Question

我正在尝试创建4个并发运行的秒表。它们都是在程序开始时开始的。

我希望用户能够使用Q，W，E，R键来加速秒表（在键盘模式后从左到右）。我已经建立了几乎所有东西，但它不会让我按任何其他键但R键加速第4个时钟。

我想实现线程来允许这个。我该怎么做呢？

下面是代码：

public class Stopwatches extends Application {
    @Override
    public void start(Stage primaryStage) {    
        Time time1 = new Time();
        Time time2 = new Time();
        Time time3 = new Time();
        Time time4 = new Time();
        Text text1 = new Text("00:00:00");
        Text text2 = new Text("00:00:00");
        Text text3 = new Text("00:00:00");
        Text text4 = new Text("00:00:00");
        text1.setFont(Font.font("Times", 35));
        text2.setFont(Font.font("Times", 35));
        text3.setFont(Font.font("Times", 35));
        text4.setFont(Font.font("Times", 35));
        Timeline textClock1 = createTextStopwatch(time1, text1);
        textClock1.play();
        Timeline textClock2 = createTextStopwatch(time2, text2);
        textClock2.play();
        Timeline textClock3 = createTextStopwatch(time3, text3);
        textClock3.play();
        Timeline textClock4 = createTextStopwatch(time4, text4);
        textClock4.play();

        BorderPane pane = new BorderPane();
        TilePane tilePane = new TilePane();
        tilePane.setPadding(new Insets(15,5,5,5));
        tilePane.setAlignment(Pos.CENTER);
        tilePane.setHgap(40.0);
        tilePane.getChildren().addAll(text1, text2, text3, text4);
        pane.setCenter(tilePane);
        Scene scene = new Scene(pane, 1500, 400);

        scene.setOnKeyPressed(e -> {
            if (e.getCode() == Q ){
                textClock1.setRate(20.0);
            }
        });

        scene.setOnKeyReleased(e -> {
            if (e.getCode() == Q ){
                textClock1.setRate(1.0);
            }
        });

        scene.setOnKeyPressed(e -> {
            if (e.getCode() == W ){
                textClock2.setRate(20.0);
            }
        });

        scene.setOnKeyReleased(e -> {
            if (e.getCode() == W ){
                textClock2.setRate(1.0);
            }
        });

        scene.setOnKeyPressed(e -> {
            if (e.getCode() == E ){
                textClock3.setRate(20.0);
            }
        });

        scene.setOnKeyReleased(e -> {
            if (e.getCode() == E ){
                textClock3.setRate(1.0);
            }
        });

        scene.setOnKeyPressed(e -> {
            if (e.getCode() == R ){
                textClock4.setRate(20.0);
            }
        });

        scene.setOnKeyReleased(e -> {
            if (e.getCode() == R ){
                textClock4.setRate(1.0);
            }
        });

        primaryStage.setTitle("Stop Watch");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public Timeline createTextStopwatch(Time time, Text text) {
        Timeline animation = new Timeline(
        new KeyFrame(Duration.millis(1000), e -> {
            time.increase();
            text.setText(time.toString());
        }));
        animation.setCycleCount(Timeline.INDEFINITE);
        return animation;
    }

    public static void main(String[] args) {
        launch(args);
    }
}

我已经第二次尝试实现多线程，但它不会工作。

public class Stopwatches extends Application {

    @Override
    public void start(Stage primaryStage) {    
        Time time1 = new Time();
        Time time2 = new Time();
        Time time3 = new Time();
        Time time4 = new Time();
        Text text1 = new Text("00:00:00");
        Text text2 = new Text("00:00:00");
        Text text3 = new Text("00:00:00");
        Text text4 = new Text("00:00:00");
        text1.setFont(Font.font("Times", 35));
        text2.setFont(Font.font("Times", 35));
        text3.setFont(Font.font("Times", 35));
        text4.setFont(Font.font("Times", 35));
        Timeline textClock1 = createTextStopwatch(time1, text1);
        textClock1.play();
        Timeline textClock2 = createTextStopwatch(time2, text2);
        textClock2.play();
        Timeline textClock3 = createTextStopwatch(time3, text3);
        textClock3.play();
        Timeline textClock4 = createTextStopwatch(time4, text4);
        textClock4.play();

