update,

_resources/it114105/itp4510/Lab01/Lab1.2/q2/Circle.java

@@ -0,0 +1,12 @@
+public class Circle extends Shape { // line 10
+    private int radius; // line 11
+
+    public Circle(String name, int r) {
+        super(name); // line 12
+        radius = r; // line 13
+    }
+
+    public double area() {
+        return radius * radius * 3.1416;
+    }
+}