Heap Sort Program in Java

Source Code for Heap Sort Program in Java

// Heap sort program


public class HeapSort {

   public static void main(String args[]) {

     int[] x =
     {597, 21, 523, 1378, 243, 774, 14, 93, 510, 5, 67, 23};

     System.out.println("Unsorted list: ");
     display(x);

     heapSort(x);
     System.out.println("Sorted list: ");
     display(x);
   }

   private static void heapSort(int x[]) {

     int n = x.length;

     int i, elt, s, f, ivalue, pass=1;

     for (i=1; i<n; i++) {

       elt = x[i];
       s = i;
       f = (s-1)/2;

       while((s>0) && (x[f]<elt)) {
         x[s] = x[f];
         s = f;
         f = (s-1)/2;
       }

       x[s] = elt;
     }

     for (i=n-1; i>0; i--) {

       ivalue = x[i];
       x[i] = x[0];
       f = 0;

       if (i==1)
         s=-1;

       else
         s=1;

       if((i>2) && (x[2]>x[1]))
         s=2;

       while((s>=0) && (ivalue<x[s])) {

         x[f] = x[s];
         f = s;

         s = 2*f+1;

         if ((s+1 <= i-1) && (x[s]<x[s+1]))
           s = s+1;

         if (s>(i-1))
           s=-1;
       }
       x[f] = ivalue;
       System.out.println("Pass "+(pass++)+": ");
       display(x);
     }
   }


   private static void display(int x[]) {
     for (int i=0; i<x.length; i++)
       System.out.print(x[i] + " ");
     System.out.println("\n");
   }
}

Output of Heap Sort Program of Java

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