It is time to practice object-oriented programming in Java for Android development! To practice the object oriented concepts, you can complete the following class called Calculator. This class has a few methods that you need to complete. Look at the Main class; in the main method you will find missing functionality that you have to complete.

How did you solved the missing functionality? Share it to the world!

Do you want more? You can get more Java for Android exercises in this course: Java Fundamentals for Android Development