用Java FX做一个时钟

好的，以下是一个简单的JavaFX时钟示例代码：

import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Line;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.stage.Stage;
import javafx.util.Duration;
import java.time.LocalTime;

public class Clock extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {
        Group root = new Group();
        Scene scene = new Scene(root, 400, 400, Color.WHITE);

        // 创建时钟圆盘
        Circle circle = new Circle(200, 200, 150);
        circle.setFill(Color.WHITE);
        circle.setStroke(Color.BLACK);

        // 创建时钟刻度线
        for (int i = 0; i < 12; i++) {
            Line line = new Line(200, 50, 200, 75);
            line.setStroke(Color.BLACK);
            line.setRotate(i * 30);
            root.getChildren().add(line);
        }

        // 创建时钟指针
        Line hourHand = new Line(200, 200, 200, 100);
        hourHand.setStrokeWidth(5);
        hourHand.setStroke(Color.BLACK);
        Line minuteHand = new Line(200, 200, 200, 50);
        minuteHand.setStrokeWidth(3);
        minuteHand.setStroke(Color.BLACK);
        Line secondHand = new Line(200, 200, 200, 50);
        secondHand.setStrokeWidth(1);
        secondHand.setStroke(Color.RED);

        // 创建时钟数字
        for (int i = 1; i <= 12; i++) {
            Text text = new Text(String.valueOf(i));
            text.setFont(Font.font("Arial", 20));
            text.setX(190 + 130 * Math.sin(i * Math.PI / 6));
            text.setY(210 - 130 * Math.cos(i * Math.PI / 6));
            root.getChildren().add(text);
        }

        // 创建时钟数字
        Text text = new Text(175, 380, "");
        text.setFont(Font.font("Arial", 20));
        root.getChildren().add(text);

        // 创建时间轴
        Timeline timeline = new Timeline(
                new KeyFrame(Duration.seconds(1), event -> {
                    LocalTime now = LocalTime.now();
                    double hourAngle = (now.getHour() % 12 + now.getMinute() / 60.0) * 30;
                    double minuteAngle = now.getMinute() * 6;
                    double secondAngle = now.getSecond() * 6;
                    hourHand.setRotate(hourAngle);
                    minuteHand.setRotate(minuteAngle);
                    secondHand.setRotate(secondAngle);
                    text.setText(now.toString());
                })
        );
        timeline.setCycleCount(Animation.INDEFINITE);
        timeline.play();

        // 将时钟组件添加到根节点
        root.getChildren().addAll(circle, hourHand, minuteHand, secondHand);

        primaryStage.setTitle("Clock");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

该程序的界面如下所示：


通过 Timeline 类来更新时钟指针和时间数字，这里我们将时间轴的周期设置为1秒。