What are pre-requisite softwares to be installed to start working JAVA?

HI ALL,
Greetings.
Would you pls. let me know what are pre-requisite softwares to be installed to start learning with JAVA? I have completed OCA certification and now i want to start learning JAVA so that i can develop front end database application. I have no other language experience other than PL/SQL.
Pls. let me know what the primary and essential softwares to be installed to start learning java to suit my desired objective as mentioned above.
Thanks in advance.

Follow this trail - http://java.sun.com/docs/books/tutorial/getStarted/ .

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