Chapter 2.9, Problem 44SC

Explanation of Solution

Refer the example “section_9_2/ RectangleComponent.java” which describes about how to display the component. In that program, let modify the line numbers “18” and “24” which contains the graphics2D object “g2” to “g”, then the following code displays the compiler error.

Code:

//Import the required java packages

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Rectangle;

import javax.swing.JComponent;

//Define the method to draw the component

public class RectangleComponent extends JComponent

{

    //Define the method paintComponent()

    public void paintComponent(Graphics g)

     {

         // Recover Graphics2D

         Graphics2D g2 = (Graphics2D) g;

         // Construct a rectangle 

         Rectangle box = new Rectangle(5, 10, 20, 30);

   //Draw the rectangle

         g.draw(box);

         /* Move rectangle 15 units to the right and 25

 units down*/

         box.translate(15, 25);

         // Draw moved rectangle

         g.draw(box);

     }

 }

File name: “Square.java”

//Import the required package

import javax.swing.JFrame;

//Declare the class "Square"

public class Square

{

    //Define the main function

    public static void main(String[] args)

    {

        //Create the object for JFrame class

        JFrame frame = new JFrame();

        //Set the size of the frame

        frame...