Download Java JDK or JRE from

http://www.oracle.com/technetwork/java/javase/index-137561.html

JRE is only for running Java Programs. JDK can compile Java Source code and run it. So if you plan to make Java Program, download JDK.

Download Link for 32 Bit JDK on 19 May 2011 is

http://download.oracle.com/otn-pub/java/jdk/6u25-b06/jdk-6u25-linux-i586-rpm.bin

So download it with wget

wget http://download.oracle.com/otn-pub/java/jdk/6u25-b06/jdk-6u25-linux-i586-rpm.bin

If file get saved as different name, rename it to jdk-6u25-linux-i586-rpm.bin

Now execute it with sh ./jdk-6u25-linux-i586-rpm.bin

[root@sam ~]# sh ./jdk-6u25-linux-i586-rpm.bin
Unpacking...
Checksumming...
Extracting...
UnZipSFX 5.50 of 17 February 2002, by Info-ZIP ([email protected]).
  inflating: jdk-6u25-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%]
   1:jdk                    ########################################### [100%]
Unpacking JAR files...
        rt.jar...
        jsse.jar...
        charsets.jar...
        tools.jar...
        localedata.jar...
        plugin.jar...
        javaws.jar...
        deploy.jar...
Installing JavaDB
Preparing...                ########################################### [100%]
   1:sun-javadb-common      ########################################### [ 17%]
   2:sun-javadb-core        ########################################### [ 33%]
   3:sun-javadb-client      ########################################### [ 50%]
   4:sun-javadb-demo        ########################################### [ 67%]
   5:sun-javadb-docs        ########################################### [ 83%]
   6:sun-javadb-javadoc     ########################################### [100%]

Java(TM) SE Development Kit 6 successfully installed.

Product Registration is FREE and includes many benefits:
* Notification of new versions, patches, and updates
* Special offers on Oracle products, services and training
* Access to early releases and documentation

Product and system data will be collected. If your configuration
supports a browser, the JDK Product Registration form will
be presented. If you do not register, none of this information
will be saved. You may also register your JDK later by
opening the register.html file (located in the JDK installation
directory) in a browser.

For more information on what data Registration collects and
how it is managed and used, see:
http://java.sun.com/javase/registration/JDKRegistrationPrivacy.html

Press Enter to continue.....


Done.
[root@sam ~]#

To check where java installed, run

[root@sam ~]# which java
/usr/bin/java
[root@sam ~]#

To check Java Version

[root@sam ~]# java -version
java version "1.6.0_25"
Java(TM) SE Runtime Environment (build 1.6.0_25-b06)
Java HotSpot(TM) Server VM (build 20.0-b11, mixed mode)
[root@sam ~]#