How to Handle the memory in JAVA??

Hello,
I created one Editor using swing concepts. And I am openeing a file ( 8MB ).For that I am using a Sting Buffer in my program ( for reading the file)...But If I open multiple files in my Editor .... its taking so much time..
so for that I have to clear in STRING BUFFER memory..
SO GIVE ME SOME IDEA FOR THAT..
HOW CAN I HANDLE THAT MEMORY FOR THAT??
Thanks and Regards,
Bala

One thing you can do, is to allocate more memory to the JVM. The following JVM switch would use 256MB of RAM:
java -Xmx256m

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