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());
}

[r035198x]

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());
}

From a quick look I'd say, try so that you initialize the array first

BitSet fingerprint2 = new BitSet[3]; 
for(int i = 0; i < fingerprint2.length;i++ ) {
   fingerprint2[i] = new BitSet();
}
....
.. 

because the line

fingerprint2[i].set(j,bit); 

is the one throwing a null pointer exception

[huiling25]

From a quick look I'd say, try so that you initialize the array first

BitSet fingerprint2 = new BitSet[3]; 
for(int i = 0; i < fingerprint2.length;i++ ) {
   fingerprint2[i] = new BitSet();
}
....
.. 

because the line

fingerprint2[i].set(j,bit); 

is the one throwing a null pointer exception

I tried your suggestion, but nothing was printed out. Here is how i put it:

BitSet fingerprint2 = new BitSet[3]; 
for(int i=0;i<counter;i++)
{
    fingerprint2[i] = new BitSet();
    for(int j=0;j<1024;j++)
    {
        boolean bit = binData.readBoolean();    
        fingerprint2[i].set(j,bit);         
    }
    System.out.println(fingerprint2[i]);    //nothing was printed out
}

[r035198x]

I tried your suggestion, but nothing was printed out. Here is how i put it:

BitSet fingerprint2 = new BitSet[3]; 
for(int i=0;i<counter;i++)
{
    fingerprint2[i] = new BitSet();
    for(int j=0;j<1024;j++)
    {
        boolean bit = binData.readBoolean();    
        fingerprint2[i].set(j,bit);         
    }
    System.out.println(fingerprint2[i]);    //nothing was printed out
}

Then you are definitely getting an EndOfFileException.

Change your catch statements from

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());
}

to

catch(EOFException eof)
{
    System.out.println("End of File Exception");
}
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());
}

And see if this isn't true.

[huiling25]

Then you are definitely getting an EndOfFileException.

Change your catch statements from

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());
}

to

catch(EOFException eof)
{
    System.out.println("End of File Exception");
}
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());
}

And see if this isn't true.

Thanks, it work out already. =)

[r035198x]

Thanks, it work out already. =)

What did you do then?