INTRODUCTION

SELF REVIEW: PRACTICE USING COMPANION OBJECTS

1. What was the output when you ran your solution? 

2. What is the output of the program if you add another OrderItem in the list – Ice cream (4$)?

3. How can you call a function fun sayHello() defined within a companion object of a class ‘Greeting’? 

4. Which of the following core concepts are covered in this course? Check all that apply.

5. Your current understanding of the programming fundamentals in Kotlin should already include which of these items? Check all that apply

6. When you first create an Android Studio project you must choose at least one activity to include. 

7. A Singleton is an object-oriented pattern where a class can have only one object at a time.

8. A singleton object can inherit another class or interface.

9. Which of the following are true about companion objects? Select all that apply.

SELF REVIEW: IMPLEMENTING START FUNCTION IN AN ACTIVITY

1. In the companion object of IngredientsActivity, you have a start function. In that function, you initialize an Intent. Which of the following calls did you use?

2. In the onCreate function of the IngredientsActivity class, replace the Pasta string with Pizza. Run the code and tap the Pasta button. What happens?

3. Which of the following will start IngredientsActivity from MainActivity?   Select all that apply.

4. Which of these are good examples of constants?

5. How would you set up an intent from an activity named ‘FirstActivity’ with its destination as ‘SecondActivity’, where the current activity instance is denoted by ‘this’ keyword? 

6. You wish to set up an intent and pass a string valued “Hello World” with its key as “data” to an activity that is to be launched, what is the correct syntax?

KNOWLEDGE CHECK: OBJECT DECLARATION

1. RestaurantMenu is a Kotlin object with a mutable list. Which of the following statements is true? Select all that apply.  

2. Little Lemon has only one restaurant. Which entity would best represent it?

3. Which of the following statements about companion objects are correct?

MODULE QUIZ: KOTLIN AND ANDROID

1. Which option demonstrates the correct way to initialize an object in Kotlin? 

2. Which option represents the correct way to call the function getNumberOfWheels defined in the object below:

object Car {
fun getNumberOfWheels() = 4
}

3. What is the correct syntax to call the function printHello defined in the code below:

class Outer {
    class Nested {
        fun printHello() {
            println("Hello")
        }
    }
}

4. What is the correct syntax to call the function printHello defined in the code below:

class Outer {
    inner class Inner {
        fun printHello() {
            println("Hello")
        }
    }
}

5. Which of these are correct ways to access the variable wheelCount in the code below:

class Car {
    companion object {
        val wheelCount = 4
    }
}

6. When should you use a companion object in a class?

7. Which of the following keywords is used to declare a constant in Kotlin?

8. Which of these is correct if you wish to navigate from an activity called SourceActivity to another activity called  DestinationActivity in Android? 

9. What is the right way to use the function startActivity to start an activity? 

10. Which one of the below lines can you use to pass an argument to an activity? (Assume an instance of Intent can be referenced using intent variable)

Interactive CSS CONCLUSION