Presentation of the card: 2nd card doesn't show text in the TextField

I have a java swing application that implements the map layout and observer template. Basically, in the first map, I key in numbers in the button TextField and click on 'get number', it will run the Calculate class, which returns the number, which then informed his observer who is the Snd class. In the 2nd card (NDS class), it is supposed to set the number passed through the Observable (class Calculate) on the TextField. But my problem is that the textfield on the 2nd map does not appear any text. I already tried the getText method using the print method, and it returns the correct value for the observer last updated. It's just that TextField doesn't show anything. This is executable code.

CardWindow.java

import java.awt.CardLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;


import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;


public class CardWindow {
  private JFrame f;
  private JPanel panel_2;
  private JPanel panel_1;
  private JButton btnNext, btnBack;
  Calculate watched;
  Snd watcher;


  /**
  * Launch the application.
  */
  public static void main(String[] args) {
  EventQueue.invokeLater(new Runnable() {
  public void run() {
  try {
  CardWindow window = new CardWindow();
  window.f.setVisible(true);
  } catch (Exception e) {
  e.printStackTrace();
  }
  }
  });
  }


  /**
  * Create the application.
  */
  public CardWindow() {
  initialize();
  }


  /**
  * Initialize the contents of the frame.
  */
  private void initialize() {
  f = new JFrame();
  f.setBounds(100, 100,500,300);
  f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  f.getContentPane().setLayout(new CardLayout(0, 0));
  panel_1 = new Main_1();
  panel_2 = new Snd();
  f.getContentPane().add(panel_1);
  f.getContentPane().add(panel_2);
  panel_1.setVisible(true);
  panel_2.setVisible(false);
  btnNext = new JButton("Next");
  btnNext.setBounds(300, 100, 161, 29);
  panel_1.add(btnNext);
  btnNext.addActionListener(new ActionListener() {

  public void actionPerformed(ActionEvent e) {
  panel_1.setVisible(false);
  panel_2.setVisible(true);
  System.out.println("Next card");
  }
  });
  btnBack = new JButton("Back");
  btnBack.setBounds(300, 100, 75, 29);
  panel_2.add(btnBack);
  btnBack.addActionListener(new ActionListener() {

  public void actionPerformed(ActionEvent e) {
  panel_2.setVisible(false);
  panel_1.setVisible(true);
  System.out.println("Return previous");
  }
  });
  }
}

Main_1.Java

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;


import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JTextField;


public class Main_1 extends JPanel {
  private static final long serialVersionUID = 1L;
  private JTextField textField;
  private JButton btnCalculate;
  Calculate watched;


  public Main_1() {
  System.out.println("View1()");

setLayout(new FlowLayout());

  textField = new JTextField();
  textField.setBounds(37, 80, 134, 28);
  add(textField);
  textField.setColumns(10);
  btnCalculate = new JButton("Get number");
  btnCalculate.setBounds(47, 131, 117, 29);
  add(btnCalculate);
  btnCalculate.addActionListener(new ActionListener() {
  public void actionPerformed(ActionEvent e) {
  watched = new Calculate();
  watched.calculate(textField.getText());
  }
  });
  }
}

Snd.Java

import java.util.Observable;
import java.util.Observer;

import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JLabel;

public class Snd extends JPanel implements Observer {

 private static final long serialVersionUID = 1L;
  JTextField textField2;
  private Calculate cal;
  private JLabel label;

  Snd() {
  System.out.println("View2()");

setLayout(new FlowLayout());


  textField2 = new JTextField();
  textField2.setBounds(85, 121, 134, 28);
  add(textField2);

  label = new JLabel();
  label.setBounds(129, 200, 61, 16);
  add(label);
  System.out.println("Testing");
  }

  public void update(Observable obs, Object obj) {
  System.out.println ("View      : Observable is " + obs.getClass() + ", object passed is " + obj.getClass());
  cal = (Calculate) obs;
  System.out.println("Update: " + cal.getNum() + " " + obj);
  textField2.setText(Integer.toString(cal.getNum()));
  System.out.println(textField2.isDisplayable());
  System.out.println(textField2.getText());
  label.setText(Integer.toString(cal.getNum()));
  }
}

Calculate.Java

import java.util.Observable;

public class Calculate extends Observable {
 private int abc;

  public Calculate () {
  System.out.println("Model()");
  }

  public void setValue(int num) {
  System.out.println("Initial value: " + abc);
  this.abc = num;
  setChanged();
  System.out.println("Initial notify observer");
  notifyObservers(abc);
  }

  public void calculate(String number) {
  Snd watcher = new Snd();
  addObserver(watcher);
  System.out.println("hasChanged: " + hasChanged());
  abc = Integer.valueOf(number);
  System.out.println("Number: " + abc);
  setChanged();
  System.out.println("hasChanged: " + hasChanged());
  notifyObservers(abc);
  System.out.println("Notify observer");
  }

  public int getNum() {
  return abc;
  }
}

It works for me:

public class CardLayoutTest {

     private static final String SECOND_PANEL = "secondPanel";
     private static final String FIRST_PANEL = "firstPanel";
     private static final CardLayout cardLayout = new CardLayout();

     public static void main(String[] args) {
          final JPanel mainPanel = new JPanel(cardLayout);

          JPanel firstPanel = new JPanel(new FlowLayout());
          JPanel secondPanel = new JPanel(new FlowLayout());

          mainPanel.add(firstPanel, FIRST_PANEL);
          mainPanel.add(secondPanel, SECOND_PANEL);

          final JTextField input = new JTextField(30);
          firstPanel.add(input);
          final JTextField output = new JTextField(30);
          secondPanel.add(output);
          Observer observer = new Observer() {

               @Override
               public void update(Observable o, Object arg) {
                    output.setText(String.format("got value from first panel %s", input.getText()));
               }
          };
          final Observable observable = new Observable(){

               @Override
               public void notifyObservers() {
                    setChanged();
                    super.notifyObservers();
               }

          };
          observable.addObserver(observer);

          firstPanel.add(new JButton(new AbstractAction("toSecondCard") {

               @Override
               public void actionPerformed(ActionEvent arg0) {
                    observable.notifyObservers();
                    cardLayout.show(mainPanel, SECOND_PANEL);
               }
          }));

          secondPanel.add(new JButton(new AbstractAction("back") {

               @Override
               public void actionPerformed(ActionEvent arg0) {
                    input.setText("");
                    cardLayout.show(mainPanel, FIRST_PANEL);
               }
          }));
          JOptionPane.showMessageDialog(null, mainPanel, "CardLayoutTest", JOptionPane.PLAIN_MESSAGE);

     }

}

Good bye

Tags: Java

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