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由于Fedora系统安装的时候会自带OpenJDK，安装完系统后 java -version 会显示
[root@localhost bin]# java -version
java version "1.6.0_22"
OpenJDK Runtime Environment (IcedTea6 1.10.1) (fedora-57.1.10.1.fc15-i386)
OpenJDK Client VM (build 20.0-b11, mixed mode)
如果要自己安装JDK 首先到sun 官网上下载JDK，找到系统对应的版本,我这里下载的是
jdk-6u33-linux-i586-rpm.bin
下载地址：http://www.oracle.com/technetwork/java/javase/downloads/jdk6-downloads-1637591.html
下载完JDK 后，到下载目录给当前用户赋予执行权限
[root@localhost Downloads]# chmod +x jdk-6u33-linux-i586-rpm.bin
终端中输入“./jdk-6u33-linux-i586-rpm.bin”执行解压及安装操作。
[root@localhost Downloads]# ./jdk-6u33-linux-i586-rpm.bin
Unpacking...
Checksumming...
Extracting...
UnZipSFX 5.50 of 17 February 2002, by Info-ZIP ([email protected]).
inflating: jdk-6u33-linux-i586.rpm
inflating: sun-javadb-common-10.6.2-1.1.i386.rpm
inflating: sun-javadb-core-10.6.2-1.1.i386.rpm
inflating: sun-javadb-client-10.6.2-1.1.i386.rpm
inflating: sun-javadb-demo-10.6.2-1.1.i386.rpm
inflating: sun-javadb-docs-10.6.2-1.1.i386.rpm
inflating: sun-javadb-javadoc-10.6.2-1.1.i386.rpm
Preparing... ########################################### [100%]
...................
待提示
Press Enter to continue.....
回车完成JDK 的安装
卸载OpenJDK
---------------------------------------------------------------
1：在终端执行 rpm -qa|grep jdk 此时可以看到系统有两个jdk 如下
[root@localhost bin]# rpm -qa|grep jdk
jdk-1.6.0_33-fcs.i586
java-1.6.0-openjdk-1.6.0.0-57.1.10.1.fc15.i686
2：卸载系统自带的OpenJDK
root@localhost bin]# yum -y remove java java-1.6.0-openjdk-1.6.0.0-57.1.10.1.fc15.i686
Loaded plugins: langpacks, presto, refresh-packagekit
Setting up Remove Process
Resolving Dependencies
--> Running transaction check
---> Package java-1.6.0-openjdk.i686 1:1.6.0.0-57.1.10.1.fc15 will be erased
--> Processing Dependency: java-1.6.0-openjdk >= 1:1.6.0.0-55 for package: icedtea-web-1.0.2-2.fc15.i686
...........
Dependency Removed:
icedtea-web.i686
0:1.0.2-2.fc15
Complete!
配置JDK 环境变量
---------------------------------------------------------------
1：在终端打开profile文件
[root@localhost bin]# vi /etc/profile
2：在profile 文件中增加JDK环境变量
export JAVA_HOME=/usr/java/jdk1.6.0_33
export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH:$HOME/bin
保存并退出
3：使环境变量生效
[root@localhost bin]# source /etc/profile
[root@localhost bin]# java -version
java version "1.6.0_33"
Java(TM) SE Runtime Environment (build 1.6.0_33-b04)
Java HotSpot(TM) Client VM (build 20.8-b03, mixed mode, sharing)
OK，经过以上步骤就完成了JDK 的安装并卸载了Fedora 自带的OpenJDK。