linux 下查看jdk版本

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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