DialogDemo.java

// Demonstrate Dialog box.
import java.awt.*;
import java.awt.event.*;
import java.applet.*;

/*
<applet code="DialogDemo" width=250 height=250>
</applet>
*/

// Create a subclass of Dialog.

class SampleDialog extends Dialog implements ActionListener 
{
	SampleDialog(Frame parent, String title) 
	{
		super(parent, title, false);
		setLayout(new FlowLayout());
		setSize(300, 200);
		add(new Label("Press this button:"));
		Button b;
		add(b = new Button("Cancel"));
		b.addActionListener(this);
	}
	public void actionPerformed(ActionEvent ae)
	{
		dispose();
	}
	public void paint(Graphics g) 
	{
		g.drawString("This is in the dialog box", 10, 70);
	}
}
// Create a subclass of Frame.
class MenuFrame extends Frame 
{
	String msg = "";
	CheckboxMenuItem debug, test;
	MenuFrame(String title) 
	{
		super(title);
		// create menu bar and add it to frame
		MenuBar mbar = new MenuBar();
		setMenuBar(mbar);
		// create the menu items
		Menu file = new Menu("File");
		MenuItem item1, item2, item3, item4;
		file.add(item1 = new MenuItem("New..."));
		file.add(item2 = new MenuItem("Open..."));
		file.add(item3 = new MenuItem("Close"));
		file.add(new MenuItem("-"));
		file.add(item4 = new MenuItem("Quit..."));
		mbar.add(file);
		Menu edit = new Menu("Edit");
		MenuItem item5, item6, item7;
		edit.add(item5 = new MenuItem("Cut"));
		edit.add(item6 = new MenuItem("Copy"));
		edit.add(item7 = new MenuItem("Paste"));
		edit.add(new MenuItem("-"));
		Menu sub = new Menu("Special", true);
		MenuItem item8, item9, item10;
		sub.add(item8 = new MenuItem("First"));
		sub.add(item9 = new MenuItem("Second"));
		sub.add(item10 = new MenuItem("Third"));
		edit.add(sub);
		// these are checkable menu items
		debug = new CheckboxMenuItem("Debug");
		edit.add(debug);
		test = new CheckboxMenuItem("Testing");
		edit.add(test);
		mbar.add(edit);
		// create an object to handle action and item events
		MyMenuHandler handler = new MyMenuHandler(this);
		// register it to receive those events
		item1.addActionListener(handler);
		item2.addActionListener(handler);
		item3.addActionListener(handler);
		item4.addActionListener(handler);
		item5.addActionListener(handler);
		item6.addActionListener(handler);
		item7.addActionListener(handler);
		item8.addActionListener(handler);
		item9.addActionListener(handler);
		item10.addActionListener(handler);
		debug.addItemListener(handler);
		test.addItemListener(handler);
		// create an object to handle window events
		MyWindowAdapter adapter = new MyWindowAdapter(this);
		// register it to receive those events
		addWindowListener(adapter);
	}
	public void paint(Graphics g) 
	{
		g.drawString(msg, 10, 200);
		if(debug.getState())
		{
			g.drawString("Debug is on.", 10, 220);
		}
		else
		{
			g.drawString("Debug is off.", 10, 220);
		}
		if(test.getState())
		{
			g.drawString("Testing is on.", 10, 240);
		}
		else
		{
			g.drawString("Testing is off.", 10, 240);
		}
	}
}
class MyWindowAdapter extends WindowAdapter 
{
	MenuFrame menuFrame;
	public MyWindowAdapter(MenuFrame menuFrame) 
	{
		this.menuFrame = menuFrame;
	}
	public void windowClosing(WindowEvent we) 
	{
		menuFrame.dispose();
	}
}
class MyMenuHandler implements ActionListener, ItemListener 
{
	MenuFrame menuFrame;
	public MyMenuHandler(MenuFrame menuFrame) {
	this.menuFrame = menuFrame;
	}
	// Handle action events
	public void actionPerformed(ActionEvent ae) {
	String msg = "You selected ";
	String arg = (String)ae.getActionCommand();
	// Activate a dialog box when New is selected.
	if(arg.equals("New...")) {
	msg += "New.";
	SampleDialog d = new
	SampleDialog(menuFrame, "New Dialog Box");
	d.setVisible(true);
	}
	// Try defining other dialog boxes for these options.
	else if(arg.equals("Open..."))
	msg += "Open.";
	else if(arg.equals("Close"))
	msg += "Close.";
	else if(arg.equals("Quit..."))
	msg += "Quit.";
	else if(arg.equals("Edit"))
	msg += "Edit.";
	else if(arg.equals("Cut"))
	msg += "Cut.";
	else if(arg.equals("Copy"))
	msg += "Copy.";
	else if(arg.equals("Paste"))
	msg += "Paste.";
	else if(arg.equals("First"))
	msg += "First.";
	else if(arg.equals("Second"))
	msg += "Second.";
	else if(arg.equals("Third"))
	msg += "Third.";
	else if(arg.equals("Debug"))
	msg += "Debug.";
	else if(arg.equals("Testing"))
	msg += "Testing.";
	menuFrame.msg = msg;
	menuFrame.repaint();
	}
	public void itemStateChanged(ItemEvent ie) {
	menuFrame.repaint();
	}
}
// Create frame window.
public class DialogDemo extends Applet {
Frame f;
public void init() {
f = new MenuFrame("Menu Demo");
int width = Integer.parseInt(getParameter("width"));
int height = Integer.parseInt(getParameter("height"));
setSize(width, height);
f.setSize(width, height);
f.setVisible(true);
}
public void start() {
f.setVisible(true);
}
public void stop() 
{
f.setVisible(false);
}
}