Question

For this assignment you are to create a button-controlled flying saucer program. You may run an example of the program here:

The driver and DisplayWindow which you may not alter are provided here:
/JavaCS1/src/explodingsaucer/SaucerDriver.java
/JavaCS1/src/explodingsaucer/DisplayWindow.java

Note that it makes use of the DisplayWindow class that figures prominently in Chapter 12 of the textbook. For this assignment you need only submit a single file, SaucerPanel.java (must be so named), which extends JPanel in the standard way, and which carries out the main actions of the assignment. Also, the city view provided above is pathetic. Feel free to make improvements to the city scene we've provided!

Submit the body of your code in the box below. Note that we provide the necessary import statements; do NOT include such statements in your pasted version.

/**   The driver class that instantiates the DisplayWindow
 *    and SaucerPanel, adds the panel to the window, then
 *    makes the call to showFrame to display the panel.
*/
public class SaucerDriver{

  public static void main(String[] args){
    DisplayWindow d = new DisplayWindow();
    SaucerPanel p = new SaucerPanel();
    d.addPanel(p);
    d.showFrame();
  }
}

import java.awt.*;
import javax.swing.*;
/**
 *  A class that puts a graphics window on your display
*/
public  class DisplayWindow extends JFrame{
 /**
   * Content pane that will hold the added Jpanel
   */
  private Container c;
  /**
   * DisplayWindow constructor - no parameters
   */
  public DisplayWindow(){
    super("Display");
    c = this.getContentPane();
  }
   /**
 * Adds panel to content pane
 * @parameter the panel to be added
 */
  public void addPanel(JPanel p){
    c.add(p);
  }
  /**
 * consolidates the frame, makes it visible,
 * causes program termination when window is closed manually
 */
  public void showFrame(){
    this.pack();
    this.setVisible(true);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }
}