        BorderPane pane = new BorderPane();
        TilePane tilePane = new TilePane();
        tilePane.setPadding(new Insets(15,5,5,5));
        tilePane.setAlignment(Pos.CENTER);
        tilePane.setHgap(40.0);
        tilePane.getChildren().addAll(text1, text2, text3, text4);
        pane.setCenter(tilePane);
        Scene scene = new Scene(pane, 1500, 400);

        Runnable task1 = new IncreaseTime(textClock1);
        Runnable task2 = new DecreaseTime(textClock1);
        Runnable task3 = new IncreaseTime(textClock2);
        Runnable task4 = new DecreaseTime(textClock2);
        Runnable task5 = new IncreaseTime(textClock3);
        Runnable task6 = new DecreaseTime(textClock3);
        Runnable task7 = new IncreaseTime(textClock4);
        Runnable task8 = new DecreaseTime(textClock4);

        Thread thread1 = new Thread(task1);
        Thread thread2 = new Thread(task2);
        Thread thread3 = new Thread(task3);
        Thread thread4 = new Thread(task4);
        Thread thread5 = new Thread(task5);
        Thread thread6 = new Thread(task6);
        Thread thread7 = new Thread(task7);
        Thread thread8 = new Thread(task8);


        scene.setOnKeyPressed(e -> {
            if (e.getCode() == Q ){
                thread1.start();
            }
        });

        scene.setOnKeyReleased(e -> {
            if (e.getCode() == Q ){
                thread2.start();
            }
        });

        scene.setOnKeyPressed(e -> {
            if (e.getCode() == W ){
                thread3.start();
            }
        });

        scene.setOnKeyReleased(e -> {
            if (e.getCode() == W ){
                thread4.start();
            }
        });

        scene.setOnKeyPressed(e -> {
            if (e.getCode() == E ){
                thread5.start();
            }
        });

        scene.setOnKeyReleased(e -> {
            if (e.getCode() == E ){
                thread6.start();
            }
        });

        scene.setOnKeyPressed(e -> {
            if (e.getCode() == R ){
                thread7.start();
            }
        });

        scene.setOnKeyReleased(e -> {
            if (e.getCode() == R ){
                thread8.start();
            }
        });

        primaryStage.setTitle("Stop Watch");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public Timeline createTextStopwatch(Time time, Text text) {
        Timeline animation = new Timeline(
        new KeyFrame(Duration.millis(1000), e -> {
            time.increase();
            text.setText(time.toString());
        }));
        animation.setCycleCount(Timeline.INDEFINITE);
        return animation;
    }

    public static void main(String[] args) {
        launch(args);
    }
}

class IncreaseTime implements Runnable {
    Timeline textClock;

    public IncreaseTime(Timeline textClock) {
        this.textClock = textClock;
        }


    @Override
    public void run() {
        textClock.setRate(20.0);
    }

}

class DecreaseTime implements Runnable {
    Timeline textClock;

    public DecreaseTime(Timeline textClock) {
        this.textClock = textClock;
        }


    @Override
    public void run() {
        textClock.setRate(1.0);
    }

}

我忘了show我的二级类创建了Time对象，这里是：

public class Time {
    int value = 0;

    int getSecond() {
      return value % 60;
    }

    int getMinute() {
      return (value / 60) % 60;
    }

    int getHour() {
      return value / 3600;
    }  

    void reset() {
      value = 0;
    }

    void increase() {
      value++;
    }

    @Override
    public String toString() {
      return getTwoDigitString(getHour()) + ":" + getTwoDigitString(getMinute())
        + ":" + getTwoDigitString(getSecond());
    }

    static String getTwoDigitString(int v) {
      if (v < 10)
        return "0" + v;
      else
        return "" + v;
    }
  }

Answer 1

应用程序按下所有按钮Q，W，E，R。

问题是textClock4上的所有setOnKeyReleased方法都是setRate。所以我相信你认为只是按下你的R按钮。

听起来像你想要的地方

Q to operate on textClock1
W to operate on textClock2
E to operate on textClock3
R to operate on textClock4

调试提示是在按下按钮时从场景向控制台添加打印语句。您开始分解并缩小代码中问题所在的位置。

Answer 2

你的eventListeners覆盖了他们自己。使用一个setOnKeyPressed和setOnKeyReleased，它使用if-then-else实现逻辑。

线索秒表

2 个答案: