JOptionPane Source Code

    The JOptionPane class is not automatically available to your Java programs.The following statement must be before the program’s class header: This statement tells the compiler where to find the JOptionPane class

import javax.swing.JOptionPane;

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

public class JOptionPaneDemo extends JFrame implements ActionListener {
	
	  Container contentPane = null;
	 	
	  private JButton jbnDialog;
	  String ButtonLabels;
	  private JRadioButton[] dialogTypeButtons;
	  private JRadioButton[] messageTypeButtons;
	  private int[] messageTypes =  { JOptionPane.PLAIN_MESSAGE, 
			  JOptionPane.INFORMATION_MESSAGE, JOptionPane.QUESTION_MESSAGE, 
			  JOptionPane.WARNING_MESSAGE, JOptionPane.ERROR_MESSAGE };
	
	  private ButtonGroup messageTypeButtonGroup, buttonTypeButtonGroup,
	                      				dialogTypeButtonGroup;
	  
	  private JRadioButton[] optionTypeButtons;
	  private int[] OptionTypes =  { JOptionPane.DEFAULT_OPTION,  
			  JOptionPane.YES_NO_OPTION, JOptionPane.YES_NO_CANCEL_OPTION,
			  JOptionPane.OK_CANCEL_OPTION };
	  
	  public static void main(String[] args) {
		    new JOptionPaneDemo(); 
	  }
	  
	  public JOptionPaneDemo() {
		  
	    super("JOptionPane Source Demo");
	    addWindowListener(new WindowListener());
	    contentPane = getContentPane();
	    contentPane.setLayout(new GridLayout(0, 1));
	
	    JPanel jplButton = new JPanel();
	    
	    jbnDialog = new JButton("Show an Option Pane");
	    jbnDialog.addActionListener(this);
	    jplButton.add(jbnDialog);
	    contentPane.add(jplButton);
	    
	    createRadioButtonGroupings();
	    
	    ButtonLabels = "Button1 Button2 Button3";
	    
	    pack();
	    setVisible(true);
	  }
	  
	  public void createRadioButtonGroupings(){
		  JPanel jplDialogType = new JPanel();
		    dialogTypeButtonGroup = new ButtonGroup();
		    dialogTypeButtons = 
		      new JRadioButton[] { new JRadioButton("Show Message", true),
		                           new JRadioButton("Get Confirmation"),
		                           new JRadioButton("Collect Input"),
		                           new JRadioButton("Present Options") };
		    
		    for(int i=0; i< dialogTypeButtons.length ; i++){
		    	dialogTypeButtonGroup.add(dialogTypeButtons[i]);
		    	jplDialogType.add(dialogTypeButtons[i]);
		    }
		    contentPane.add(jplDialogType);
	
		    JPanel jplMessageType = new JPanel();
		    messageTypeButtonGroup = new ButtonGroup();
		    messageTypeButtons =
		      new JRadioButton[] { new JRadioButton("Plain"), 
					   new JRadioButton("Information", true),
					   new JRadioButton("Question"), 
					   new JRadioButton("Warning"), 
					   new JRadioButton("Error") };
		    
		    for(int i=0; i< messageTypeButtons.length ; i++){
		    	messageTypeButtonGroup.add(messageTypeButtons[i]);
		    	jplMessageType.add(messageTypeButtons[i]);
		    }
		    contentPane.add(jplMessageType);
		    
		    JPanel jplButtonType = new JPanel();
		    buttonTypeButtonGroup = new ButtonGroup();
		    optionTypeButtons =
		      new JRadioButton[] { new JRadioButton("Default", true), 
					   new JRadioButton("Yes/No"), 
					   new JRadioButton("Yes/No/Cancel"), 
					   new JRadioButton("OK/Cancel") };
		    
		    for(int i=0; i< optionTypeButtons.length ; i++){
		    	buttonTypeButtonGroup.add(optionTypeButtons[i]);
		    	jplButtonType.add(optionTypeButtons[i]);
		    }
		    contentPane.add(jplButtonType);
	
	  }
	  //Windows Listener for Window Closing	
	  public class WindowListener extends WindowAdapter {
		  public void windowClosing(WindowEvent event) {
		    System.exit(0);
		  }
		}
	
	  public void actionPerformed(ActionEvent event) {
		  
		  /*dialogTypeButtons = 
		      new JRadioButton[] { new JRadioButton("Show Message", true),
		                           new JRadioButton("Get Confirmation"),
		                           new JRadioButton("Collect Input"),
		                           new JRadioButton("Present Options") };*/
		  
		    if (dialogTypeButtons[0].isSelected()){
		    	JOptionPane.showMessageDialog(this, "Show Message",
					    "Simple Dialog", getMessageType());
		    }else if (dialogTypeButtons[1].isSelected()) {
			      JOptionPane.showConfirmDialog(this, "Get Confirmation",
			    		  		"Simple Dialog", getButtonType(),
							    getMessageType());
		    }else if (dialogTypeButtons[2].isSelected()) {
			      JOptionPane.showInputDialog(this, "Collect Input",
		    		  		"Simple Dialog", getMessageType(),
						  null, null, null);
		    }else if (dialogTypeButtons[3].isSelected()) {
			      JOptionPane.showOptionDialog(this, "Present Options",
			    		  		"Simple Dialog", getButtonType(),
							   getMessageType(), null,
							   substrings(ButtonLabels),
							   null);
		    }
	  }
	
	  private int getAssociatedType(AbstractButton[] buttons, int[] types) {
		    for(int i=0; i<buttons.length; i++) {
		      if (buttons[i].isSelected()){
		        return(types[i]); 
		      }
		    }
		    return(types[0]);
	  }
	
	  private int getMessageType() {
	    return(getAssociatedType(messageTypeButtons, messageTypes));
	  }
	    
	  private int getButtonType() {
	    return(getAssociatedType(optionTypeButtons, OptionTypes));
	  }
	
	  private String[] substrings(String string) {
	    StringTokenizer tok = new StringTokenizer(string);
	    String[] substrings = new String[tok.countTokens()];
	    for(int i=0; i<substrings.length; i++)
	      substrings[i] = tok.nextToken();
	    return(substrings);
	  }
}

Output

Download JOptionPane Source Code