Who can help me :)--a problem with java program(reset problem in java )

Question

I do not know how to make the button reset,my program only could reset diagram but button.If any one who could help me to solve this problem.The problem is When the reset button is pressed, the image should immediately revert to the black square, and the 4 widgets listed above should show values that
correspond to the black square.The code like this,first one is shapes:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class shapes extends JFrame {
     private JPanel buttonPanel; // panel for buttons
     private DrawPanel myPanel;  // panel for shapes
     private JButton resetButton;
    private JComboBox colorComboBox;
     private JRadioButton circleButton, squareButton;
     private ButtonGroup radioGroup;
     private JCheckBox filledButton;
    private JSlider sizeSlider;
     private boolean isShow;
     private int shape;
     private boolean isFill=true;
    private String colorNames[] = {"black", "blue", "cyan", "darkGray", "gray",
                               "green", "lightgray", "magenta", "orange",
                               "pink", "red", "white", "yellow"};   // color names list in ComboBox
    private Color colors[] = {Color.black, Color.blue, Color.cyan, Color.darkGray,
                          Color.gray, Color.green, Color.lightGray, Color.magenta,
                          Color.orange, Color.pink, Color.red, Color.white, Color.yellow};
     public shapes() {
         super("Draw Shapes");
         // creat custom drawing panel
        myPanel = new DrawPanel(); // instantiate a DrawPanel object
        myPanel.setBackground(Color.white);
         // set up resetButton
        // register an event handler for resetButton's ActionEvent
        resetButton = new JButton ("reset");
         resetButton.addActionListener(
          // anonymous inner class to handle resetButton events
             new ActionListener() {
                   // draw a black filled square shape after clicking resetButton
                 public void actionPerformed (ActionEvent event) {
                         // call DrawPanel method setShowStatus and pass an parameter
                      // to decide if show the shape
                     myPanel.setShowStatus(true);
                         isShow = myPanel.getShowStatus();
                         shape = DrawPanel.SQUARE;
                     // call DrawPanel method setShape to indicate shape to draw
                         myPanel.setShape(shape);
                     // call DrawPanel method setFill to indicate to draw a filled shape
                         myPanel.setFill(true);
                     // call DrawPanel method draw
                         myPanel.draw();
                         myPanel.setFill(true);
                         myPanel.setForeground(Color.black);
               }// end anonymous inner class
         );// end call to addActionListener
        // set up colorComboBox
        // register event handlers for colorComboBox's ItemEvent
        colorComboBox = new JComboBox(colorNames);
        colorComboBox.setMaximumRowCount(5);
        colorComboBox.addItemListener(
             // anonymous inner class to handle colorComboBox events
             new ItemListener() {
                 // select shape's color
                 public void itemStateChanged(ItemEvent event) {
                     if(event.getStateChange() == ItemEvent.SELECTED)
                         // call DrawPanel method setForeground
                         // and pass an element value of colors array
                         myPanel.setForeground(colors[colorComboBox.getSelectedIndex()]);
                    myPanel.draw();
            }// end anonymous inner class
        ); // end call to addItemListener
        // set up a pair of RadioButtons
        // register an event handler for RadioButtons' ItemEvent
         squareButton = new JRadioButton ("Square", true);
         circleButton = new JRadioButton ("Circle", false);
         radioGroup = new ButtonGroup();
         radioGroup.add(squareButton);
         radioGroup.add(circleButton);
        squareButton.addItemListener(
            // anonymous inner class to handle squareButton events
            new ItemListener() {
                   public void itemStateChanged (ItemEvent event) {
                       if (isShow==true) {
                             shape = DrawPanel.SQUARE;
                             myPanel.setShape(shape);
                             myPanel.draw();
               }// end anonymous inner class
         );// end call to addItemListener
         circleButton.addItemListener(
               // anonymous inner class to handle circleButton events
            new ItemListener() {
                   public void itemStateChanged (ItemEvent event) {
                         if (isShow==true) {
                             shape = DrawPanel.CIRCLE;
                             myPanel.setShape(shape);
