setText method with panel and button

Question

I tried fixing this in so many ways, and tried searching for answers everywhere, my color buttons are working, but same way built number buttons do not....

   pa         


        

Answer 1

My button 0 is not working... so i cannot continue writing the code.

You didn't add an ActionListener to the button.

However, before just fixing that problem you should simplify your code an learn how to use loops to create multiple components with the same functionality. Here is an example that creates a single ActionListener and add it to each button:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

public class CalculatorPanel extends JPanel
{
    private JTextField display;

    public CalculatorPanel()
    {
        Action numberAction = new AbstractAction()
        {
            @Override
            public void actionPerformed(ActionEvent e)
            {
//              display.setCaretPosition( display.getDocument().getLength() );
                display.replaceSelection(e.getActionCommand());
            }
        };

        setLayout( new BorderLayout() );

        display = new JTextField();
        display.setEditable( false );
        display.setHorizontalAlignment(JTextField.RIGHT);
        add(display, BorderLayout.NORTH);

        JPanel buttonPanel = new JPanel();
        buttonPanel.setLayout( new GridLayout(0, 5) );
        add(buttonPanel, BorderLayout.CENTER);

        for (int i = 0; i < 10; i++)
        {
            String text = String.valueOf(i);
            JButton button = new JButton( text );
            button.addActionListener( numberAction );
            button.setBorder( new LineBorder(Color.BLACK) );
            button.setPreferredSize( new Dimension(50, 50) );
            buttonPanel.add( button );
        }
    }

    private static void createAndShowUI()
    {
        JFrame frame = new JFrame("Calculator Panel");
        frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        frame.add( new CalculatorPanel() );
        frame.pack();
        frame.setLocationRelativeTo( null );
        frame.setVisible(true);
    }

    public static void main(String[] args)
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowUI();
            }
        });
    }
}

Also, don't use setSize() on your components. The layout manager is responsible for determining the size of a component.

Answer 2

I think you didn't added this as the actionListener of dugmeBroja0:

you need this:

dugmeBroja0.addActionListener(this);

Answer 3

You have never added ActionListener to that button, just to three color buttons and a JTextField polje