shapes

hi pliz help me put a shape in this code such that when the answer is equal and right it shuld change the color of the background and puts a shape. pliz help its urgent

import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.text.DecimalFormat; import java.text.NumberFormat; import java.util.Random; import javax.swing.JButton; import javax.swing.JFormattedTextField; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.UIManager; import javax.swing.border.EmptyBorder; import java.awt.Color; import java.awt.Container;

//****************** public class MathsClass extends JFrame { private JPanel components; private JPanel buttonPanel; private JLabel number,square; private JFormattedTextField numberField; private JFormattedTextField squareField; private JButton okButton; private NumberFormat numberFormatter; private JPanel panel1; private JButton button; Random randomNumber=new Random(); int randomNO; int randomSquare;

//********************** //MathsClass constructor public MathsClass() {

    super("Mathematical Tutor");
    setLayout(new FlowLayout());//set frame layout
    setFormats();
    //its meant to set the background color of the frame
    Container winnie = getContentPane();
    winnie.setBackground(Color.blue);


    components=new JPanel(new GridLayout(2,3,0,3));
    components.setBorder(new EmptyBorder(20,20,20,20));
    components.setPreferredSize(new Dimension(350,100));

    buttonPanel=new JPanel();
    buttonPanel.setBorder(new EmptyBorder(20,0,0,10));//set size of the EmptyBorder
    number= new JLabel("Number:");
    square= new JLabel("Number Squared:");
    numberField=new JFormattedTextField();
    numberField.setEditable(false);//only gets input from the computer
    numberField.setValue((generateRandom()));
    squareField=new JFormattedTextField(numberFormatter);//put only integers in the textfield


    okButton=new JButton("Ok");

    okButton.addActionListener
        (
  //*******************************************************************         
        new ActionListener()
        {
               public void actionPerformed(ActionEvent evt)
            {
               int num=((Number)numberField.getValue()).intValue();
                           int input=((Number)squareField.getValue()).intValue();
                           //calculation of squares of the random numbers
                           randomSquare=(num*num);


                         if(input==(randomSquare))
                           {
                            //display the color of the OptionPane background
                               UIManager.put("OptionPane.background", Color.cyan);
                               JOptionPane.showMessageDialog(MathsClass.this,"Huraah, the answer is right",
                "The Square of the number.",JOptionPane.INFORMATION_MESSAGE );


                           }

                          else
                           {
                              //remove the background color
                               UIManager.put("OptionPane.background", "null");
                               //used to display the message
                               JOptionPane.showMessageDialog(MathsClass.this,"Sorry the answer is Wrong . "
                                       + "The right answer is:" + randomSquare,
                "The Square of the number.",JOptionPane.INFORMATION_MESSAGE );
                           }
                           numberField.setValue((generateRandom()));
                           // to clear automatically
                           squareField.setValue(null);

            }
        }
        );

    components.add(number);//add number to JFrame
    components.add(numberField);//add numberfield to JFrame
    components.add(square);//add square to JFrame
    components.add(squareField);//add squarefield to JFrame

     buttonPanel.add(okButton);// add the ok button to JFrame


    components.setBackground(Color.magenta);//set background color of the components
    buttonPanel.setBackground(Color.blue);//set background color of the frame
    winnie.add(components);//add components to JFrame
    winnie.add(buttonPanel);//add buttonPanel to JFrame


}

//********************* //to generate random numbers private int generateRandom() { //numbers between 1 and 10 randomNO=1+ randomNumber.nextInt(9); return randomNO; }

//setFormats constructor private void setFormats() {

    numberFormatter=(DecimalFormat)NumberFormat.getNumberInstance();
    numberFormatter.setParseIntegerOnly(true);//convert string into int values in the calculation
}

//*********************** //main program public static void main(String[] args) {

                      MathsClass mathsClass = new MathsClass();//create MathsClass

              mathsClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

              mathsClass.setSize(400,350);//set frame size
                      mathsClass.setResizable(false);//inability to minimize
              mathsClass.setVisible(true);//display frame


                    }
        }