如何在Java 3D中设置自定义FPS

我想将程序限制为某些FPS，否则它将在一台计算机上运行得更快，而在另一台计算机上运行得更慢。

我想要像pygame中一样的东西-FPSClock = pygame.time.Clock（）FPSClock.tick（30）

Java 3D中是否有类似的东西？我是Java 3D的初学者，我尝试编写Pong游戏以提高自己的技能。但是，我被困住了，意识到在Java中没有适当的延迟的方法，因为您将不知道最后一帧的时间是什么。

我还发现KeyEvent在我的代码中不起作用。到目前为止，我的代码-

import com.sun.j3d.utils.universe.*;
import com.sun.j3d.utils.geometry.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.awt.event.*;
import java.awt.event.KeyListener.*;
import java.awt.event.WindowAdapter;
import java.awt.*;
import java.applet.Applet;
public class Pong implements KeyListener {
    static float ballx = 0.0f;
    static float bally = 0.0f;
    static float ballz = 0.0f;
    static Transform3D transform2 = new Transform3D();
    static TransformGroup transformGroup2 = new TransformGroup();
    public static void main(String[] args) {
        SimpleUniverse universe = new SimpleUniverse();
        BranchGroup group = new BranchGroup();
        Appearance appearance = new Appearance();
        Color3f color = new Color3f(0.1f, 1.8f, 0.1f);
        ColoringAttributes coloringAttributes = new ColoringAttributes(color, ColoringAttributes.NICEST);
        appearance.setColoringAttributes(coloringAttributes);
        Box box = new Box(0.05f, 0.2f, 0.03f, appearance);
        Transform3D transform = new Transform3D();
        TransformGroup transformGroup = new TransformGroup();
        transformGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
        Vector3f vector = new Vector3f(-0.9f, 0.0f, 0.0f);
        transform.setTranslation(vector);
        transformGroup.setTransform(transform);
        transformGroup.addChild(box);
        Box box1 = new Box(0.05f, 0.2f, 0.03f, appearance);
        Transform3D transform1 = new Transform3D();
        TransformGroup transformGroup1 = new TransformGroup();
        transformGroup1.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
        Vector3f vector1 = new Vector3f(0.9f, 0.0f, 0.0f);
        transform1.setTranslation(vector1);
        transformGroup1.setTransform(transform1);
        transformGroup1.addChild(box1);
        group.addChild(transformGroup);
        Sphere sphere = new Sphere(0.1f);
        group.addChild(transformGroup1);
        Vector3f vector2 = new Vector3f(0.0f,0.0f,0.0f);
        transform2.setTranslation(vector2);
        transformGroup2.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
        transformGroup2.setTransform(transform2);
        transformGroup2.addChild(sphere);
        Color3f lightColor = new Color3f(1.8f, 1.9f, 0.1f);
        BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
        Vector3f lightDirection = new Vector3f(4.0f, -7.0f, -12.0f);
        DirectionalLight light = new DirectionalLight(lightColor, lightDirection);
        light.setInfluencingBounds(bounds);
        transformGroup2.addChild(light);
        group.addChild(transformGroup2);
        Color3f ambientColor = new Color3f(1.0f, 1.0f, 1.0f);
        AmbientLight ambientLightNode = new AmbientLight(ambientColor);
        ambientLightNode.setInfluencingBounds(bounds);
        transformGroup2.addChild(ambientLightNode);
        universe.getViewingPlatform().setNominalViewingTransform();
        universe.addBranchGraph(group);
    }
    public void keyPressed(KeyEvent event) {
        if (event.getKeyChar() == 'a') {
            ballx = ballx   0.1f;
            transform2.setTranslation(new Vector3f(ballx, bally, ballz));
            transformGroup2.setTransform(transform2);
        }
    }
    public void keyReleased(KeyEvent event) {

    }
    public void keyTyped(KeyEvent event) {

    }
}