CODEWITHSUNDEEP
javaarrayssortingprocessing
clankill3r
clankill3r

Reputation: 9543

Sort an array instead of an ArrayList

I have an array, not an arrayList and I would like to sort it. This only tells me that Collections are not applicable for the arguments (pixelPlaceSort.Pixel[], ...etc.

Collections.sort(pixels, new PixelComparator());

I could use a List to solve it but for the purpose of learning I don't want that.

So how can this work? c is an int.

class PixelComparator implements Comparator<Pixel> {

  PixelComparator() {
  }

  public int compare(Pixel p1, Pixel p2) {
    if(p1.c < p2.c) {
      return -1; 
    } else if(p1.c > p2.c) {
      return 1; 
    }
    else {
      return 0; 
    }
  }


}

Upvotes: 0

Views: 289

Answers (4)

arthur
arthur

Reputation: 3325

you got 2 options to sort this.

1- Keeping your Array:

your use the sort method of the "Arrays" Class:

Arrays.sort(pixels,new PixelComparator());

2- Using instead a List

you first convert your array to an List and then sort it:

ArrayList<Pixel> pixellist  = new ArrayList<Pixel>(Arrays.asList(pixels));
Collections.sort(pixellist, new PixelComparator());

Upvotes: 0

Amogh Talpallikar
Amogh Talpallikar

Reputation: 12184

For that you have a class called Arrays.

Use Arrays.sort(pixels) Or Arrays.sort(pixels,new PixelComparator())

Check the javadoc for java.util.Arrays and chose the appropriate form of the sort() method.

Upvotes: 1

Nate
Nate

Reputation: 16898

Use the Arrays class - specifically this Arrays.sort() method.

Upvotes: 0

narek.gevorgyan
narek.gevorgyan

Reputation: 4185

you can use Arrays.sort(Object[] array) or Arrays.sort(Object[] array,Comparator c)

Upvotes: 6

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