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Look at line 35 in the your source and see what variable is null. Then backtrack in the code to see why that variable does not have a valid value.
If you can not tell which variable it is, add a...

What compiler are you using? I get this warning when I compile your code:
warning: [empty] empty statement after if

Can you post the output from your program that shows the problem? Add comments to the output that shows what the problem is and also show what the output should be.

Add some printlns to the...