import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

/* When the user clicks on the Go button, any text in the
  textarea is processed by dividing it up into words separated
  by spaces.  Then these words are put in a vector and then
  put into a string in reverse order.
  The string is displayed on a canvas.
  However, if the user types the word Java somewhere in the
  middle of a sentence, a special string is printed and no
  reversing is performed.

  This program illustrates the following Java mechanisms:
    Use of a TextArea object.
    Creation of a subclass of Canvas in order to associate
      a special paint method with it.
    Use of a button to control the processing of text input.
*/

public class TextTestApplet extends Applet
    implements ActionListener {

    TextArea ta;
    TTACanvas ttaCanvas;
    Button goButton;
    String displayString = "Hi there! Type a sentence in the textarea!";

    public void init() {
	setLayout(new BorderLayout());
	ta = new TextArea(5,20);
	ttaCanvas = new TTACanvas();
	goButton = new Button("Go");
	ttaCanvas.setSize(300,200);
	add(ta, BorderLayout.NORTH);
	add(ttaCanvas, BorderLayout.CENTER);
	add(goButton, BorderLayout.SOUTH);
	ttaCanvas.setString(displayString);
	goButton.addActionListener(this);
    }

    public void actionPerformed(ActionEvent e) {
	if (e.getSource() == goButton)  {
	    StringTokenizer st = new StringTokenizer(ta.getText(), " ");
	    Vector words = new Vector();
	    while (st.hasMoreTokens()) {
		String thisWord = st.nextToken();
		if (thisWord.equals("Java")) {
		    displayString = "You said the magic word -- Java.";
		    ttaCanvas.setString(displayString);
		    ttaCanvas.repaint();
		    return;
		}
		words.addElement(thisWord);
	    }
	    // Now create a reversed list of words.
	    displayString = "";
	    for (Enumeration enum = words.elements(); enum.hasMoreElements();) {
		displayString = enum.nextElement() + " " + displayString;
	    }
	    ttaCanvas.setString(displayString);
	    ttaCanvas.repaint();
	}

    }

}