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[taro@localhost ~]$ wget -O jdk-7u4-linux-i586.rpm --no-cookies --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F" "http://download.oracle.com/otn-pub/java/jdk/7u4-b20/jdk-7u4-linux-i586.rpm"

[taro@localhost ~]$ su -
パスワード:
[root@localhost ~]# rpm -ivh /home/taro/jdk-7u4-linux-i586.rpm
準備中...                ########################################### [100%]
   1:jdk                    ########################################### [100%]
Unpacking JAR files...
        rt.jar...
        jsse.jar...
        charsets.jar...
        tools.jar...
        localedata.jar...
        plugin.jar...
        javaws.jar...
        deploy.jar...
[root@localhost ~]# exit
logout

[taro@localhost ~]$ which javac
/usr/bin/javac
[taro@localhost ~]$ javac -version
javac 1.7.0_04

[taro@localhost ~]$ which java
/usr/bin/java
[taro@localhost ~]$ java -version
java version "1.7.0_04"
Java(TM) SE Runtime Environment (build 1.7.0_04-b20)
Java HotSpot(TM) Client VM (build 23.0-b21, mixed mode, sharing)

CentOS release 5.7 (Final)
CentOS release 6.2 (Final)