How to decrease the memory usage??

hi
iam new to java programmning.
I have developed a project using swings.
It is like an IDE to the user where he can create some applications
PROBLEM:After creating some 100 applications it is becoming very slow.
The flow is:
1) Intially launches the JtabbedPane with some panes in it
2) User fills all the details and then clicks on save
3) it saves the application and then prompts the user to create one more application if the user clicks on "yes"
iam doing a cleanup process here that is just assigning all the created objects to null and reinitialising again(acc to requirement)
If the user clicks on "no" just do a cleanup process and removes all the pane from the jtabbedpane
The memory always increases but doesnt decrease...
can anyone suggest..
thanks in advance

There's almost never a reason to call System.gc(), and
there's never a guarantee that it will do anything at
all. It suggests to the VM that now might be a good
time to run gc, but the VM is free to do whatever it
wants with that suggestion, including ignore it.If you look at it that way then there's probably almost never a reason to use advisory file locks either. It's not a strongly enforced policy but it has it's uses all the same.
True, there is no guarantee that it will work but it is in effect a kick aimed at the VM to tell it that maybe some garbage collection would be a good idea.
If you are working with a program that uses large amounts of memory then calling the garbage collector at certain points can help quite a great deal. Have a look at this example:
http://www.devdaily.com/java/edu/pj/pj010008/index.shtml
I agree that watching your references is the way to ensure that objects are scrapped properly. Many classes dont have the convenience of cleanup methods so this can be one of the only ways. You can also check out the java.lang.ref package for further means to interact with the garbage collector.

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