Can't make this circle disapear!

I am trying to make it so when you shoot a circle it disapears but I can't seem to get it to work!
Most of what relates to the circle disapearing is at the bottom.
Can you find my mistake?

Code :

package galaga;
 
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.ImageObserver;
import java.io.File;
 
import javax.swing.ImageIcon;
import javax.swing.JFrame;
 
public class mainmethod extends JFrame {
	int x = 200, y = 325;
	KL bob = new KL();
	int xShoot = (int) (x + 37.5);
	int yShoot = y;
	boolean READY = false;
	boolean enemy1hit = false;
 
	ImageIcon Spaceship = new ImageIcon("CRAPPYSPACESHIP.png");
	Image Ship = Spaceship.getImage();
	ImageObserver bo;
 
	public mainmethod() {
		super("Galaga");
		setVisible(true);
		setLocation(150, 150);
		setSize(400, 400);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		addKeyListener(bob);
		setBackground(Color.white);
	}
 
	public class KL implements KeyListener {
 
		public void keyPressed(KeyEvent e) {
 
			if (e.getKeyCode() == KeyEvent.VK_LEFT) {
 
				System.out.println("\nStarting with " + x);
				System.out.println("x is now " + x);
					System.out.println(" ");
					x = x - 5;
					xShoot=(int) (x+37.5);
 
					System.out.println("Bullet is at: x: " + xShoot + " y: " + yShoot);
				if (x <= 10) {
					x = 10;
					System.out
						.println("Collision detected with left side of window!");
 
				}
			}
			if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
 
				System.out.println("\nStarting with " + x);
				System.out.println("x is now " + x);
					x = x + 5;
					System.out.println(" ");
					xShoot=(int) (x+37.5);
 
					System.out.println("Bullet is at: x: " + xShoot + " y: " + yShoot );
				}
				if (x >= 300) {
					x = 300;
					System.out
						.println("Collision detected with right side of window!");
 
 
			}
 
			repaint();
 
			if (e.getKeyCode() == KeyEvent.VK_SPACE) {
				READY = true;
				System.out.println("FIRE! \n");
			}
		}
 
		public void keyReleased(KeyEvent e) {
			if (e.getKeyCode() == KeyEvent.VK_SPACE) {
				READY = false;
				System.out.println("Not READY TO FIRE! \n");
				if(READY=true) {
					yShoot = yShoot -5;
					repaint();
				}
			}
		}
 
		@Override
		public void keyTyped(KeyEvent e) {
 
		}
	}
 
	public void paint(Graphics g) {
 
		Image dbImage = createImage(getWidth(), getHeight());
		Graphics dbGraphics = dbImage.getGraphics();
		paintComponent(dbGraphics);
		g.drawImage(dbImage, 0, 0, this);
		repaint();
 
	}
 
	public void paintComponent(Graphics g) {
		g.setColor(Color.CYAN);
 
		Rectangle blarp = new Rectangle(x, y, 150, 150);
 
 
 
		g.fillRect((int) blarp.getX(), (int) blarp.getY(), 90, 50);
 
 
		if (yShoot<4) {
			yShoot=(int) blarp.getY();
			xShoot=(int) ((int) blarp.getX() + 37.5);
			repaint();
		}
		g.setColor(Color.RED);
		Rectangle Bullet = new Rectangle(xShoot, yShoot, 10, 20);
		g.fillRect((int) Bullet.getX(), (int) Bullet.getY(), 20, 30);
		repaint();
 
		Rectangle enemy1= new Rectangle(50, 50, 10, 10);
		g.fillOval(50, 50, 10, 10);
 
		if(yShoot<323) {
			yShoot = yShoot - 5;
			repaint();
		}	
		if(Bullet.getX()<=57 && Bullet.getX()>=42 && Bullet.getY()<=60 && Bullet.getY()>=40) {
			System.out.println("ENEMY1 Hit!");
			enemy1hit= true;
 
 
		}
	if(enemy1hit=true) {
				g.setColor(Color.white);
				g.fillOval(50,50,10,10);
		}
	}	
}

Thanks and please if you can help me!