Passing data between JFrame & JDialog

[Roshni Singhania]

Hi,

Here's the situation and what I've done so far - I have a JFrame in my program, which is instantiating a JDialog. Each of the two contain a JTextField. When I type in the JDialog's JTextField and press Enter, its text should be passed to JFrame's JTextField. I have tried to solve this in 2 ways. The code that I've written is as follows -

  
//1) interface ICommunicator -
 
interface ICommunicator
{
void setValue(String value);
String getValue();
}
 
//2) class ChildDialog -
 
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
 
class ChildDialog extends JDialog implements ICommunicator
{
JTextField jtf;
String value = "";
 
public ChildDialog(JFrame parent)
{
super(parent);
Container c = getContentPane();
c.setLayout(null);
 
jtf = new JTextField();
jtf.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
System.out.println("setting value: " + jtf.getText());
setValue(jtf.getText());
}
});
 
jtf.setBounds(10, 10, 100, 25);
c.add(jtf);

setSize(300, 200);
setLocation(350, 350);
setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
setVisible(true);
}

public String getValue()
{
return value;
}
 
public void setValue(String value)
{
this.value = value;
}
}
 
//3 class ParentDialog -
 
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
 
public class ParentDialog extends JFrame
{
JTextField jtf;
ChildDialog cd;
 
public ParentDialog()
{
Container c = getContentPane();
c.setLayout(null);
 
jtf = new JTextField();
jtf.setBounds(10, 10, 100, 25);
c.add(jtf);

setSize(500, 400);
setLocation(250, 250);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
 
cd = new ChildDialog(this);
 
/* Way No. 1 */
/*
cd.jtf.addKeyListener(new KeyAdapter()
{
public void keyPressed(KeyEvent ke)
{
if(ke.getKeyCode() == ke.VK_ENTER)
{
//jtf.setText(((ICommunicator) cd).getValue()); //Doesn't Work
jtf.setText(cd.jtf.getText()); //Works
}
}
});
*/
 
/* Way No. 2 (Using an interface) */
/*
String myValue = ((ICommunicator) cd).getValue();
 
while(true)
{
if(myValue.length()==0)
{
try
{
System.out.println("Sleeping");
Thread.sleep(1000);
}
catch(Exception e)
{
System.out.println("Exception " + e);
}
 
System.out.println("Getting The Value...");
myValue = ((ICommunicator) cd).getValue();
}
else
{
break;
}
}
 
jtf.setText(myValue); //Works
*/
}
 
public static void main(String[] args) 
{
new ParentDialog();
}
}

I basically want to wait on JDialog's input before doing further processing. Could someone please advice me as to which one of the above ways is ok? These 2 are the ones I've done so far. Any other ways/suggestions are highly appreciated.

Thanks in advance.

[Michael Dunn]

> When I type in the JDialog's JTextField and press Enter, its text should be passed to JFrame's JTextField.

if you set both textfields to share the same document, no need to press enter

[Roshni Singhania]

Hi,

I didn't know much about the document of the textfield. So I looked it up after reading your reply. It solved my problem. Thanks you very much. You helped a lot.

Originally posted by Michael Dunn:
> When I type in the JDialog's JTextField and press Enter, its text should be passed to JFrame's JTextField.

if you set both textfields to share the same document, no need to press enter