update,

it114105/itp4510/Lab01/Lab1.2/q2/Square.java

@@ -0,0 +1,12 @@
+public class Square extends Shape { // line 6
+    private int side; // line 7
+
+    public Square(String name, int side) {
+        super(name); // line 8
+        this.side = side; // line 9
+    }
+
+    public double area() {
+        return side * side;
+    }
+}