I am fairly new to Java. Benn working with C++ for years. I created a class call MessageBox extended from Frame and implementing actionListener. I want to basically istantiate this class with the same parameters as in VisualBasic. ex. MessageBox( <message>, type of dialog, title). Type of dialog being OK, Yes/No...... No problem for OK sice it does not return a value. With Yes/no type, I want to retrun a value. I see no way of doing that. Any ideas?
Thanks,
Joey

Joey Picinich

Hi,

The JOptionPane class in the javax.swing package does exactly what you need (http://java.sun.com/j2se/1.4.1/docs/...ptionPane.html).
You can show a dialog using JOptionPane.showOptionDialog(), which takes a number of parameters for the text, button type etc.

If you want to do your own class for this, you could use a similar idea. You can download the source code for Java from the Sun site, couldn't find exactly where, try http://wwws.sun.com/software/java2/download.html

Regards
Philip

Hi I apologise for my english.

But I believe that I can help you

Frame Dialogo= new Frame();
FileDialog d = new FileDialog(Dialogo,"Abrir Encuesta");
d.setVisible(true);
String fname=d.getFile();

This is a java code for open file. If you modify this code, for example add 2 buttons in frame.
After you must create action listener events for buttons.

Other java code for ErrorMessage or ErrorDialog is follow

import java.awt.*;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: </p>
 * @author Eduardo Bieñkowski
 * @version 1.0
 */

public class ErrorDialog extends Dialog {
public ErrorDialog(Frame parent, boolean modal)
    {
        super(parent, modal);

        // components to the visual environment. It instantiates and initializes
        // the components. To modify the code, only use code syntax that matches
        // what Visual Cafe can generate, or Visual Cafe may be unable to back
        // parse your Java file into its visual environment.

        //{{INIT_CONTROLS
        setLayout(null);
        setVisible(false);
        setSize(249,150);
        setBackground(new Color(-4198403));
        label1 = new java.awt.Label();
        label1.setBounds(40,35,166,21);
        label1.setBackground(new Color(-4198403));
        add(label1);
        okButton = new java.awt.Button();
        okButton.setLabel("OK");
        okButton.setBounds(95,85,66,27);
        okButton.setBackground(new Color(12632256));
        add(okButton);
        setTitle("About");
        //}}

        //{{REGISTER_LISTENERS
        SymWindow aSymWindow = new SymWindow();
        this.addWindowListener(aSymWindow);
        SymAction lSymAction = new SymAction();
        okButton.addActionListener(lSymAction);
        //}}

    }

    public ErrorDialog(Frame parent, boolean modal, String titulo)
    {
        super(parent, modal);
//es la copia del constructor del visualcafe pero con el título de la etiqueta para agregarlo

        //{{INIT_CONTROLS
        setLayout(null);
        setVisible(false);
        setSize(249,150);
        setBackground(new Color(-4198403));
        label1 = new java.awt.Label(titulo);
        label1.setBounds(40,35,166,23);
        label1.setBackground(new Color(-4198403));
        add(label1);
        okButton = new java.awt.Button();
        okButton.setLabel("OK");
        okButton.setBounds(95,85,66,27);
        okButton.setBackground(new Color(12632256));
        add(okButton);
        setTitle("Error");
        //}}

        //{{REGISTER_LISTENERS
        SymWindow aSymWindow = new SymWindow();
        this.addWindowListener(aSymWindow);
        SymAction lSymAction = new SymAction();
        okButton.addActionListener(lSymAction);
        //}}

    }

    public ErrorDialog(Frame parent, String title, boolean modal)
    {
        this(parent, modal);
        setTitle(title);
    }

    public void addNotify()
    {
        // Record the size of the window prior to calling parents addNotify.
                Dimension d = getSize();

        super.addNotify();

        // Only do this once.
        if (fComponentsAdjusted)
            return;

        // Adjust components according to the insets
        setSize(getInsets().left + getInsets().right + d.width, getInsets().top + getInsets().bottom + d.height);
        Component components[] = getComponents();
        for (int i = 0; i < components.length; i++)
        {
            Point p = components[i].getLocation();
            p.translate(getInsets().left, getInsets().top);
            components[i].setLocation(p);
        }

        // Used for addNotify check.
        fComponentsAdjusted = true;
    }

    public void setVisible(boolean b)
    {
        if (b)
        {
            Rectangle bounds = getParent().getBounds();
            Rectangle abounds = getBounds();

            setLocation(bounds.x + (bounds.width - abounds.width)/ 2,
                 bounds.y + (bounds.height - abounds.height)/2);
        }

        super.setVisible(b);
    }

    //{{DECLARE_CONTROLS
    java.awt.Label label1;
    java.awt.Button okButton;
    //}}

        // Used for addNotify check.
    boolean fComponentsAdjusted = false;

    class SymWindow extends java.awt.event.WindowAdapter
    {
        public void windowClosing(java.awt.event.WindowEvent event)
        {
            Object object = event.getSource();
            if (object == ErrorDialog.this)
                AboutDialog_WindowClosing(event);
        }
    }

    void AboutDialog_WindowClosing(java.awt.event.WindowEve nt event)
    {
                dispose();
    }

    class SymAction implements java.awt.event.ActionListener
    {
        public void actionPerformed(java.awt.event.ActionEvent event)
        {
            Object object = event.getSource();
            if (object == okButton)
                okButton_Clicked(event);
        }
    }

    void okButton_Clicked(java.awt.event.ActionEvent event)
    {
        //{{CONNECTION
        // Clicked from okButton Hide the Dialog
                dispose();
        //}}
    }


}


regards
Eduardo since Uruguay

[email protected]

Edduardo B.
Montevideo
Uruguay

When I tried to create a GUI, I would like to add each actionListener to each component, the efficiency is no obvious difference between one function and multiple functions(each has one like buttons or whatever). As I felt, it is more convinient for you and other programmer to maintain your codes.
Your idea is to create a Dialog to display information, type and options? Isn't it? If that, you can use JOptionPane (it is the way java offers).
A great help for us is Java API Specification. It is quite helpful!
(I am also a beginner, I 'd like to hear any experience from you guys.)

hi pic_az

philip is right, best way is to use JOptionPane.
JOptionPane has 4 methods you can use.

1.) showMessageDialog //no return-value
2.) showConfirmDialog // returns an integer-value
3.) showOptionDialog // returns an integer-value
4.) showInputDialog //returns a String

here is little example:
/**
*Creates an Dialog-Frame with OK and CANCEL Button, an the an WARNING-
*Symbol.
*/
int selection = JOptionPane.showConfirmDialog(parent, "//your message", "//Dialog-Title", JOptionPane.OK_CANCEL_OPTION, JOptionPane.WARNING_MESSAGE);
if(selection == JOptionPane.OK_OPTION){
//what is to do when the OK-Button is pressed
}


/**
*Creates an Dialog-Frame with OK Button, an the an WARNING-
*Symbol. No Return-Value!
*/
JOptionPane.showConfirmDialog(parent, "//your message", "//Dialog-Title", JOptionPane.WARNING_MESSAGE);

more possible Message-Types are:
JOptionPane.ERROR_MESSAGE
JOptionPane.INFORMATION_MESSAGE
JOptionPane.QUESTION_MESSAGE
JOptionPane.PLAIN_MESSAGE

ok that´s all

my english is not the best, greetings from Berlin (Germany)