JavaFX 中的定时器操作

Question

有时，我在刽子手游戏进行到一半时，“时间已到”警报会在不完美的时间打断我。例如，剩余时间是 40 秒，它告诉我时间到了，但问题是这种情况有时会发生，而不是在每个游戏中都会发生。这可能是由于 JavaFX 计时器功能造成的，但我不是专业人士。也许有什么我需要知道的。我在尝试自己解决问题但无法解决后发布请求帮助，我不需要有人来告诉我这是一个代码转储。如果我一开始就自己弄清楚的话，我就不会发帖了！感谢您的帮助，并提前感谢您。

Controller class:

//libraries import

public class Controller {

    //other FXML elements
    @FXML
    private Text time;
    @FXML
    private Text time1;

    //variables used defined;
    
    public void initialize() {
        language1.setText("Please select a language 1.English 2.French ");
        english.setVisible(true);
        french.setVisible(true);

        //all others elements are invisible
        
    }

    public void onClick(ActionEvent event){    
        String letter = ((Button)event.getSource()).getText().toLowerCase();        
        ((Button) event.getSource()).setDisable(true);
        
        time1.setText("");
        String str1 = timer.remain();
        time.setText("The remining time is "+str1+" seconds");}
      
        if(myLetters.contains(letter)){
            int letterIndex = myLetters.indexOf(letter);
            while (letterIndex != -1) {
                correct++;
                myLetters.set(letterIndex, "*");
                answer.set(letterIndex*2, letter);
                letterIndex = myLetters.indexOf(letter);
                String res = String.join("", answer);
                text.setText(res);
            }
            
            if(correct==word.length()){
                winStatus.setText("You Win!");}
                buttons.setDisable(true);
                timer.stop();
            }
        }
        else{
            mistakes++;
            if(timer.isFinished()){
                timer.stop();
                timer.showAlertEnglish();
                buttons.setDisable(true);
            }
         
            if(mistakes ==1)       base1.setVisible(true);
            // show other parts of hangman 
            else if (mistakes ==8){
                man.setVisible(true);
                winStatus.setText("You Lose!");
                realWord.setText("The actual word was " + word);
                buttons.setDisable(true);
                timer.stop();
            }
        }
    }
    
    public void select(ActionEvent event) {
        //chnages the game due to the selected language
   
   
        time1.setText("Vous avez 1 minute. Allez !");
        timer.start();
    }
    
    
    public void newGame(){
        time.setText("");
        for(int i=0; i<35; i++){
            buttons.getChildren().get(i).setDisable(false);
        }
        newGameButton.setText("");
        initialize();
    }
    
}```

Timer class:
Import java.util.Timer;
import java.util.TimerTask;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;

public class timer {
    
    private static long startTime;
    private static long remaining;
    private static long remainingTimeSeconds;
    private static long remainingTimeMilliSeconds;
    private static boolean timeUp;
    private static Timer timer;
    
    public static void start() {
        startTime = System.currentTimeMillis();
        timeUp = false;
        timer = new Timer();
        timer.schedule(new TimerTask() {
         public void run() {
                      timeUp = true;
                  }
         }, 60 * 1000);
        }
    
    public static String remain() {
        remaining=(60 * 1000) - (System.currentTimeMillis() - startTime);
        remainingTimeSeconds = (remaining)/ 1000;
        remainingTimeMilliSeconds= (remaining)%1000;
        if (remainingTimeMilliSeconds<0) {remainingTimeMilliSeconds=0;}
        String ch=String.valueOf(remainingTimeSeconds)+"."+String.valueOf(remainingTimeMilliSeconds);
        return ch;
    }    
        

    public static boolean isFinished() {
         return timeUp;
    }
    
    public static void stop() {
        timeUp=true;
    }
    

    public static void showAlertEnglish() {
        Alert alert = new Alert(AlertType.WARNING);
        alert.setTitle("Time's Up!");
        alert.setHeaderText(null);
        alert.setContentText("You ran out of time. You lose!");
        alert.showAndWait();
    }
    
    public static void showAlertFrench() {
        Alert alert = new Alert(AlertType.WARNING);
        alert.setTitle("Temps écoulé !");
        alert.setHeaderText(null);
        alert.setContentText("Vous avez dépassé le temps imparti. Vous avez perdu !");
        alert.showAndWait();
    }
}
 

Answer 1

看看你是否可以合并这个使用

Timeline

的秒表，或者也许你可以从中得到一些想法。

示例代码：

主要

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.ButtonType;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class App extends Application {

    
    
    @Override
    public void start(Stage primaryStage) { 
        
        StopWatchGui stopWatchGui = new StopWatchGui(10);
        
        Button btnStop = new Button("Stop");
        Button btnStart = new Button("Start");
        Button btnPause = new Button("Pause");
        
        btnStart.setOnAction((t) -> {
            stopWatchGui.start();
        });
        
        btnPause.setOnAction((t) -> {
            stopWatchGui.pause();
        });
        
        btnStop.setOnAction((t) -> {
            stopWatchGui.stop();
        });
        
        stopWatchGui.remainingSecondsProperty().addListener((ov, oldValue, newValue) -> {
            if(newValue != null)
            {
                if(newValue.intValue() == 0)
                {
                    stopWatchGui.pause();
                    Alert alert = new Alert(Alert.AlertType.INFORMATION, "Out of Time", ButtonType.CLOSE);
                    alert.show();
                }
            }
        });
        VBox root = new VBox(stopWatchGui.getStopWatch(), new HBox(btnStart, btnPause, btnStop));
        Scene scene = new Scene(root);
        primaryStage.setScene(scene);
        primaryStage.show();     
    }

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

秒表Gui

import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.event.ActionEvent;
import javafx.scene.layout.VBox;
import javafx.scene.text.Text;
import javafx.util.Duration;

/**
 *
 * @author sedj601
 */
public class StopWatchGui
{
    private final Text display = new Text();    
    private final VBox vbox = new VBox();
    private final Timeline stopWatchTimeline;
    
    private final IntegerProperty seconds = new SimpleIntegerProperty();
    private final int initialSeconds;
    
    public StopWatchGui(int initialSeconds)
    {
        this.initialSeconds = initialSeconds;
        seconds.set(initialSeconds);
        
        display.setText(String.format("%02d:%02d:%02d", seconds.get() / 3600, (seconds.get() % 3600) / 60, seconds.get() % 60));
        
        stopWatchTimeline = new Timeline(new KeyFrame(Duration.seconds(1), (ActionEvent event) -> {           
            seconds.set(seconds.get() - 1);
            display.setText(String.format("%02d:%02d:%02d", seconds.get() / 3600, (seconds.get() % 3600) / 60, seconds.get() % 60));            
        }));
        stopWatchTimeline.setCycleCount(Timeline.INDEFINITE);
        
        vbox.getChildren().addAll(display);
    }

    public void pause()
    {
        stopWatchTimeline.pause();
    }
    
    public void stop()
    {
        seconds.set(initialSeconds);
        display.setText(String.format("%02d:%02d:%02d", seconds.get() / 3600, (seconds.get() % 3600) / 60, seconds.get() % 60));
    }
    
    public void start()
    {
        stopWatchTimeline.play();
    }
    
    public VBox getStopWatch()
    {
        return vbox;
    }
    
    public IntegerProperty remainingSecondsProperty()
    {
        return seconds;
    }

    public int getRemainingSeconds()
    {
        return seconds.get();
    }
}

输出

代码来自：https://stackoverflow.com/a/50627639/2423906