[root@oldboy ~]# java -version
java version "1.5.0"
gij (GNU libgcj) version 4.4.7 20120313 (Red Hat 4.4.7-23)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.修改jdk
alternatives --install /usr/bin/java java /usr/java/jdk1.8.0_60/bin/java 300
[root@oldboy ~]# alternatives --config java
There are 4 programs which provide ‘java‘.
Selection Command
-----------------------------------------------
*+ 1 /usr/lib/jvm/jre-1.5.0-gcj/bin/java
2 /usr/java/jdk1.7.0_67-cloudera/bin/java
3 /usr/java/jdk1.7/bin/java
4 /usr/local/jdk1.7/bin/java
Enter to keep the current selection[+], or type selection number: 4切换后
[root@oldboy ~]# java -version
java version "1.7.0_25"
Java(TM) SE Runtime Environment (build 1.7.0_25-b15)
Java HotSpot(TM) 64-Bit Server VM (build 23.25-b01, mixed mode)