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I want to know where are the java API's stored. I use openJDK 7. I want to edit some of the code of a class to suit my needs and therefore I want to know where are these API's stored. Can anyone please answer this question?

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So you're looking for the source code, not the API documentation? Wouldn't it make more sense to just extend the class in question? – geirha Jun 30 '12 at 8:03
I want to change the source code only .... i know to extend but i want to change the source code – Pranit Bauva Jun 30 '12 at 8:05
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Do not edit code in the Java API - it will make your installation non-standard. Instead learn how to create subclasses and override the methods you want. – Thorbjørn Ravn Andersen Jun 30 '12 at 9:37

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To get the source code, run (as a regular user, not root)

apt-get source openjdk-7-jre

It will download the source tree used to generate all the openjdk-7 packages. It downloads it to your current directory, so you may want to run something like mkdir -p ~/src && cd ~/src first.

The compressed archive jdk-dfsg.tar.gz at the root of the source tree appears to contain all the standard classes.

You might need to enable source code repositories:

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its coming as "E: You must put some 'source' URIs in your sources.list" Can you please suggest some links ?? – Pranit Bauva Jun 30 '12 at 9:45
@PranitBauva make sure each deb-line in /etc/apt/sources.list also has an identical (apart from the first word) deb-src-line. By default, all the standard repositories should have this, so I'm guessing you've modified your /etc/apt/sources.list at some point. – geirha Jun 30 '12 at 10:01

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