import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
/**
 * Find the largest in a set of numbers
 *
 * @author Mr J
 * @version 20040223
 */
public class FindLargest extends Applet implements ActionListener
{
	// awt objects
	private TextArea display = new TextArea(12, 50);
	private Button pressMe = new Button("Press me!");
	private Label messages = new Label("Any messages will appear here");

    // data members
    static final int SIZE = 6;
    private int[] numbers = {2, 56, -2, 99, 3, 4};
	/** 
	 * Add objects to the Applet
	 */
	public void init()
	{
        add(display);
        add(pressMe);
        add(messages);
        // Causes button presses to be detected
        pressMe.addActionListener(this);
	}
	/** 
	 * When an event occurs on an object with an ActionListener attached, this
	 * method is carried out.  
	 * 
	 * @param e carries details about the event that occurred
	 */
		public void actionPerformed(ActionEvent e)
	{
	    // algorithm to find and display largest item in array
	    int largest = numbers[0];
	    int pos = 1;
	    while (pos < SIZE)
	    {
	      display.append(  "Looking at array element: " + pos 
	                     + " value: " + numbers[pos] + "\n");
	      display.append("largest is now: " + largest + "\n");
	      
	      if (numbers[pos] > largest)
	      {
	          largest = numbers[pos];
	          display.append("largest just changed to: " + largest + "\n");
	      }
	      pos = pos + 1;
	    }
	    messages.setText("The largest value is: " + largest);
	}
}