Multithreading \"Racers\" Now that you\'ve completed the unit on multithreading,

Question

Multithreading "Racers" Now that you've completed the unit on multithreading, you know the basics of how to create and run thread-based classes. This assignment allows you to practice multithreading programming. Your task in this assignment is to create a threaded class that "races" by counting and displaying the numbers from 1 to 10. Each of the instances of this thread class should have a unique ID (i.e. the first instance should be numbered "1", the next instance should be numbered "2", etc.). Now that you have your threaded class, write a main/driver class that instantiates/spawns 10 instances of your threaded class and runs each of them. When the first thread completes and returns, invoke System.exit() to terminate the program; in so doing, you will be able to determine which thread "won" and achieved it's conclusion first.

Explanation / Answer

Answer.)
Code for Racer Multi-threading :
class Racer extends Thread {
private Thread t;
private String racerName;

Racer( String name) {
//Initialising racer name
racerName = name;
}

//Calling the run method
public void run() {
boolean complete=false;
try {
for(int i = 1; i <=10; i++) {
System.out.println("Racer: " + racerName + "--" + i);
// Let the thread sleep for a while.
Thread.sleep(50);
}
complete=true;
}catch (InterruptedException e) {
System.out.println("Racer " + racerName + " interrupted.");
}
//Checking if loop completes once, printing and exiting
if(complete==true){
System.out.println("Racer " + racerName + " complete.");
System.exit(0);
}
}

//Starting the thread
public void start () {
if (t == null) {
t = new Thread (this, racerName);
t.start ();
}
}
}
public class TestThread {
public static void main(String args[]) {
//Creating thread objects
Racer T1 = new Racer("1");
Racer T2 = new Racer("2");
Racer T3 = new Racer("3");
Racer T4 = new Racer("4");
Racer T5 = new Racer("5");
Racer T6 = new Racer("6");
Racer T7 = new Racer("7");
Racer T8 = new Racer("8");
Racer T9 = new Racer("9");
Racer T10 = new Racer("10");
T1.start();
T2.start();
T3.start();
T4.start();
T5.start();
T6.start();
T7.start();
T8.start();
T9.start();
T10.start();
}
}
Output :
Racer: 1--1
Racer: 2--1
Racer: 4--1
Racer: 5--1
Racer: 3--1
Racer: 6--1
Racer: 7--1
Racer: 8--1
Racer: 9--1
Racer: 10--1
Racer: 1--2
Racer: 2--2
Racer: 4--2
Racer: 5--2
Racer: 3--2
Racer: 6--2
Racer: 7--2
Racer: 8--2
Racer: 9--2
Racer: 10--2
Racer: 1--3
Racer: 2--3
Racer: 4--3
Racer: 3--3
Racer: 5--3
Racer: 6--3
Racer: 7--3
Racer: 8--3
Racer: 9--3
Racer: 10--3
Racer: 1--4
Racer: 2--4
Racer: 4--4
Racer: 3--4
Racer: 5--4
Racer: 6--4
Racer: 7--4
Racer: 8--4
Racer: 9--4
Racer: 10--4
Racer: 1--5
Racer: 2--5
Racer: 4--5
Racer: 3--5
Racer: 5--5
Racer: 6--5
Racer: 7--5
Racer: 8--5
Racer: 9--5
Racer: 10--5
Racer: 1--6
Racer: 2--6
Racer: 4--6
Racer: 3--6
Racer: 5--6
Racer: 6--6
Racer: 7--6
Racer: 8--6
Racer: 9--6
Racer: 10--6
Racer: 1--7
Racer: 2--7
Racer: 4--7
Racer: 3--7
Racer: 5--7
Racer: 6--7
Racer: 7--7
Racer: 8--7
Racer: 9--7
Racer: 10--7
Racer: 1--8
Racer: 2--8
Racer: 4--8
Racer: 3--8
Racer: 5--8
Racer: 6--8
Racer: 7--8
Racer: 8--8
Racer: 9--8
Racer: 10--8
Racer: 1--9
Racer: 2--9
Racer: 4--9
Racer: 3--9
Racer: 5--9
Racer: 6--9
Racer: 7--9
Racer: 8--9
Racer: 9--9
Racer: 10--9
Racer: 1--10
Racer: 2--10
Racer: 4--10
Racer: 3--10
Racer: 5--10
Racer: 6--10
Racer: 7--10
Racer: 8--10
Racer: 9--10
Racer: 10--10
Racer 2 complete.
Racer 4 complete.
Racer 1 complete.
Racer 3 complete.

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