Jumpy Movement [need help] - Java-Gaming.org

Hello Everyone, Recently i have been having trouble with smooth movement. i have tried multiple ways but i continuesly get jumpy movement. i'm not sure if it has something to do with my game loop or is it something to do with how i move my player. Down below is my gameLoop how i move my player and my Input class. i would love some help thanks alot

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public void run() {
      long lastTime = System.nanoTime();
      double nsPerTick = 1000000000.0 / 60.0;

      int ticks = 0;
      int frames = 0;

      long lastTimer = System.currentTimeMillis();
      double delta = 0;

      init();

      while (running) {
         long now = System.nanoTime();
         delta += (now - lastTime) / nsPerTick;
         lastTime = now;
         while (delta >= 1) {
            ticks++;
            tick();
            delta--;
         }

         try {
            Thread.sleep(16);
         } catch (InterruptedException e) {
            e.printStackTrace();
         }

         frames++;
         render();

         if (System.currentTimeMillis() - lastTimer >= 1000) {
            lastTimer += 1000;

            System.out.println("FPS " + frames + " TICKS " + ticks);

            ticks = 0;
            frames = 0;
         }
      }
   }

Player Movement:

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public void tick(ArrayList<grassBlock> grass){
      x += velX;
      y += fallSpeed;
      
      if(Falling){
         fallSpeed += Gravity;
      }
      
      if(fallSpeed == 5){
         fallSpeed = 5;
      }
   }

Input class:

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public class Input implements KeyListener {

   public Game game;

   public Input(Game game) {
      this.game = game;
   }

   public void keyPressed(KeyEvent e) {
      int key = e.getKeyCode();
      if (key == KeyEvent.VK_A) {
         game.getPlayer().setVelX(-4);
      }else if (key == KeyEvent.VK_D) {
         game.getPlayer().setVelX(4);
      }
   }

   public void keyReleased(KeyEvent e) {
      int key = e.getKeyCode();
      if (key == KeyEvent.VK_A) {
         game.getPlayer().setVelX(0);
      }else if (key == KeyEvent.VK_D) {
         game.getPlayer().setVelX(0);
      }
   }

   public void keyTyped(KeyEvent e) {
   }

}

Thanks for help