How to force garbage collection Java Interview

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How can you force garbage collection ?

What's the difference between J2SDK 1.5 and J2SDK 5.0 ?
There's no difference, Sun Microsystems just re-branded this version. 

Can I catch statements for FileNotFoundException and IOExceptipon without any order ?
No, You can't . The FileNoFoundException is inherited from the IOException. Exception's subclasses have to be caught first.