Java Diyalog Örneği

/* 
This applet demonstrates four easy-to-use routines for 
showing a dialog box and, in three cases, getting back 
some information from the user. The methods are: 

JOptionPane.showMessageDialog 
JOptionPane.showConfirmDialog 
JOptionPane.showInputDialog 
JColorChooser.showDialog 
*/ 

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

public class SimpleDialogDemo extends JApplet implements ActionListener { 

JLabel message; // A label for giving some feedback to the user. 
// It appears at the top of the applet. 

Color selectedColor = Color.gray; // This color will be used as the 
// initial color in the color chooser. 
// It is used to rememeber the user's 
// color choice, so that the color 
// chooser can show the same color, 
// if it is opened twice. 


public **** init() { 
// Set up the applet with a message label and four buttons. 
// Each button will open a different type of dialog. 

setBackground(Color.gray); 
getContentPane().setBackground(Color.gray); 
getContentPane().setLayout( new GridLayout(3,1,3,3) ); 
message = new JLabel("Click a button to open a dialog", JLabel.CENTER); 
message.setForeground(new Color(180,0,0)); 
message.setBackground(Color.white); 
message.setOpaque(true); 
getContentPane().add(message); 

JPanel buttonBar; 
JButton button; 

buttonBar = new JPanel(); 
buttonBar.setLayout(new GridLayout(1,2,3,3)); 
buttonBar.setBackground(Color.gray); 
getContentPane().add(buttonBar); 
button = new JButton("Message Dialog"); 
button.addActionListener(this); 
buttonBar.add(button); 
button = new JButton("Confirm Dialog"); 
button.addActionListener(this); 
buttonBar.add(button); 

buttonBar = new JPanel(); 
buttonBar.setLayout(new GridLayout(1,2,3,3)); 
buttonBar.setBackground(Color.gray); 
getContentPane().add(buttonBar); 
button = new JButton("Input Dialog"); 
button.addActionListener(this); 
buttonBar.add(button); 
button = new JButton("Color Chooser"); 
button.addActionListener(this); 
buttonBar.add(button); 

} // end init() 


public Insets getInsets() { 
// Leave a gray border around the applet. 
return new Insets(3,3,3,3); 
} 


public **** actionPerformed(ActionEvent evt) { 
// Respond to a button click by showing a dialog 
// and setting the message label to describe the 
// user's response. 

String command = evt.getActionCommand(); 

if (command.equals("Message Dialog")) { 
message.setText("Displaying message dialog."); 
JOptionPane.showMessageDialog(null, 
"This is an example of JOptionPane.showMessageDialog."); 
message.setText("You closed the message dialog."); 
} 

else if (command.equals("Confirm Dialog")) { 
message.setText("Displaying confirm dialog."); 
int response = JOptionPane.showConfirmDialog(null, 
"This is an example of JOptioPane.showConfirmDialog.\n" 
+ "Click any button to indicate your response."); 
switch(response) { 
case JOptionPane.YES_OPTION: 
message.setText("You clicked \"Yes\"."); 
break; 
case JOptionPane.NO_OPTION: 
message.setText("You clicked \"No\"."); 
break; 
case JOptionPane.CANCEL_OPTION: 
message.setText("You clicked \"Cancel\"."); 
break; 
case JOptionPane.CLOSED_OPTION: 
message.setText("You closed the box without making a selection."); 
} 
} 

else if (command.equals("Input Dialog")) { 
message.setText("Displaying input dialog."); 
String response = JOptionPane.showInputDialog(null, 
"This is an example of JOptioPane.showInputDialog.\n" 
+ "Type your response, and click a button."); 
if (response == null) 
message.setText("You canceled the input."); 
else if (response.trim().length() == 0) 
message.setText("You left the input box empty."); 
else 
message.setText("You entered \"" + response + "\"."); 
} 

else if (command.equals("Color Chooser")) { 
message.setText("Displaying color chooser dialog."); 
Color c = JColorChooser.showDialog(null,"Select a Color",selectedColor); 
if (c == null) 
message.setText("You canceled without selecting a color."); 
else { 
selectedColor = c; // Remember selected color for next time. 
int r = c.getRed(); 
int g = c.getGreen(); 
int b = c.getBlue(); 
message.setText("You selected RGB = (" + r + "," + g + "," + b + ")."); 
} 
} 

} // end actionPerformed() 


} // end class SimpleDialogDemo