Java Text Field of form to new form

Question

I'm new in Java, just want to ask a simple question I have my first form and a text field, I input a text there the once I click the button a new form will come out and the Text in the text Field will be come a Label the the new form

I try this code but it doesn't work

public class Data extends javax.swing.JFrame {

  public Data() {
    initComponents();

    FrmLogIn f = new FrmLogIn();
    User.setText(f.UName.getText());
    User.setVisible(true);
}

Swing? For better help sooner, post an [SSCCE](http://sscce.org/). — Andrew Thompson, Feb 12 '13 at 04:45
I just need to get the text in the other form in the textbox — kelvzy, Feb 12 '13 at 04:51
1) Again, post an SSCCE. That code would not compile. 2) See [The Use of Multiple JFrames, Good/Bad Practice?](http://stackoverflow.com/a/9554657/418556) 3) *"doesn't work"* Is as useful in helping us to diagnose the problem as a screen door is on the ISS. What did you expect to happen? What happened instead? — Andrew Thompson, Feb 12 '13 at 05:00
for example.. Log In form when I log-in a new form will open and say, "Welcome, Username" — kelvzy, Feb 12 '13 at 05:02

score 2 · Answer 1 · answered Feb 12 '13 at 06:58

There are many ways you could tackle this problem. You could create your own JDialog to handle the input requirements (and I probably would in most cases), but if you're after something a little simpler, JOptionPane provides a ready made dialog which is highly configurable.

enter image description here

There's, of course, nothing stopping you from mixing the two concpets (customized JDialog and JOptionPane)

public class TestLogin01 {

    public static void main(String[] args) {
        new TestLogin01();
    }

    public TestLogin01() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (Exception ex) {
                }


                LoginPane loginPane = new LoginPane();

                String userName = null;
                boolean validUser = false;
                int result = JOptionPane.CANCEL_OPTION;
                do {
                    result = JOptionPane.showConfirmDialog(null, loginPane, "Login", JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE);
                    switch (result) {
                        case JOptionPane.OK_OPTION:
                            // Verify user details..
                            userName = loginPane.getUserName();
                            char[] password = loginPane.getPassword();

                            // Simple random test...
                            validUser = ((int) (Math.round(Math.random() * 1))) == 0 ? true : false;
                            if (!validUser) {
                                JOptionPane.showMessageDialog(null, "Inavlid username/password", "Error", JOptionPane.ERROR_MESSAGE);
                            }
                            break;
                    }
                } while (!validUser && result != JOptionPane.CANCEL_OPTION);

                if (result == JOptionPane.OK_OPTION) {
                    if (validUser) {
                        JOptionPane.showMessageDialog(null, "Welcome back valued user " + userName, "Welcome", JOptionPane.INFORMATION_MESSAGE);
                    }
                }
            }
        });
    }

    public class LoginPane extends JPanel {

        private JTextField userName;
        private JPasswordField passwordField;

        public LoginPane() {
            userName = new JTextField(10);
            passwordField = new JPasswordField(10);

            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.anchor = GridBagConstraints.WEST;

            add(new JLabel("User name: "), gbc);
            gbc.gridy++;
            add(new JLabel("Password: "), gbc);

            gbc.gridy = 0;
            gbc.gridx++;
            gbc.fill = GridBagConstraints.HORIZONTAL;

            add(userName, gbc);
            gbc.gridy++;
            add(passwordField, gbc);
        }

        public String getUserName() {
            return userName.getText();
        }

        public char[] getPassword() {
            return passwordField.getPassword();
        }
    }
}

You might like to have a read through How to create GUIs with Swing and How to use dialogs for more information.

exexzian · Answer 2 · 2013-02-12T06:45:00.497

1

seeing your code, it seems that you have not included event handling part(and you need to include that to get your work done)

as an brief introduction you need to do this in your code:

button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                FrmLogIn f = new FrmLogIn();
                            User.setText(f.UName.getText());
                            f.setVisible(true);
                }
 }

Note: assuming User is an JLabel and UName an JTextField
and FrmLogIn has extended JFrame and you have set required fields like layout and size of the JFrame

for more info about event-handling look up here

Edit 2:

sample code snippet - you want something like this ( its just a rough one to give you an idea how to move ahead wtih)

edit 3
as commented by @madProgrammer - replaced null layout by FlowLayout

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.*;
import javax.swing.JTextField;


class FrmLogIn extends JFrame{
    JLabel User;

    public FrmLogIn()  {
        setLayout(new FlowLayout());
        setSize(200,200);
        User = new JLabel("");
       // User.setBounds(20,30,100,40);
        add(User);
        setVisible(true);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

}

class ForTest extends JFrame{
   JButton enter;
   JTextField UName;

    public ForTest()  {
     setLayout(new FlowLayout());
     setSize(300,300);

     enter = new JButton("enter");
     //enter.setBounds(20,20,100,30);
     UName = new JTextField();
     //UName.setBounds(40,80,60,30);
     add(UName);
     add(enter);
     setVisible(true);
     enter.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    FrmLogIn f = new FrmLogIn();
                                f.User.setText(UName.getText());
                                f.setVisible(true);
                                setVisible(false);
                    }
     }); 

     setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
      new ForTest();
    }
}

edited Feb 12 '13 at 06:45

answered Feb 12 '13 at 05:01

exexzian

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for example "Log In Form" when i log in my username, a new form will come open and says, "Welcome Username," in the label i put – kelvzy Feb 12 '13 at 05:07
we got your point but its hard to predict what you have done and which part you want - check update – exexzian Feb 12 '13 at 05:10
Yes, I use your code.. what happen is the log in form also came out.. but my jlabel in the welcome form still dont appear – kelvzy Feb 12 '13 at 05:28
@kelvzy wait a min? User is JLabel or JTextField? – exexzian Feb 12 '13 at 05:30
@kelvzy and have you set the bounds of `JLabel` and added it to the Frame – exexzian Feb 12 '13 at 05:31
User is jLabel in the 2nd form and UName is my text field in the 1st form – kelvzy Feb 12 '13 at 05:33
so my UName = textfield is in the Login and my User= jLabel is in the Welcome form – kelvzy Feb 12 '13 at 05:44
woah thanks... but I try this codes String Namer = FrmLogIn.UName.getText(); User.setText(Namer); – kelvzy Feb 12 '13 at 06:33
@kelvzy yeah thats your personal choice but you dont need to use `Namer` you can directly set it in setText – exexzian Feb 12 '13 at 06:34
@MadProgrammer though layout was not the actual problem of OP so I left that as `null` now edited with `FlowLayout` - hope now you can - revoke your downvote – exexzian Feb 12 '13 at 06:46
@sansix I'm sure I can be pursued ;) - Always good to present appropriate practices where we can (I know, I'm old and picky ;)) – MadProgrammer Feb 12 '13 at 06:59
@MadProgrammer haha agreed :) – exexzian Feb 12 '13 at 07:02

Java Text Field of form to new form

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