AWTHomework4

package awtHomework4;
import java.awt.*;
import java.awt.event.*;

public class AWTHomework4 extends Frame implements ActionListener {

    CheckboxGroup grp1 = new CheckboxGroup();
    CheckboxGroup grp2 = new CheckboxGroup();
    Checkbox ascending = new Checkbox("Ascending", grp1, true);
    Checkbox descending = new Checkbox("Descending", grp1, false);
    Checkbox s1 = new Checkbox("Step 1", grp2, true);
    Checkbox s5 = new Checkbox("Step 5", grp2, false);
    Checkbox s10 = new Checkbox("Step 10", grp2, false);
    int res = 0;
    Label result = new Label( ""+res, Label.RIGHT);
    Button clickMe = new Button("ClickMe!");
    Button clear = new Button("Clear!");
    Panel west = new Panel(new GridLayout(0,1));
    Panel center = new Panel();
    Panel east = new Panel(new GridLayout(0,1));

    public AWTHomework4() {
        west.add( ascending);
        west.add( descending);
        west.add(new Label());
        west.add( s1);
        west.add( s5);
        west.add( s10);

        clickMe.addActionListener(this);
        clear.addActionListener(this);
        east.add( clickMe);
        east.add( result);
        east.add( clear);

        this.add( west, BorderLayout.WEST);
        this.add( center, BorderLayout.CENTER);
        this.add( east, BorderLayout.EAST);
        this.setTitle("ButtonCounterDemo");
        this.setSize(300, 150);
        this.setVisible(true);
        this.addWindowListener(new ExitProgram());
    }

    public void actionPerformed(ActionEvent e) {
        Button x = (Button)e.getSource();
        if(x.equals(clickMe)) {
            if(s1.getState()) {
                if(ascending.getState()) res += 1;
                else res -= 1;
                result.setText( ""+res );
            }
            if(s5.getState()) {
                if(ascending.getState()) res += 5;
                else res -= 5;
                result.setText( ""+res );
            }
            if(s10.getState()) {
                if(ascending.getState()) res += 10;
                else res -= 10;
                result.setText( ""+res );
            }
        }
        if(x.equals(clear)) {
            res = 0;
            result.setText( ""+res);
        }
    }

    public static void main(String [] args) {
        new AWTHomework4();
    }
}

class ExitProgram extends WindowAdapter {
    public void windowClosing( WindowEvent e ) {
        System.exit(0);
    }
}