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I am not sure if you can do this with Java, you can have a full screen application but the user would still be able to close the windows by pressing control + F4 for instance.<br />
<br />
For a full screen windows you can use the <a href="http://docs.oracle.com/javase/tutorial/extra/fullscreen/" rel="ugc">full screen exclusive mode API</a>, or set the preferred size to the <a href="http://stackoverflow.com/questions/2348412/making-a-java-panel-fullscreen" rel="ugc">size of the screen</a>.<br />
<br />
You can also set the default close operation (setDefaultCloseOperation)<wbr /> on the jframe to do nothing on close, so the user won't be able to close the windows on pressing the x button.
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I am not sure if you can do this with Java, you can have a full screen application but the user would still be able to close the windows by pressing control + F4 for instance.

For a full screen windows you can use the full screen exclusive mode API [http://docs.oracle.com/javase/tutorial/extra/fullscreen/], or set the preferred size to the size of the screen [http://stackoverflow.com/questions/2348412/making-a-java-panel-fullscreen].

You can also set the default close operation (setDefaultCloseOperation) on the jframe to do nothing on close, so the user won't be able to close the windows on pressing the x button.

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I still believe you cannot do this with Java. The user will still be able to close it if (s)he starts the task manager. The closest you can get is what Valeri suggested.
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I still believe you cannot do this with Java. The user will still be able to close it if (s)he starts the task manager. The closest you can get is what Valeri suggested.

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ah, yes! girionis is right!<br />
task manager also must be disabled before that, with administrator account.<br />
see how:<br />
<br />
<a href="http://www.windowsnetworking.com/kbase/WindowsTips/WindowsXP/UserTips/Customization/EnableDisableTaskManagerinWindowsXPHomePro.html" rel="ugc">http://www.windowsnetworking.com/kbase/WindowsTips/WindowsXP/UserTips/Customization/EnableDisableTaskManagerinWindowsXPHomePro.html</a><br />
<br />
also valid for windows 7
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ah, yes! girionis is right!
task manager also must be disabled before that, with administrator account.
see how:

http://www.windowsnetworking.com/kbase/WindowsTips/WindowsXP/UserTips/Customization/EnableDisableTaskManagerinWindowsXPHomePro.html [http://www.windowsnetworking.com/kbase/WindowsTips/WindowsXP/UserTips/Customization/EnableDisableTaskManagerinWindowsXPHomePro.html]

also valid for windows 7

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I want to make my java based window form to appear in such a way so that it occupies whole window, and user is not able to minimize or close the application unless he enters his username and password.
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I want to make my java based window form to appear in such a way so that it occupies whole window, and user is not able to minimize or close the application unless he enters his username and password.

How to make the application fix on the desktop.

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.