Create 11B. Write class Calculator

Week 4: Writing classes/11B. Write class Calculator

@@ -0,0 +1,91 @@
+Write the class Calculator. The class must have the following properties:
+Private integer type attribute result
+a void type method add(int number), which adds the given number to the result
+Methods subtract(int number) and multiply(int number) that work in a similar way.
+The method inverse(), which converts the result to the inverse (e.g. 3 is converted to -3)
+Get method getResult(), which returns the current result
+
+Note! Since the test class is public, the class Calculator cannot be. So do not use the attribute public in its definition.
+
+
+
+
+
+import java.util.Random;
+import java.lang.reflect.Field;
+
+public class Test{
+    public static void main(String[] args){
+        
+    }
+}
+
+class Calculator {
+
+    private int result;
+
+    // removed 'static'
+    // 'static' means the method belongs to the class, not an object instance of the class
+    // removing 'static' allows us to use 'this' to access instance variables/attributes
+    public void add(int number) {
+        this.result += number;
+    }
+
+    public void subtract(int number) {
+        this.result -= number;
+    }
+
+    public void multiply(int number) {
+        this.result *= number;
+    }
+
+    public void inverse() {
+        this.result = -1 * this.result;
+    }
+
+    public int getResult() {
+        return this.result;
+    }
+}
+
+
+
+
+
+
+
+Testing class Calculator...
+Constructor Calculator() found, object created!
+
+Checking attribute...
+Attribute result found!
+Attribute type: int
+Attribute private: true
+Testing methods....
+Calling add(12)
+Result is now: 12
+Calling add(2)
+Result is now: 14
+Calling add(12)
+Result is now: 26
+
+Calling subtract(3)
+Result is now: 23
+Calling subtract(23)
+Result is now: 0
+Calling subtract(12)
+Result is now: -12
+
+Calling multiply(-1)
+Result is now: 12
+Calling multiply(-1)
+Result is now: -12
+Calling multiply(6)
+Result is now: -72
+
+Calling inverse()
+Result is now: 72
+Calling inverse()
+Result is now: -72
+
+