java实现爱心飘落

要实现爱心飘落效果，你可以使用 Java 的图形库，比如 AWT 或者 JavaFX。以下是一个使用 JavaFX 实现爱心飘落的示例代码：

import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
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.Path;
import javafx.scene.shape.QuadCurveTo;
import javafx.stage.Stage;
import javafx.util.Duration;

public class HeartAnimation extends Application {
    private static final double WIDTH = 800;
    private static final double HEIGHT = 600;

    @Override
    public void start(Stage primaryStage) {
        Group root = new Group();
        Scene scene = new Scene(root, WIDTH, HEIGHT, Color.BLACK);

        for (int i = 0; i < 50; i++) {
            Circle circle = new Circle(5, Color.RED);
            Path path = createHeartPath();
            double duration = Math.random() * 5 + 2; // 随机生成动画时长
            animateCircleOnPath(circle, path, duration);
            root.getChildren().addAll(circle, path);
        }

        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private Path createHeartPath() {
        double centerX = WIDTH / 2;
        double centerY = HEIGHT / 2 - 100;

        Path path = new Path();
        path.setStroke(Color.TRANSPARENT);
        path.setFill(Color.TRANSPARENT);

        path.getElements().add(new MoveTo(centerX, centerY));

        QuadCurveTo curve1 = new QuadCurveTo(0, 0, centerX, centerY + 200);
        QuadCurveTo curve2 = new QuadCurveTo(WIDTH, 0, centerX, centerY);
        path.getElements().addAll(curve1, curve2);

        return path;
    }

    private void animateCircleOnPath(Circle circle, Path path, double duration) {
        Timeline timeline = new Timeline();
        timeline.setAutoReverse(true);

        KeyValue keyValueX = new KeyValue(circle.centerXProperty(), path.getLayoutBounds().getWidth());
        KeyValue keyValueY = new KeyValue(circle.centerYProperty(), path.getLayoutBounds().getHeight());

        KeyFrame keyFrame = new KeyFrame(Duration.seconds(duration), keyValueX, keyValueY);
        timeline.getKeyFrames().add(keyFrame);

        timeline.setCycleCount(Timeline.INDEFINITE);
        timeline.play();
    }

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

以上代码使用 JavaFX 创建了一个窗口，然后在窗口中创建了一组爱心形状的圆，并使用动画让这些圆沿着一个心形路径飘落。你可以运行这段代码来查看效果。请注意，你可能需要在项目中添加 JavaFX 的相关依赖。

希望对你有帮助！如果你有任何问题，请随时问我。