
Concept explainers
Explanation of Solution
Calling “paintComponent ()” method:
- The “paintComponent ()” is a method used in the Java
programming language. - This method is called whenever the user wants to redraw the diagram.
- When a window becomes resized or visible, the system automatically calls the “paintComponent ()” method for all area of the screen which have to be redrawn.
Example:
Consider an example for the “paintComponent ()” method as follows:
//include the required header files
import javax.swing.JComponent;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;
//definition of "Ellipse" class
public class Ellipse extends JComponent
{
//definition of "paintComponent" method
public void paintComponent(Graphics g)
{
//create an object for "Graphics2D"
Graphics2D g2 = (Graphics2D) g;
/*declare the required variables and call the required methods*/
double wid = getWidth();
double ht = getHeight();
//create an object for "Ellipse2D"
Ellipse2D o = new Ellipse2D...
Explanation of Solution
Occurrence of “paintComponent()” method:
- A graphic object is the argument to the “paintComponent()”method.
The “repaint ()” method is used to refresh the screen...

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Chapter 2 Solutions
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