How To Construct A Minimalistic Deadlock

Jan 7, 2015

i'm trying to construct a deadlock deliberately by coding this scenario:

1) Thread A enters a synchronized method of object foo

2) Thread A goes to sleep (thus still holding the key of foo)

3) Thread B enters a synchronized method of object bar

4) Thread B tries to enter a synchronized method of foo (, but cant)

5) Thread A wakes up and tries to enter a synchronized method of bar => deadlock

I'm trying to keep the code really minimalistic, i.e. just 2 threads and 2 objects.

I also dont want to use this syntax:

synchronized(a){
...
}

but would like to achieve this just by calling synchronized methods of 2 different objects (as stated above).

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Avoid Deadlock While Coding

Jul 25, 2014

is it possible to avoid deadlock while coding..

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This is my own coding for understanding deadlock in multithreading . But my doubt is whether this program mirrors the concept of deadlock perfectly or not. If not what should i do to make this code a perfect deadlock.

import java.io.*;

class A
{
B bc;
synchronized void funcA(B b)
{
bc=b;
System.out.println("INSIDE FIRST OBJECTS MONITOR");

[Code] ....

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How can we create deadlock condition on our servlet? Does calling doGet() from doPost() and vice versa really cause a deadlock? Or, does it cause a StackOverflowException?

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Apr 8, 2014

New to java/programming and i cant understand why the pen variable does not display the the correct value ... For example for input 1 ; 2 ; 3 ; 4 both variables will display 10 and i dont understand why pen does not have the value 6 .

import acm.program.*;
public class Chap4_ex12 extends ConsoleProgram {
public void run () {
int pen = 0;
int r = 1;
int sum = 0;
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r = readInt(" ? ");
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[code].....

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//construct and populate the Time menu
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mnuBar.add(mnuTime);
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mnuTime.add(mnuCurrentTime);

[Code] ....

E:Calculator.java:64: error: cannot find symbol
if (arg == "Time")
^
symbol: variable arg
location: class Calculator
1 error

Tool completed with exit code 1

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Mar 1, 2015

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Feb 11, 2014

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My problem is with stacking all these JPanels (each representing an email) and showing them on the UI as a list. I am not sure of any way to do this. Moreover, when a new email is received, it has to be displayed at the top of the list (not at the bottom).

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I am trying to write a program that read from a csv file called matches.csv ... A single football match can end with a win or a draw: in first case the winner team get 3 points and the loser none, in the second case of draw each of the two teams get 1 point.

In the file it contains the following data.

17/08/2013 Arsenal Aston Villa 1 3
24/08/2013 Aston Villa Liverpool 0 1

This means that a match has been played on the 17/08/2013 where Arsenal scored 1 goal while Aston Villa 3 goals: thus Arsenal got 0 points while Aston Villa 3 points.

How can I structure my output to make it make it read

Position Team Played Points
1 Aston Villa 2 3
2 Liverpool 1 3
3 Arsenal 1 0

My code so far:

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class Teams {
public static void main(String[] args) {
String fileName = "matches.csv";

[Code] ....

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package SystemandDesign.BinaryTree;
 
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import java.util.List;
import java.io.ObjectInputStream;

[Code] ....

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