java: sampleoutofbounds exception

Question

I am writing a program for school that reduces noise in a sound file. So far i have written this code which I think takes n number of samples before a set one and n after and then averages the two. My problem is that everytime my second for loop runs i get a sampleoutofboundexception. I am guessing this means that it cant find the sample that i am asking it to look for, but i dont understand why.

for (int s = 0; s<= aSound.getNumSamples(); s++){    

  for ( int i=0; i<=level ; i++ ) {
    nSamp = aSound.getSample(i);
    sSize = nSamp.getValue();
    total=total + sSize;
  }

  for (int j = 0; j >= -level; j--){
    sSize2 = aSound.getSample(j).getValue();
    total1 = total1 + sSize2;
  }
  avg = (total1 + total) / level*2;

  for (int i = 0; i <= level*2+1; i++){
    result.getSample(i).setValue(avg);
  }
 }
 return aSound;
  }

I get the error every single time this line is run and I can't understand why. any help? thank you

sSize2 = aSound.getSample(j).getValue();

I think aSound is a collection, and an array or collection do not have negative index — Javed Akram
– Javed Akram, Commented Nov 13, 2010 at 3:33

casablanca · Accepted Answer · 2010-11-13 03:11:46Z

2

What is the value of level? I'm assuming it's positive, in which case

for (int j = 0; j >= -level; j--)

loops over negative values of j, and negative indices are generally invalid. That's why you're getting an index out of bounds exception.

If this doesn't solve your problem, you should post some more details, such as what type of object aSound is.

answered Nov 13, 2010 at 3:11

casablanca

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2 Comments

Cheesegraterr Over a year ago

level = 5; so my logic that that -level = -5; so 0 > -5 and the loop should run correctly? aSound is an object that holds a wav file with 55125 samples

casablanca Over a year ago

@Cheesegraterr: It should run ok for j = 0, but when you do j--, your j values run through -1, -2, -3, -4, -5 and that's where the trouble begins. You don't have a -1th sample, do you?

Javed Akram · Accepted Answer · 2010-11-13 03:39:15Z

0

aSound is an object that holds a wav file with 55125 samples

As aSound is collection. it don't have negative index as written in my comment

I think aSound is a collection, and an array or collection do not have negative index

answered Nov 13, 2010 at 3:39

Javed Akram

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