add package calculator

calculator/Test.java

@@ -0,0 +1,17 @@
+package calculator;
+
+import java.util.Scanner;
+
+public class Test {
+    public static void main(String[] args) {
+        try (Scanner sc = new Scanner(System.in)) {
+            while (true) {
+                System.out.print(">>> ");
+                int a = sc.nextInt();
+                char op = sc.next().charAt(0);
+                int b = sc.nextInt();
+                System.out.println(Factory.getCompute(op).computer(a, b));
+            }
+        }
+    }
+}