How to use FilePermission class to change the file permission in Linux

Hi all,
I'm running in a issue related to changing the file permission under Linux environment. I'm using Suse 10.0 Linux and run jdk 1.5 java runtime.
I want to create a file during execution time and change the permission of the same. I use File.createNewFile() API to create file. By default it does not have all the 3 permission (read,write,execute) for all the user ( user,owner,group). Through program I have to change the file permission ( equal to execute ,chmod 777 filename).I donot want to use runtime.exec() with chmod as the argument , since it creates a process to change the permission which may impact the performance. I want to try FilePermission class , by giving filename and permission as the argument. But it is not changing the permission . Could any one faced this problem ?
If any body guides me, how to change the permission of the file under Linux using FilePermission class , it would be helpful.
Thanks,
Sankar

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