public class OpenFrame extends JFrame implements ActionListener {

    private static final int WIDTH = 500;
    private static final int HEIGHT = 500;
    private BudgetPlanner budgetPlanner;
    private JLabel welcomeMessage;
    private JPanel openpanel = new JPanel();

    private JButton loadButton = new JButton();
    private JButton resetButton = new JButton();
    private JFrame openFrame;
    private JLabel getWelcomeMessage;

    public BudgetPlanner callBudgetPlanner() {
        try {
            budgetPlanner = new BudgetPlanner();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return budgetPlanner;
    }

    public OpenFrame() {
        openFrame = new JFrame();
        openFrame.setTitle("BudgetPlanner");
        openFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        openFrame.setResizable(false);
        openFrame.setLayout(null);
        openFrame.setLocationRelativeTo(null);
        openFrame.setSize(new Dimension(WIDTH, HEIGHT));
        openFrame.getContentPane().setBackground(Color.GRAY);
        openPanel();
        openFrame.setContentPane(openpanel);

        openFrame.setVisible(true);
    }

    public void openPanel() {
        openpanel.setLayout(null);

        welcomeMessage = new JLabel("Hello there! Welcome back. Choose an option below:");
        welcomeMessage.setVerticalTextPosition(TOP);
        welcomeMessage.setHorizontalTextPosition(SwingConstants.CENTER);
        welcomeMessage.setBounds(50, 20, 500, 200);
        welcomeMessage.setFont(new Font("Arial", Font.PLAIN, 17));

        openpanel.setBounds(0, 0, 500, 500);
        openpanel.add(welcomeMessage);

        loadButton.setBounds(200, 170, 100, 50);
        loadButton.setFont(new Font("Arial", Font.CENTER_BASELINE, 15));
        loadButton.setText("Load Data");
        loadButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                LoadCompletePanel loadCompletePanel = new LoadCompletePanel();
                openpanel.add(loadCompletePanel);
            }
        });
        loadButton.setFocusable(false);

        resetButton.setBounds(200, 230, 100, 50);
        resetButton.setFont(new Font("Arial", Font.CENTER_BASELINE, 15));
        resetButton.setText("Reset Data");
        resetButton.addActionListener(this);
        resetButton.setFocusable(false);

        openpanel.add(loadButton);
        openpanel.add(resetButton);
    }

Above is my code, and I have an issue. I would like to call a new panel (made in a separate class) by clicking on loadButton, but it doesn't seem to work - nothing happens even if I click on the button.

How should I fix this? By the way, below is the code for a new panel:

public class LoadCompletePanel extends JPanel implements ActionListener {

    private BudgetPlanner budgetPlanner;
    private JPanel loadCompletePanel;
    private JLabel loadCompleteMessage;
    private JButton addExpense;
    private JButton addIncome;
    private JButton viewMonthlyExpense;
    private JButton viewMonthlyIncome;

    public LoadCompletePanel() {
        loadCompletePanel = new JPanel();
        loadScreenPanel();
        loadCompletePanel.add(loadCompleteMessage);
        loadCompletePanel.setBounds(200, 170, 100, 50);
        setVisible(true);

    }

    private void loadScreenPanel() {
        loadCompletePanel.setLayout(null);
        loadCompleteMessage = new JLabel("Loading Complete.");
        loadCompleteMessage.setBounds(130, 50, 500, 200);

    }

Sorry if this is a very trivial & basic question. I'm still a beginner at Java. Any help would be appreciated.

CodePudding user response：

Do the following:

 public void actionPerformed(ActionEvent e) {
     LoadCompletePanel loadCompletePanel = new LoadCompletePanel();
     openpanel.add(loadCompletePanel);
     openPanel.repaint();
     openPanel.revalidate();
 }

This code will make sure that the panel paints the newly added components.

CodePudding user response：

Since I'm not familiar with setLayout(null) associated with setBounds(...) and I haven't been doing Swing for a long time, I never managed to display the LoadCompletePanel instance even directly. Anyway as the problem is in the action listener I replaced the loadCompletePanel panel with the LoadindCompleteLabel label. For this label to appear in the action listener, you must invoke repaint() on the effected container.

    public void openPanel() {
    openpanel.setLayout(null);

    welcomeMessage = new JLabel("Hello there! Welcome back. Choose an option below:");
    welcomeMessage.setVerticalTextPosition(SwingConstants.TOP);
    welcomeMessage.setHorizontalTextPosition(SwingConstants.CENTER);
    welcomeMessage.setBounds(50, 20, 500, 200);
    welcomeMessage.setFont(new Font("Arial", Font.PLAIN, 17));

    openpanel.setBounds(0, 0, 500, 500);
    openpanel.add(welcomeMessage);
    openpanel.add(loadCompletePanel);
    
    
    JLabel LoadindCompleteLabel = new JLabel("Loading Complete.");
    LoadindCompleteLabel.setBounds(130, 50, 500, 200);

    
    loadButton.setBounds(200, 170, 100, 50);
    loadButton.setFont(new Font("Arial", Font.CENTER_BASELINE, 15));
    loadButton.setText("Load Data");
    loadButton.addActionListener(new ActionListener() {
        
        public void actionPerformed(ActionEvent e) {
            openpanel.add(LoadindCompleteLabel);
            openpanel.repaint();
        }
        
    });
    
    loadButton.setFocusable(false);

    resetButton.setBounds(200, 230, 100, 50);
    resetButton.setFont(new Font("Arial", Font.CENTER_BASELINE, 15));
    resetButton.setText("Reset Data");
    resetButton.addActionListener(this);
    resetButton.setFocusable(false);

    openpanel.add(loadButton);
    openpanel.add(resetButton);
}