void add(int number); double getResult();

Week 6: Methods of OO Programming/05B. Write an interface class Calculator

@@ -0,0 +1,62 @@
+Write an interface class Calculator.
+
+The class has the following properties:
+Methods add, subtract, multiply, and divide. 
+All methods are of void type and each takes a single integer as a parameter.
+A method getResult, which has no parameters. 
+This method returns a double-type floating-point number.
+
+
+
+
+import java.util.Random;
+
+public class Test{
+    public static void main(String[] args){
+        final Random r = new Random();
+        
+        System.out.println("Testing the calculator interface...");
+        
+        Calculator c = new CalculatorTest();
+        
+        c.add(1);
+        System.out.println("add(int number) ok");
+        
+        c.subtract(1);
+        System.out.println("subtract(int number) ok");
+
+        c.multiply(1);
+        System.out.println("multiply(int number) ok");
+        
+        c.divide(1);
+        System.out.println("divide(int number) ok");
+        
+        double d = c.getResult();
+        System.out.println("getResult() ok");
+
+    }
+}
+
+
+
+
+//ADD
+interface Calculator {
+    void add(int number);
+    void subtract(int number);
+    void multiply(int number);
+    void divide(int number);
+    double getResult();
+}
+
+
+
+
+Testing the calculator interface...
+add(int number) ok
+subtract(int number) ok
+multiply(int number) ok
+divide(int number) ok
+getResult() ok
+
+