Override the equals method of the Point class

src/edu/caltech/cs2/lab08/Point.java

         Point p = (Point) o;
         return (this.x == p.x && this.y == p.y);
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (o instanceof Point) {
+            return isEqual((Point) o);
+        }
+        return false;
+    }
 }