[RESOLVED]HELP!!BitSet set() returns null...

[huiling25]

Does anyone knows why my fingerprint2 is null when I print it out? Here is my code:

 try
{
        FileInputStream input = new FileInputStream ("fp.bin");
        DataInputStream binData = new DataInputStream (input);
	
        BitSet fingerprint2 = new BitSet[3]; //my fp.bin file only consists of 2 binaries
        for(int i=0;i<3;i++)
        {
		for(int j=0;j<1024;j++)
		{
			boolean bit = binData.readBoolean();
			fingerprint2[i].set(j,bit); //something wrong here?
		}
		System.out.println(fingerprint2[i]); //throw NullPointerException
	}
	binData.close();
	input.close();
}
catch(EOFException eof)
{
	
}
catch(NullPointerException npe)
{
	System.out.println("Null Pointer");
}
catch (FileNotFoundException fe)
{
	System.out.println("No such file.");
}
catch (IOException ie)
{
	System.out.println(ie.toString());
}