME/bin/java /usr/bin/java 
[root@localhost java]# 
[root@localhost java]# java -version 
java version "1.6.0_20" 
Java(TM) SE Runtime Environment (build 1.6.0_20-b02) 
Java HotSpot(TM) Client VM (build 16.3-b01, mixed mode, sharing) 
[root@localhost java]# 
[root@localhost java]# javac -version 
javac 1.6.0_20