用java的JVM写动态曲线变化

您可以使用JavaFX中的LineChart图表来绘制动态曲线变化。下面是一个简单的例子，它使用一个线程来更新图表数据，并将其添加到图表中：

import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.stage.Stage;

import java.util.Random;

public class DynamicLineChart extends Application {

    private static final int MAX_DATA_POINTS = 50;
    private int xSeriesData = 0;
    private XYChart.Series<Number, Number> series1 = new XYChart.Series<>();
    private XYChart.Series<Number, Number> series2 = new XYChart.Series<>();
    private Random random = new Random();

    private void init(Stage primaryStage) {
        NumberAxis xAxis = new NumberAxis(0, MAX_DATA_POINTS, MAX_DATA_POINTS / 10);
        NumberAxis yAxis = new NumberAxis(-10, 10, 1);

        LineChart<Number, Number> lineChart = new LineChart<>(xAxis, yAxis);
        lineChart.setAnimated(false);
        lineChart.setTitle("Dynamic Line Chart");

        series1.setName("Random Data 1");
        series2.setName("Random Data 2");

        lineChart.getData().addAll(series1, series2);

        primaryStage.setScene(new Scene(lineChart));
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        init(primaryStage);
        primaryStage.show();

        AnimationTimer timer = new AnimationTimer() {
            @Override
            public void handle(long now) {
                addDataToSeries();
            }
        };
        timer.start();
    }

    private void addDataToSeries() {
        double randomY1 = random.nextDouble() * 20 - 10;
        double randomY2 = random.nextDouble() * 20 - 10;

        series1.getData().add(new XYChart.Data<>(xSeriesData, randomY1));
        series2.getData().add(new XYChart.Data<>(xSeriesData, randomY2));

        if (series1.getData().size() > MAX_DATA_POINTS) {
            series1.getData().remove(0);
        }
        if (series2.getData().size() > MAX_DATA_POINTS) {
            series2.getData().remove(0);
        }

        xSeriesData++;
    }

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

在此示例中，我们使用LineChart来显示两个随机数序列的动态曲线变化。我们使用AnimationTimer线程来定期更新图表数据，并将其添加到图表中。我们还限制了每个系列中数据点的最大数量，以避免内存泄漏。