如何监视文本java fx中的打印持续时间? [英] How can I monitor the duration of printing in text java fx?

问题描述

反正我可以监视javafx中的持续时间吗?

Is there anyway that I can monitor the time duration in javafx?

让我们这样说吧

System.out.println("Printing Duration: " + duration++);

推荐答案

这是我通常为任务计时的方式.本示例跟踪ProgressBar完成所需的秒数.关键是在Task开始时启动Timeline，在Task完成时结束Timeline.

Here is how I normally time a task. This example tracks how many seconds it takes for a ProgressBar to complete. The key is starting the Timeline when the Task starts and ending the Timeline when the Task finishes.

import java.util.Random;
import java.util.concurrent.atomic.AtomicInteger;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.concurrent.Task;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ProgressBar;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.util.Duration;

public class Example extends Application
{

    @Override
    public void start(Stage stage)
    {
        AtomicInteger atomicInteger = new AtomicInteger();
        Label label = new Label("0 seconds");
        Timeline timeline = new Timeline(new KeyFrame(Duration.seconds(1), (event) -> {
            System.out.println(atomicInteger.incrementAndGet() + " seconds.");
            label.setText(atomicInteger.get() + " seconds");
        }));
        timeline.setCycleCount(Timeline.INDEFINITE);

        Task<Void> task = new Task<Void>()
        {
            @Override
            protected Void call() throws Exception
            {
                Random random = new Random();
                int randomNumber = random.nextInt(100) + 100;
                for (int i = 0; i < randomNumber; i++) {
                    updateProgress(i, randomNumber);
                    try {
                        Thread.sleep(100);
                    }
                    catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }

                return null;
            }
        };
        task.setOnSucceeded((event) -> {
            timeline.stop();
        });
        ProgressBar progressBar = new ProgressBar(0);
        progressBar.progressProperty().bind(task.progressProperty());

        Button button = new Button("Start");
        button.setOnAction((event) -> {
            button.setDisable(true);
            timeline.play();
            Thread thread = new Thread(task);
            thread.setDaemon(true);
            thread.start();
        });

        VBox root = new VBox(label, progressBar, button);
        Scene scene = new Scene(root, 500, 500);
        stage.setScene(scene);
        stage.show();
    }

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

}

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