如何用新安装的jdk替换掉Linux系统默认jdk

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系统自带的JDK

[root@master ~]# java -versionjava version "1.5.0"gij (GNU libgcj) version 4.4.7 20120313 (Red Hat 4.4.7-3)Copyright (C) 2007 Free Software Foundation, Inc.This is free software; see the source for copying conditions.  There is NOwarranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

自己配置的jdk

[hadoop@master ~]$ echo $JAVA_HOME/usr/java/jdk1.8.0_60

但是系统默认的用的是系统自带的jdk，下面切换到安装的jdk版本

[root@master ~]# alternatives --install /usr/bin/java java /usr/java/jdk1.8.0_60/bin/java 300[root@master ~]# alternatives --config javaThere are 2 programs which provide 'java'.  Selection    Command-----------------------------------------------*+ 1           /usr/lib/jvm/jre-1.5.0-gcj/bin/java   2           /usr/java/jdk1.8.0_60/bin/javaEnter to keep the current selection[+], or type selection number: 2

系统自带的jdk时，是带gij的，输入java命令如下：

[root@master ~]# java -versionjava version "1.5.0"gij (GNU libgcj) version 4.4.7 20120313 (Red Hat 4.4.7-3)Copyright (C) 2007 Free Software Foundation, Inc.This is free software; see the source for copying conditions.  There is NOwarranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

自己安装的jdk，输入java命令如下：

[root@master ~]# java -versionjava version "1.8.0_60"Java(TM) SE Runtime Environment (build 1.8.0_60-b27)Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)

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