Moving graphics with arrow keys simple problem

Hey everyone, firstly I'd just like to say that I'm new to the site :)
Secondly, I have a problem that I just can't solve myself.

So I'm making a program for air hockey, and I'm moving blue Ellipse2D Shape object (circle) with my arrow keys (Up, left, down, right).

The problem is, is that when I press for example the up key I don't want the circle to leave the frame. Now see I tried putting if statements, while loops, and nothing goes well. No matter what if as long as I HOLD my keys, they could surpass the frame boundaries.

Code:

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import javax.swing.*;
import javax.swing.Timer;
import java.awt.*;
import java.util.*;
import java.util.*;
import java.awt.event.*;
import java.awt.geom.*;


public class AirHockey extends JPanel implements ActionListener, KeyListener{
       
        double x, y;
        double velX = 0, velY = 0;
       
        public AirHockey() {
                Timer t = new Timer(5, this);
                t.start();
                addKeyListener(this);
                setFocusable(true);
        }
       
        public void paintComponent(Graphics g) {
                super.paintComponent(g);
                Graphics2D g2 = (Graphics2D) g;
                Shape circle = new Ellipse2D.Double(x, y, 40, 40);
                g2.setColor(Color.BLUE);
                g2.fill(circle);
        }

        @Override
        public void actionPerformed(ActionEvent e) {
                repaint();
                x += velX;
                y += velY;
        }

        @Override
        public void keyPressed(KeyEvent e) {
                int code = e.getKeyCode();
                if (code == KeyEvent.VK_UP) {
                        velY = -2;
                        velX = 0;
                }
                if (code == KeyEvent.VK_DOWN) {
                        velY = 2;
                        velX = 0;
                }
                if (code == KeyEvent.VK_LEFT) {
                        if (x < 0) {
                                velY = 0;
                                velX = 0;
                        }else {
                        velY = 0;
                        velX = -2;
                        }
                }
                if (code == KeyEvent.VK_RIGHT) {
                        if (x > 760) {
                                velY = 0;
                                velX = 0;
                        }
                        velY = 0;
                        velX = 2;
                }
        }

        @Override
        public void keyReleased(KeyEvent e) {
                int code = e.getKeyCode();
                if (code == KeyEvent.VK_UP) {
                        velY = 0;
                        velX = 0;
                }
                if (code == KeyEvent.VK_DOWN) {
                        velY = 0;
                        velX = 0;
                }
                if (code == KeyEvent.VK_LEFT) {
                        velY = 0;
                        velX = 0;
                }
                if (code == KeyEvent.VK_RIGHT) {
                        velY = 0;
                        velX = 0;
                }
       
        }

        @Override
        public void keyTyped(KeyEvent e) {
               
        }
}

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I don't see any if statements regarding boundaries in the current code that you've posted. Why not show us your attempt at using these.

There are attempts in the code I posted right now, look at the keyPressed method there are some if statements I tried for a few of them.

The code looks reasonable for the left/right keys. You need to add some debug code to see what the actual value of x/y are when the KeyEvents are when the KeyEvents are generated and when the Timer fires.

I found a fix guys. I made it so that when the Ellipse2D object hit the edge of the screen, it kept the x or y coordinate stationary so it would never change. Yayy... :)