Update Data between Frames

[Jorge Bendahan]

Hi, i can't figure it out how to solve this, the thing is that i have a Frame_A with a JList in it, then another frame: frame_B with a couple of textFields, i call the frame_B from the frame_A, i fill the textFields and the i need to click a Save button and insert the content of the textfields in the Jlist of frame A. Any Ideas.
[ April 25, 2008: Message edited by: Jorge Bend ]

[pete stein]

Hi, i can't figure it out how to solve this, the thing is that i have a Frame_A with a JList in it, then another frame: frame_B with a couple of textFields, i call the frame_B from the frame_A, i fill the textFields and the i need to click a Save button and insert the content of the textfields in the Jlist of frame A. Any Ideas.

1) Are these JFrames and are you using JTextFields? I'm just making sure that you're not mixing Swing and AWT components.
2) Consider using a JDialog or JOptionPane for your second "frame". It just seems to me to be a more natural fit here, plus you can make it modal or not if need be.
3) There are many ways to answer this. Remember that class A and class B are like any other classes despite their being inherited from Swing components. They can have private variables with public getters and setters and all that. One way to solve this is to have a public methods in class B that gets your data, say getStringA and getStringB. When the object of class B is done doing its thing, the object of class A can then call B's public methods to get this data. Here is a very simplistic example that uses a JOptionPane:

ClassA.java

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
 
public class ClassA extends JFrame
{
    private JTextField textfieldA1 = new JTextField(10);
    private JTextField textfieldA2 = new JTextField(10);
    
    public ClassA()
    {
        super("Class A");
        textfieldA1.setEditable(false);
        textfieldA2.setEditable(false);
        
        JButton openB = new JButton("Open B");
        openB.addActionListener(new ActionListener()
        {
            @Override
            public void actionPerformed(ActionEvent e)
            {
                ClassB objectB = new ClassB();  // *** here's the ClassB object
                int result = JOptionPane.showConfirmDialog(ClassA.this,
                        objectB, "Class B", JOptionPane.OK_CANCEL_OPTION,
                        JOptionPane.PLAIN_MESSAGE);
                if (result == JOptionPane.OK_OPTION)
                {
                    textfieldA1.setText(objectB.getString1());
                    textfieldA2.setText(objectB.getString2());
                }
                
            }
        });
        
        JPanel mainPanel = new JPanel();
        mainPanel.add(openB);
        mainPanel.add(textfieldA1);
        mainPanel.add(textfieldA2);
        getContentPane().add(mainPanel);
    }
 
    private static void createAndShowUI()
    {
        JFrame frame = new ClassA();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
 
    public static void main(String[] args)
    {
        java.awt.EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowUI();
            }
        });
    }
}

ClassB.java

import javax.swing.JPanel;
import javax.swing.JTextField;
 
public class ClassB extends JPanel
{
    private JTextField textfieldB1 = new JTextField(10);
    private JTextField textfieldB2 = new JTextField(10);
    
    public ClassB()
    {
        add(textfieldB1);
        add(textfieldB2);
    }
    
    public String getString1()
    {
        return textfieldB1.getText();
    }
 
    public String getString2()
    {
        return textfieldB2.getText();
    }
 
}

[ April 25, 2008: Message edited by: pete stein ]

[Jorge Bendahan]

Great answer, was really helpfull!, I'm getting there..., another thing is that actually, there are 2 textFields and 1 comboBox in that JPane,after filling the info, I put all the text of these components together in a String variable and then return it to the frame A, put this incoming String in an Array and then have to pass it to a Jlist, setListData(myVar); but the JList it's not showing the text..

[Jorge Bendahan]

wait now it's solved.. great help Thank!