1 files changed, 9 insertions, 0 deletions
diff --git a/oop/03-interfaces/CalculatorTest.java b/oop/03-interfaces/CalculatorTest.java
new file mode 100644
index 0000000..e2340dd
--- /dev/null
+++ b/oop/03-interfaces/CalculatorTest.java
@@ -0,0 +1,9 @@
+public class CalculatorTest {
+
+	public static void main(String[] args) {
+		Calculator cal = new BasicCalculator();
+
+		System.out.println(cal.add(1, 3));
+		//....
+	}
+}