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...

[ Continued ]

I need to create a Java program that:

Takes as input a rooted tree T and a node c of T and converts T to another tree with the same set of node adjacency but now rooted at v.

any suggestions to start off?

In today’s digital age information is power and all critical information is currently stored on protected servers operated by companies themselves or by 3rd party operators. If a company cannot protect its data from access by unauthorized individuals, the result can be devastating for the company itself as well as all vendors and stakeholders involved with the company. Such critical data which are usually protected using leading information security services can be used by unauthorized individuals to commit crimes such as insider trading, tender fixing etc. Countries all over the world have laws to prevent such unauthorized data access and non-compliance with the guidelines is cognizable offence with the companies paying hefty fines to the government, if the data security measures are breached. However, a common question that arises is how to companies ensure that their data stays protected from access by unauthorized individuals. Some of the security solutions designed to ensure proper d...

[ Continued ]

The internet has untouched the way so as to businesses sell dramatically in the onwards decade. Most businesses at the moment rely on their website to generate leads, sales or significance in the upshot or service they plug. Because of the prominence in search engines whilst it comes to driving frequent to a website, SEO Services allow increased in popularity. SEO, or search engine optimization, is the process of humanizing your website's grade in the search engines in support of keywords linking to your position.

Online marketing on the undivided has risen in popularity, with the digit of specialists in various areas growing speedily. Such areas include SEM (Search Engine Marketing) and SEO.

Both SEM and SEO consultants are particularly comfortable to come up to by online and a digit of businesses service competitively priced services of specialists they might in no way truly unite in person. But with increasing facts of SEO companies setting up in offices in cities all greater than...

[ Continued ]