2

条件が満たされたときにスレッドを停止する方法についていくつか提案をお願いします。

ここに私のコードがあります：

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();
        }
    }

}

main メソッドで s を作成した 2 つの Animal オブジェクトの出力を次に示します。

勝者が宣言されたときでさえ、スレッドは続きました (この場合、Homegrown Rabbit が勝者です)。私の質問は、条件が満たされたときに他のスレッドを停止するにはどうすればよいですか? interrupted() メソッドを試しましたが、違いは見られませんでした。

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!
4

3 に答える 3

3

スレッドを停止するために Thread プリミティブは必要ありません。while ループを終了するだけです。

ここに変更された実行があります

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();
        }
    }

}
于 2013-04-06T05:00:21.997 に答える
2

勝者が見つかった場合は、単にループを終了します。

   @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 );

    }

私はこれを実行し、これを得ました：

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!
于 2013-04-06T05:15:48.920 に答える
0

すべてのループで条件を確認し、満たされた場合、そのループを抜け出して、スレッドを停止します。

interrupt()スレッドは割り込みフラグを設定するだけで、他に何も変更されていません。その値を次の方法で確認できますisInterrupted()

一般的に言えば、スレッド自体が望まない限り、スレッドを停止することはできません。

于 2013-04-06T05:01:45.250 に答える