public class BubbleSort2 {

  void bubble (int[] data, int startingPosition)
  {
    // Swap down the element that belongs in "startingPosition".
    for (int j=data.length-1; j > startingPosition; j--) {
      if (data[j-1] > data[j])
        swap (data, j-1, j);
      }
  }
  

  public void sortInPlace (int[] data)
  {
    // Key idea: Bubble smallest element, then next smallest etc.

    // 1. For positions 0,...,length-1, find the element that belongs there:
    for (int i=0; i < data.length-1; i++){
      bubble (data, i);
    }
  }
  
  void swap (int[] data, int i, int j)
  {
    int temp = data[i];
    data[i] = data[j];
    data[j] = temp;
  }

  //////////////////////////////////////////////////////////////////////
  // Testing.

  public static void main (String[] argv)
  {
    BubbleSort2 bSort = new BubbleSort2 ();
    int totalTests = 10;
    int dataSize = 100;
    int[] data = new int [dataSize];
    for (int ntests=0; ntests < totalTests; ntests++) {
      // Create the data:
      for (int i=0; i < dataSize; i++)
        data[i] = (int) UniformRandom.uniform ( (int) 1000, (int) 10000);
      // Sort:
      bSort.sortInPlace (data);
      // Check:
      boolean ok = true;
      for (int i=0; i < dataSize-1; i++)
        if (data[i] > data[i+1])
          ok = false;
      if (! ok) {
        System.out.println ("Failure detected for test#" + ntests);
        System.exit (0);
      }
    }
    System.out.println ("Passed");
  }

}