Add javaDoc.

src/Wall.java

 import java.awt.*;
 
+/**
+ * this class keeps wall info
+ * @author narges salehi & sepehr tavakoli
+ * @version 1.1
+ * @since July 21 2020
+ */
 public class Wall {
-
+    //coordinate of wall
     private int x, y, width, height;
+    //Graphic2D to draw wall
     private Graphics2D g2d;
 
+    /**
+     * constructor of each wall
+     * @param x of wall
+     * @param y of wall
+     * @param width of wall
+     * @param height of wall
+     * @param g2d to draw wall
+     */
     public Wall(int x, int y, int width, int height, Graphics2D g2d) {
 
+        //set value given to constructor
         this.x = x;
         this.y = y;
         this.height = height;
@@ -16,18 +32,30 @@ public class Wall {
         g2d.fillRect(x, y, width, height);
     }
 
+    /**
+     * @return x of wall
+     */
     public int getX() {
         return x;
     }
 
+    /**
+     * @return y of wall
+     */
     public int getY() {
         return y;
     }
 
+    /**
+     * @return width of wall
+     */
     public int getWidth() {
         return width;
     }
 
+    /**
+     * @return Height of wall
+     */
     public int getHeight() {
         return height;
     }