button colors, etc.

hi everyone. i am still fairly new to java, and after creating this SMALL calculator program, id like to change the colors of the buttons, and perhaps the background. if anyone can help me out here it would be greatly appreciated. thanks a lot.

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

public class Calculator extends JFrame implements ActionListener
{
    JTextField num1 = new JTextField("00.00");
    JTextField num2 = new JTextField("00.00");
    
    JLabel answer = new JLabel("00.00");
    JLabel symbol = new JLabel("...");
    JLabel equals = new JLabel("=");
    
    JButton additionButton = new JButton(" + ");
    JButton subtractionButton = new JButton(" - ");
    JButton divisionButton = new JButton(" / ");
    JButton multiplicationButton = new JButton(" * ");
    JButton clearButton = new JButton(" clr! ");
    JButton aboutButton = new JButton( "about!" );
    JButton exitButton = new JButton(" exit!" );

JFrame calcFrame = new JFrame("Calculator!");
 
    
    public Calculator()
    {

JPanel fields = new JPanel(new FlowLayout());
        fields.add(num1);
        fields.add(symbol);
        fields.add(num2);
        fields.add(equals);
        fields.add(answer);
        
        JPanel buttons = new JPanel();
        buttons.setLayout(new BoxLayout(buttons, BoxLayout.X_AXIS));
        buttons.add(additionButton);
        buttons.add(subtractionButton);
        buttons.add(divisionButton);
        buttons.add(multiplicationButton);
        buttons.add(clearButton);

JPanel moreButtons = new JPanel(new FlowLayout());
        moreButtons.add(aboutButton);
        moreButtons.add(exitButton);
      
        getContentPane().setLayout(new BorderLayout());
        getContentPane().add("North", fields);
        getContentPane().add("Center", buttons);
        getContentPane().add("South", moreButtons);
        
        additionButton.addActionListener(this);
        subtractionButton.addActionListener(this);
        divisionButton.addActionListener(this);
        multiplicationButton.addActionListener(this);
        clearButton.addActionListener(this);
        exitButton.addActionListener(this);
        pack();
        setVisible(true);
 
        calcFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
        aboutButton.addActionListener(new AboutListener());
 
        clearButton.setMnemonic(KeyEvent.VK_C);
        aboutButton.setMnemonic(KeyEvent.VK_A);
        exitButton.setMnemonic(KeyEvent.VK_E);
    }
 
    public void actionPerformed(ActionEvent e)
    {
        double x = Double.parseDouble(num1.getText());
        double y = Double.parseDouble(num2.getText());
        if (e.getSource() == additionButton)
        {
            answer.setText(String.valueOf( x + y ));
            symbol.setText("+");
        }
        if (e.getSource() == subtractionButton)
        {
            answer.setText(String.valueOf( x - y ));
            symbol.setText("-");
        }
        if (e.getSource() == divisionButton)
        {
            answer.setText(String.valueOf( x / y ));
            symbol.setText("/");
        }
        if (e.getSource() == multiplicationButton)
        {
            answer.setText(String.valueOf( x * y ));
            symbol.setText("*");
        }
        if (e.getSource() == clearButton)
        {
            answer.setText("00.00");
            symbol.setText("...");
            num1.setText("00.00");
            num2.setText("00.00");
        }
        if (e.getSource() == exitButton)
        {
            System.exit(0);
        }
 
    }

public class AboutListener implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      JFrame popUp = new JFrame("About frame");
      popUp.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
      popUp.setSize(250,200);
      MyPanel panel = new MyPanel();
      popUp.getContentPane().add(panel);
      popUp.setVisible(true);
    }
    public class MyPanel extends JPanel {
      public void paintComponent(Graphics g) {
        int width = this.getWidth();
        int height = this.getHeight();
        g.setColor(Color.black);
        g.fillRect(0, 0, width, height);
        g.setColor(Color.green);
        g.drawString("^_^, a ken zemaitis production.", width/4, height/2);
      }
    }
  }
 
    public static void main(String args[])
    {
        Calculator f = new Calculator();
    }
}

-ken zemaitis.

if you're talking about ALL buttons

Originally posted by Michael Dunn:
if you're talking about ALL buttons
public static void main(String args[]) { UIManager.put("Button.background",new javax.swing.plaf.ColorUIResource(Color.YELLOW)); Calculator f = new Calculator(); }

for some reason when i inserted into my program, nothing changed. im not sure if there is something else i need to set up, however, i couldnt figure it out. :X

dis you add the UIManager line as the first line in main()?

Originally posted by Michael Dunn:
dis you add the UIManager line as the first line in main()?

definitely not.

Originally posted by ken zemaitis:

definitely not.

YIKES! i misread that, i did do that, and still the buttons look generic.

works OK on 1.4.0_01, so the problem could be in your L & F.

in the constructor, add this for one of the buttons

additionButton.setContentAreaFilled(false);
additionButton.setOpaque(true);

recompile/run see if additionButton's background changes

Originally posted by Michael Dunn:
works OK on 1.4.0_01, so the problem could be in your L & F.

in the constructor, add this for one of the buttons

additionButton.setContentAreaFilled(false);
additionButton.setOpaque(true);

recompile/run see if additionButton's background changes

holy sweet mother it works. i thought i had tried this before however obviously i must have screwed it up. you saved the day. thanks a lot.