/* COSC 304 section 2
   LUKE BURGESS
   luke_burgess@hotmail.com
   @00205854
   Nov 2 2000 */

// Lab task: Exercises 10.14 and 10.16, page 507 from "Java How To Program", Deitel & Deitel

// Applet that alphabetizes a series of strings entered by the user, and determines number 
// of occurences of a particular character.

import javax.swing.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;

public class Exercises1416p507 extends JApplet implements ActionListener {

   private JLabel stringLabel, charLabel, outputLabel;
   private JTextField stringField, charField;
   private JTextArea output;
   private int charCount;

   public void init() {

      Container c = getContentPane();
      c.setLayout (new FlowLayout());
      c.setBackground(Color.decode("#ccccff"));

      stringLabel = new JLabel ("Enter a String: ");
      stringField = new JTextField (10);
      stringField.addActionListener (this);
      c.add (stringLabel);
      c.add (stringField);

      charLabel = new JLabel ("Enter Character: ");
      charField = new JTextField (9);
      charField.addActionListener (this);
      c.add (charLabel);
      c.add (charField);

      outputLabel = new JLabel ("Sorted Strings:");
      output = new JTextArea (10, 10);
      c.add (outputLabel);
      c.add (output);

   } // init()

   public void actionPerformed (ActionEvent e) {

      if (e.getSource() == stringField) {           // Exercise 10.14

         String newString = stringField.getText();
         String oldString = output.getText();        
         StringTokenizer t = new StringTokenizer (oldString, "\n");

         int count = 0;
         int number = t.countTokens();
         String tokens[] = new String[ number + 1 ];
         stringField.setText ("");
         output.setText ("");
         while (t.hasMoreTokens() && count < number)
            tokens[ count++ ] = t.nextToken();
         tokens[ count ] = newString;
         bubbleSort (tokens);
         for (int k = 0; k < tokens.length; k++)
            output.append (tokens[ k ] + "\n");
      }

      else if (e.getSource() == charField) {        // Exercise 10.16

         charCount = 0;
         String key = e.getActionCommand().toString();
         String s = output.getText();
         int last = -2, current = 0;
         for (int j = -1; j < s.length();) {
            current = s.indexOf (key.charAt(0), ++j);
            if (current != -1 && current != last) {
               last = current;
               charCount++;
            }
         }
         JOptionPane.showMessageDialog (
            null, "Number of " + key.charAt(0) +
            "'s = " + charCount, "Results",
            JOptionPane.INFORMATION_MESSAGE);
      }

   } // actionPerformed()

   private void bubbleSort (String b[]) {
      for (int pass = 1; pass < b.length; pass++)
         for (int i = 0; i < b.length - pass; i++)
            if (b[ i ].compareTo (b[ i + 1 ]) > 0) {
               String hold = b[ i ];
               b[ i ] = b[ i + 1 ];
               b[ i + 1 ] = hold;
            }
   } // bubbleSort()

} // class Exercises1416p507