learning about colision detection

DemoProjects/src/sprites/shootingMissles/Missile.java

@@ -3,6 +3,7 @@ package sprites.shootingMissles;
 public class Missile extends Sprite {
 
     private final int MISSILE_SPEED = 2;
+    private final int FRAME_WIDTH = 400;
 
     public Missile(int x, int y) {
         super(x, y);
@@ -11,15 +12,14 @@ public class Missile extends Sprite {
     }
 
     private void initMissile() {
-        loadImage("/home/bitecoding/Pictures/laser.png",35,35);
-        getImageDimensions();
+        loadImage("DemoProjects/res/laser.png",100,10);
     }
 
     public void move() {
 
-        y -= MISSILE_SPEED;
+        x += MISSILE_SPEED;
 
-        if (y < 0) {
+        if (x > FRAME_WIDTH) {
             visible = false;
         }
     }

DemoProjects/src/sprites/shootingMissles/SpaceShip.java

@@ -20,8 +20,7 @@ public class SpaceShip extends Sprite {
 
         missiles = new ArrayList<>();
 
-        loadImage("/home/bitecoding/Pictures/spaceship.png",50,50);
-        getImageDimensions();
+        loadImage("DemoProjects/res/spaceship.png",50,50);
     }
 
     public void move() {
@@ -59,7 +58,7 @@ public class SpaceShip extends Sprite {
     }
 
     public void fire() {
-        missiles.add(new Missile(x + width, y + height / 2));
+        missiles.add(new Missile(x - width/2, y + height/2 - 5));
     }
 
     public void keyReleased(KeyEvent e) {

DemoProjects/src/sprites/shootingMissles/Sprite.java

@@ -1,6 +1,10 @@
 package sprites.shootingMissles;
 
 import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+import javax.imageio.ImageIO;
 import javax.swing.ImageIcon;
 
 public class Sprite {
@@ -10,24 +14,21 @@ public class Sprite {
     protected int width;
     protected int height;
     protected boolean visible;
+    protected String path;
     protected Image image;
 
     public Sprite(int x, int y) {
-
         this.x = x;
         this.y = y;
         visible = true;
     }
 
     protected void loadImage(String imageName, int width, int height) {
-
+        path = imageName;
         ImageIcon ii = new ImageIcon(imageName);
         image = ii.getImage().getScaledInstance(width, height, Image.SCALE_DEFAULT);
-    }
-
-    protected void getImageDimensions() {
-        width = image.getWidth(null);
-        height = image.getHeight(null);
+        this.width = width;
+        this.height = height;
     }
 
     public Image getImage() {