I would like some suggestions on how to stop the threads once the conditions are met.
Here are my codes:
public class Animal implements Runnable {
private static boolean winner = false;
private String name;
private int position;
private int speed;
private long restMax;
public Animal(String name, int position, int speed, long restMax) {
this.name = name;
this.position = position;
this.speed = speed;
this.restMax = restMax;
}
@Override
public void run() {
while (position < 100){
position += speed;
try {
Thread.sleep((long) (0 + (Math.random() * restMax)));
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(name + " is at position " + position );
}
if (position >= 100){
winner = true;
System.out.println(name + " is the winner of the race!");
Thread.interrupted();
}
}
}
here is the output for 2 Animal objects I created s in the main method:
The threads kept on going even when the winner was declared (Homegrown Rabbit is the winner in this case). My question is how do I stop the other threads when the conditions are met? I tried the interrupted() method but I couldn't see any differences.
Homegrown Rabbit is at position 5
Homegrown Rabbit is at position 10
Wild Turtle is at position 3
Wild Turtle is at position 6
Homegrown Rabbit is at position 15
Homegrown Rabbit is at position 20
Wild Turtle is at position 9
Wild Turtle is at position 12
Wild Turtle is at position 15
Homegrown Rabbit is at position 25
Wild Turtle is at position 18
Homegrown Rabbit is at position 30
Wild Turtle is at position 21
Homegrown Rabbit is at position 35
Wild Turtle is at position 24
Homegrown Rabbit is at position 40
Wild Turtle is at position 27
Wild Turtle is at position 30
Homegrown Rabbit is at position 45
Homegrown Rabbit is at position 50
Wild Turtle is at position 33
Homegrown Rabbit is at position 55
Wild Turtle is at position 36
Wild Turtle is at position 39
Homegrown Rabbit is at position 60
Wild Turtle is at position 42
Wild Turtle is at position 45
Homegrown Rabbit is at position 65
Wild Turtle is at position 48
Wild Turtle is at position 51
Homegrown Rabbit is at position 70
Homegrown Rabbit is at position 75
Wild Turtle is at position 54
Wild Turtle is at position 57
Wild Turtle is at position 60
Homegrown Rabbit is at position 80
Homegrown Rabbit is at position 85
Wild Turtle is at position 63
Wild Turtle is at position 66
Homegrown Rabbit is at position 90
Wild Turtle is at position 69
Wild Turtle is at position 72
Wild Turtle is at position 75
Homegrown Rabbit is at position 95
Wild Turtle is at position 78
Homegrown Rabbit is at position 100
Homegrown Rabbit is the winner of the race!
Wild Turtle is at position 81
Wild Turtle is at position 84
Wild Turtle is at position 87
Wild Turtle is at position 90
Wild Turtle is at position 93
Wild Turtle is at position 96
Wild Turtle is at position 99
Wild Turtle is at position 102
Wild Turtle is the winner of the race!
You don't need any Thread primitives to stop the thread. You just need to exit the while loop.
Here is a modified run
public void run()
{
while (winner == false)
{
position += speed;
System.out.println(name + " is at position " + position );
if(position >= 100)
{
winner = true;
System.out.println(name + " is the winner of the race!");
break;
}
try
{
Thread.sleep((long) (0 + (Math.random() * restMax)));
}
catch (InterruptedException e)
{
e.printStackTrace();
}
}
}
If winner is found, simply exit the loop.
@Override
public void run() {
while (position < 100){
position += speed;
try {
Thread.sleep((long) (0 + (Math.random() * restMax)));
} catch (InterruptedException e) {
e.printStackTrace();
}
/* Since winner is static, once one thread sets this to true,
other threads will stop their execution as well. */
if (winner)
break;
System.out.println(name + " is at position " + position );
}
I executed this one and got this:
rabbit is at position 2
horse is at position 5
rabbit is at position 4
horse is at position 10
horse is at position 15
horse is at position 20
horse is at position 25
horse is at position 30
rabbit is at position 6
horse is at position 35
rabbit is at position 8
horse is at position 40
horse is at position 45
horse is at position 50
horse is at position 55
horse is at position 60
horse is at position 65
horse is at position 70
horse is at position 75
horse is at position 80
horse is at position 85
horse is at position 90
horse is at position 95
horse is at position 100
horse is the winner of the race!
Check the condition in every loop,when met,break out that loop,and the thread will be stopped.
interrupt()
a thread is just to set the interrupt flag,nothing else changed,you can check that value by isInterrupted()
generally speaking,a thread is unable to stop unless itself wish to.
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