Question

Create a sub class of the class Box and call it SBox. The SBox class has inherited the list of variables and methods from Box & has its own members too.

a. It has a variable color having a String data type.

b. This class also has a method called SetColor( ) which read the color from the user (Use JOptionPane), set the color to the value given by the user and display it.

Answer 1

import javax.swing.*;

public class Box

{
   private String name;

protected String getname()

{
   return this.name;

}
   protected void setname()

{
  this.name=JOptionPane.showInputDialog(null,"Please enter box name");

}
protected void displayName (JFrame jFrame)

{

JOptionPane.showMessageDialog(jFrame,"Box name is" + this.name);

}
public static void main(String[] args)
{
   SBox sBox= new SBox();

sBox.setName();

sBox.setcolor();

JFrame frame = new JFrame("SBox");

frame.setSize(200,200);

frame.setLocationRelativeTo(null);

frame.setVisible(false);

sBox.displayName(frame);

sBox.displayColor(frame);

  }
class SBox extends Box

{
private String color;

public void setColor()

{
   this.color = JOptionPane.showInputDialog(null,"Please enter box color:");

}
   public void displayColor(JFrame jFrame)

{
   JOptionPane.showMessageDialog(jFrame, "Color of box named" + this.getName() + "is" + this.color);

}
}