Programming Activity 13-2
/* HanoiClient
* Anderson, Franceschi
*/
import javax. swing. JOptionPane;
import javax. swing. JFrame;
import java. awt. Graphics;
public class HanoiClient extends JFrame
{
private TowersOfHanoi tOfH;
boolean started = false;
public HanoiClient()
{
tOfH = new TowersOfHanoi(4);
setDefaultCloseOperation(JFrame. EXIT_ON_CLOSE);
setSize(500, 300);
setVisible(true);
}
public TowersOfHanoi getTOfH()
{
return tOfH;
}
public void setStarted(boolean b)
{
started = b;
}
public void recursiveTOfH(int numDisks, int fromTower, int toTower, int useTower)
{
// Student writes the body of this method
//
// Using recursion, transfer numDisks disks from the tower
// fromTower to the tower toTower using the tower
// useTower
// The disks are numbered as follows: if we started with n disks,
// the disk at the top is disk # 1
// and the disk at the bottom is disk # n
// We call the moveDisk method inside the body of this method
// The moveDisk method moves one disk and takes 3 arguments:
// an int, representing the disk number to be moved
// an int, representing the tower to move the disk from
// an int, representing the tower to move the disk to
// So if these three variables are:
// diskNumber, fromTower, and toTower
// then the call to moveDisks will be:
// moveDisk(diskNumber, fromTower, toTower);
if (numDisks > 0)
{
// Student code starts here:
// 1. Move (numDisks - 1) disks from fromTower
// to useTower using toTower
// 2. Move one disk from fromTower to toTower
// Print a message to the screen, then
// call moveDisk in order to animate.
// 3. Move (numDisks - 1) disks from useTower to toTower
// using fromTower
}
// Base case: 0 disks to move ==> do nothing
//
// Student code ends here.
}
public void moveDisk(int diskNumber, int fromTower, int toTower)
{
repaint();
try
{
Thread. sleep(1000); // wait for the animation to finish
}
catch (Exception e)
{
}
// update parameters
tOfH. updateTowers(diskNumber, fromTower, toTower);
}
public void paint(Graphics g)
{
if (started)
{
super. paint(g);
tOfH. draw(g);
}
}
public int getNumberOfDisks()
{
boolean goodInput = false;
int numberDisks = 4; // will be reassigned - default is 4
while (!goodInput)
{
try
{
String answer = JOptionPane. showInputDialog(null, "Enter number of disks between 1 and 9");
if (answer != null)
{
numberDisks = Integer. parseInt(answer);
goodInput = true;
}
else
{
System. exit(0);
}
}
catch (Exception e)
{
}
}
return numberDisks;
}
public static void main(String[] args)
{
HanoiClient app = new HanoiClient()
// ask user for number of disks
while (true)
{
int numDisks = app. getNumberOfDisks();
(app. getTOfH()).setDisks(numDisks);
app. setStarted(true);
// start
app. recursiveTOfH((app. getTOfH()).getDisks(), 0, 2, 1);
// finish last step in animation
app. repaint();
System. out. println("Done\n");
// done
try
{
Thread. sleep(5000); // wait for the animation to finish
}
catch (Exception e)
{
}
JOptionPane. showMessageDialog(null, "Done");
}
}
}