Counter.java, Java

Counter.java

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

public class Counter extends JPanel implements ActionListener   // wait for an action
{

private Button upButton = new Button("Add 1");      // create a Button
  
private int counter = 0;
  
    public Counter()
  {
    add(upButton);
    upButton.addActionListener(this);                              // add ActionListener to Button
  }
  
   public void paint( Graphics g ) {
    super.paint(g);                                                           // needed to paint rest of container
    g.drawString("Count: "+counter, 70, 50 );
  }
  
  public void actionPerformed(ActionEvent e) { 
           if (e.getSource() == upButton)                                          // only have one event possible          
                counter = counter + 1;                                                                  repaint();
  }
  
  public static void main()
   {JFrame frame = new JFrame();
    Counter c = new Counter();                                // creates the JPanel
    frame.add(c);
    frame.setSize(400,300);
    frame.setVisible(true);
    frame.repaint();                                                  // wait for events (we only have one event available here)
}
}


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