                             myPanel.draw();
                         else
                             System.out.println("Please click Reset button first");
               }// end anonymous inner class
         );// end call to addItemListener
         // set up filledButton
        // register an event handler for filledButton's ItemEvent
        filledButton = new JCheckBox("Filled", true);
         filledButton.addItemListener(
          // anonymous inner class to handle filledButton events
        new ItemListener() {
              public void itemStateChanged (ItemEvent event) {
                if (isShow==true) {
                        if (event.getStateChange() == ItemEvent.SELECTED) {
                              isFill=true;
                              myPanel.setFill(isFill);
                              myPanel.draw();
                        else {
                            isFill=false;
                              myPanel.setFill(isFill);
                              myPanel.draw();
                else
                    System.out.println("Please click Reset button first");
          }// end anonymous inner class
         );// end call to addItemListener
        // set up sizeSlider
        // register an event handler for sizeSlider's ChangeEvent
        sizeSlider = new JSlider(SwingConstants.HORIZONTAL, 0, 300, 100);
        sizeSlider.setMajorTickSpacing(10);
        sizeSlider.setPaintTicks(true);
        sizeSlider.addChangeListener(
             // anonymous inner class to handle sizeSlider events
             new ChangeListener() {
                  public void stateChanged(ChangeEvent event) {
                      myPanel.setShapeSize(sizeSlider.getValue());
                         myPanel.draw();
             }// end anonymous inner class
         );// end call to addChangeListener
        // set up panel containing buttons
         buttonPanel = new JPanel();
        buttonPanel.setLayout(new GridLayout(4, 1, 0, 50));
         buttonPanel.add(resetButton);
         buttonPanel.add(filledButton);
        buttonPanel.add(colorComboBox);
        JPanel radioButtonPanel = new JPanel();
        radioButtonPanel.setLayout(new GridLayout(2, 1, 0, 20));
        radioButtonPanel.add(squareButton);
        radioButtonPanel.add(circleButton);
        buttonPanel.add(radioButtonPanel);
        // attach button panel & draw panel to content panel
        Container container = getContentPane();
        container.setLayout(new BorderLayout(10,10));
        container.add(myPanel, BorderLayout.CENTER);
         container.add(buttonPanel, BorderLayout.EAST);
        container.add(sizeSlider, BorderLayout.SOUTH);
        setSize(500, 400);
         setVisible(true);
     public static void main(String args[]) {
         shapes application = new shapes();
         application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}second one is drawpanel:
import java.awt.*;
import javax.swing.*;
public class DrawPanel extends JPanel {
     public final static int CIRCLE = 1, SQUARE = 2;
     private int shape;
     private boolean fill;
     private boolean showStatus;
    private int shapeSize = 100;
    private Color foreground;
     // draw a specified shape
    public void paintComponent (Graphics g){
          super.paintComponent(g);
          // find center
        int x=(getSize().width-shapeSize)/2;
          int y=(getSize().height-shapeSize)/2;
          if (shape == CIRCLE) {
             if (fill == true){
                 g.setColor(foreground);
                  g.fillOval(x, y, shapeSize, shapeSize);
            else{
                   g.setColor(foreground);
                g.drawOval(x, y, shapeSize, shapeSize);
          else if (shape == SQUARE){
             if (fill == true){
                 g.setColor(foreground);
                    g.fillRect(x, y, shapeSize, shapeSize);
            else{
                    g.setColor(foreground);
                g.drawRect(x, y, shapeSize, shapeSize);
    // set showStatus value
    public void setShowStatus (boolean s) {
          showStatus = s;
     // return showstatus value
    public boolean getShowStatus () {
          return showStatus;
     // set fill value
    public void setFill(boolean isFill) {
          fill = isFill;
     // set shape value
    public void setShape(int shapeToDraw) {
          shape = shapeToDraw;
    // set shapeSize value
    public void setShapeSize(int newShapeSize) {
          shapeSize = newShapeSize;
    // set foreground value
    public void setForeground(Color newColor) {
          foreground = newColor;
     // repaint DrawPanel
    public void draw (){
          if(showStatus == true)
          repaint();
}If any kind people who can help me.
many thanks to you!

Answer 1

4 widgets???
maybe this is what you mean.
add this inside your actionPerformed method for the reset action
squareButton.setSelected(true);
colorComboBox.setSelectedIndex(0);
if not be more clear in your post.