// Fig. 7.10: BubbleSort.java
// Sort an array's values into ascending order.
import java.awt.*;
import javax.swing.*;

public class BubbleSort extends JApplet {

   // initialize applet 
   public void init()
   {
      JTextArea outputArea = new JTextArea();
      Container container = getContentPane();
      container.add( outputArea );

      int array[] = { 2, 6, 4, 8, 10, 12, 89, 68, 45, 37 };

      String output = "Data items in original order\n";

      // append original array values to String output
      for ( int counter = 0; counter < array.length; counter++ )
         output += "   " + array[ counter ];
 
      bubbleSort( array );  // sort array

      output += "\n\nData items in ascending order\n";

      // append sorted\ array values to String output
      for ( int counter = 0; counter < array.length; counter++ ) 
         output += "   " + array[ counter ];

      outputArea.setText( output );

   } // end method init

   // sort elements of array with bubble sort
   public void bubbleSort( int array2[] )
   {   
      // loop to control number of passes
      for ( int pass = 1; pass < array2.length; pass++ ) { 

         // loop to control number of comparisons
         for ( int element = 0; 
               element < array2.length - 1; 
               element++ ) {

            // compare side-by-side elements and swap them if 
            // first element is greater than second element
            if ( array2[ element ] > array2[ element + 1 ] )
               swap( array2, element, element + 1 );

         } // end loop to control comparisons

      } // end loop to control passes

   } // end method bubbleSort

   // swap two elements of an array
   public void swap( int array3[], int first, int second )
   {
      int hold;  // temporary holding area for swap

      hold = array3[ first ];         
      array3[ first ] = array3[ second ];  
      array3[ second ] = hold;
   }

} // end class BubbleSort


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