i have doubt in string ,in the programm string is a data type or not

public class Name
{

public static void main(String args[])
{
String s="welcome";
System.out.println(s);
}
}

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while using wait and notify or notifyAll method in Java following things must be remember :

1) use notifyAll instead of notify if you expect more than one thread is waiting for lock.
2)wait() and notify() method must be called from synchronized context, see the link for more detailed explanation http://javarevisited.blogspot.com/2011/05/wait-notify-and-notifyall-in-java.html.
3) Always call wait() method in loop because if multiple threads are waiting for lock and one of them got lock and reset the condition and other thread needs to check the condition after they got wake up to see whether they need to wait again or can start processing.
4) use same object for calling wait() and notify() method, every object has its own lock so calling wait() on objectA and notify() on object B will not make any sense.

Program below is working i just don't know what to do for the algorithm on keyevents for right,left,up and down
The code like y+=10; is just my assumption for the snake movement.....
I believe below the path.reset() code has to be change since stack is being use...
Can anyone help me program to run correctly?

/***
* PROVIDE THE MISSING CODE in the keyPressed() method
* in order to move the 'snake' around the interface
* by pressing:
*
* --> cursor keys
* --> CTRL-Z to 'undo' last move
* --> CTRL-Y to 'redo' past/last move
*/

package midterms;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;
import java.util.*;
import javax.swing.border.*;



public class Snakes extends JPanel implements KeyListener {
final static long serialVersionUID = 1;
final private int WIDTH = 600;
final private int HEIGHT = 400;

LinkedList<Point> snake = new LinkedList<Point>();
Stack<Point> undo = new...

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