hi all
I am doing this thread program and when i run it is not giving any output, can someone tell me why no output is shown.
public class RelayRaceDemo {
public static Thread runner[];
public static void main(String[]args){
RelayRacer rr = new RelayRacer();
ThreadGroup country[] = new ThreadGroup[5];
country[0] = new ThreadGroup("Tinidad and Tobago");
country[1] = new ThreadGroup("Jamiaca");
country[2] = new ThreadGroup("St Vincent");
country[3] = new ThreadGroup("Barbados");
country[4] = new ThreadGroup("Bahamas");
runner = new Thread[7];
Runnable relayRacer = null;
runner[0]= new Thread(country[0],relayRacer,"Trinidad racer 1");
runner[1]= new Thread(country[0],relayRacer,"Trinidad racer 2");
runner[2]= new Thread(country[1],relayRacer,"Tobago racer 1");
runner[3]= new Thread(country[1],relayRacer,"Tobago racer 2");
runner[4]= new Thread(country[2],relayRacer,"Bahamas racer 1");
runner[5]= new Thread(country[2],relayRacer,"Barbados racer 1");
runner[6]= new Thread(country[3],relayRacer,"St Vincent racer 1");
runner[0].start();;
runner[2].start();
runner[4].start();
runner[6].start();
}
public class RelayRacer implements Runnable{
public void relayRace(){
boolean winnerYet = false;
for(int distance=1; distance <=40; distance++){
System.out.println("Current runner"+ Thread.currentThread().getName() + " Has run "+
distance + "metres");
if(Thread.currentThread().getName().equals("Trinidad and Toabgo racer 1") && distance == 20)
{
threadJoin(distance, 0);
}
else if(Thread.currentThread().getName().equals("Jamiaca racer 1") && distance ==20){
threadJoin(distance, 2);
}
else if(Thread.currentThread().getName().equals("St Vincent racer 1")&& distance == 20){
threadJoin(distance, 2);
}
else if(Thread.currentThread().getName().equals("Barbados racer 1 ") && distance ==20){
threadJoin(distance, 3);
}
else if(Thread.currentThread().getName().equals("Bahamas racer 1") && distance == 20){
threadJoin(distance, 4);
}
if(isGroupRaceWinner (distance)){
System.out.println("Winning Country is"+Thread.currentThread().getThreadGroup());
}
}
}
public void threadJoin(int distance, int nextRunner){
//RelayRacerDemo
}
public boolean isGroupRaceWinner(int distance){
boolean winnerYet = false;
if(distance == 40 && winnerYet == false){
winnerYet = true;
return true;
}
else{
return false;
}
}
@Override
public void run(){
this.relayRace();
}
}
