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diff --git a/challenge-109/cheok-yin-fung/java/Box.java b/challenge-109/cheok-yin-fung/java/Box.java
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+// The Weekly Challenge - 109
+// Task 2 Four Squares(Rectangles) Puzzle
+// Supporting codes
+
+class Box
+{
+    private Point tl, br;
+
+    Box(int x1, int y1, int x2, int y2) {
+        tl = new Point(x1, y1);
+        br = new Point(x2, y2);
+    }
+
+    Box(Point p1, Point p2) {
+        this(p1.x(), p1.y(), p2.x(), p2.y());
+    }
+
+    Point topLeft() {
+        return tl;
+    }
+
+    int height() {
+        return br.x()-tl.x();
+    }
+
+    int width() {
+        return br.y()-tl.y();
+    }
+
+    boolean isEnclosed(Point p) {
+        return p.x() > tl.x() && p.x() < br.x() &&
+               p.y() > tl.y() && p.y() < br.y();
+    }
+}