import javax.swing.JFrame; public class Player extends JFrame { private static final long serialVersionUID = -6213278730749915732L; public float speed = 0.0000003f; public double yPos = 100; public int ySize = 200; public Player() { this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setVisible(true); this.setResizable(false); } public int getPos(long dt, boolean up, boolean down) { // System.out.println(yPos); if(yPos > 850) { yPos = 850; } if (up) { yPos -= speed * dt; } else if (down && yPos < 850) { yPos += speed * dt; } return (int) yPos; } }