Jdk 6.0 update 6 installed sucessfully but java command not working

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http://askubuntu.com – I switched to linux (Ubuntu 12.04) this morning and find it great but messed up while installing java. :-(. I have installed jdk6.0_6 successfully but when I run java command in terminal, I get this ravi@ravi-LIFEBOOK-AH531:~$ java The program 'java' can be found in the following packages: * default-jre * gcj-4.6-jre-headless * openjdk-6-jre-headless * gcj-4.5-jre-headless * openjdk-7-jre-headless Try: sudo apt-get install <selected package> Could someone help me with this ? Below are the steps that I followed to install : copied file named jdk-6u6-linux-x64.bin to my docu (HowTos)