Java : Wait for user input on swing window [duplicate]

Answer 1

You could use a modal dialog to get user input, the dialog will block the code execution at the point it is made visible and continue when it's made invisible (it's magic), have a look at How to Make Dialogs for more details

Updated

The modal dialog will only block the Event Dispatching Thread (technically it doesn't block it, it simply circumvents it), see Initial Threads for more details

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Arrays;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import net.miginfocom.swing.MigLayout;

public class MainClass {

    private char[] password;
    private String pin;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                System.out.println("Before Window");
                Window w = new Window();
                System.out.println("After Window");
                System.out.println(w.getPin() + Arrays.toString(w.getPassword()) + '1');
            }
        });
    }

    public static class Window extends JDialog {

        private JTextField textField_1;
        private JButton btnNewButton;
        private JPanel panel;
        private JPasswordField passwordField;
        private char[] password = new char[10];
        private String pin;

        public Window() {

            this.setModal(true);
            this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
            this.setLocationRelativeTo(null);
            this.setSize(370, 150);
            this.setForeground(new Color(192, 192, 192));
            this.setTitle("Access Password Manager");
            this.setResizable(false);

            panel = new JPanel();
            getContentPane().add(panel, BorderLayout.CENTER);
            panel.setLayout(new MigLayout("", "[70.00][132.00,grow][44.00][67.00,grow][61.00][]", "[19.00][34.00][]"));

            JLabel lblNewLabel = new JLabel("Password");
            panel.add(lblNewLabel, "cell 0 1,alignx trailing,aligny center");

            passwordField = new JPasswordField();
            passwordField.setColumns(13);
            panel.add(passwordField, "cell 1 1,alignx center");

            JLabel lblNewLabel_1 = new JLabel("Key");
            panel.add(lblNewLabel_1, "cell 2 1,alignx center,aligny center");

            textField_1 = new JTextField();
            panel.add(textField_1, "cell 3 1,alignx left,aligny center");
            textField_1.setColumns(4);

            btnNewButton = new JButton("Log In");
            ListenForButton listener = new ListenForButton();

            btnNewButton.addActionListener(listener);
            panel.add(btnNewButton, "cell 4 1");

            this.setVisible(true);

        }

        private class ListenForButton implements ActionListener {

            @Override
            public void actionPerformed(ActionEvent e) {

                if (e.getSource() == btnNewButton) {

                    if (passwordField.getPassword().length < 10) {

                        password = passwordField.getPassword().clone();
                    }

                    pin = textField_1.getText();

                }
            }
        }

        public char[] getPassword() {
            return password;
        }

        public String getPin() {
            return pin;
        }

    }
}

Answer 2

you should be using events. your main class could listen for an event, if the button in the window is pressed. e.g.

public static void main(String[] args) {
   Window w = new Window();  
   w.getBtnNewButton().addActionListener(new ActionListener(){
      @Override
      public void actionPerformed(ActionEvent e) {
         System.out.println(w.getPin() + Arrays.toString(w.getPassword()) +  '1');
      }
   });  
}

in this case you have to make a public getter for the button, so you can access it from the main class.

Answer 3

If you want the result to be printed on button click, then you could print it in the button's action listener. If you want it to be printed as soon as user enters anything, you can add action listeners to your password text field.

Window / View

public class Window extends JFrame{

  private Controller controller;
  private Model model;

  public Window(Controller controller, Model model) {
    this.controller = controller;
    this.model = model;
  }

Model

public class Model {

  private String password;
  //getters and setters
}

Controller

public class Controller {

  public void doSomething() {
    // do anything. Views could invoke controller methods to do things and is usually invoked when certain events happen.
  }

Main

public class Main {

  public static void main(String[] args) {
    new Window(new Controller(), new Model());
  }