Kotlin Programming MCQ for Competitive Exams, Interviews, and Certifications Page-4 section-3

Section 1 Section 2 Section 3

31.
Kotlin has two equality operators, == and ===. What is the difference?

A. == determines if two primitive types are identical. === determines if two objects are identical

B. == determines if two references point to the same object. === determines if two objects have the same value

C. == determines if two objects have the same value. === determines if two strings have the same value

D. == determines if two objects have the same value. === determines if two references point to the same object

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32.
Your code need to try casting an object. If the cast is not possible, you do not want an exception generated, instead you want null to be assigned. Which operator can safely cast a value?

A. as?

B. ??

C. is

D. as

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33.
Which is the correct declaration of an integer array with a size of 5?

A. val arrs[5]: Int

B. val arrs = IntArray(5)

C. val arrs: Int[5]

D. val arrs = Array<Int>(5)

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34.
Which command will return the length of a String in Kotlin?

A. str.length

B. length(str)

C. str.lengthOf

D. str.getLength()

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35.
Which view attribute do you use to set the width of a View so that it adjusts to fit the content?

A. android:view_width="wrap"

B. android:layout_width="wrap_content"

C. android:layout_height="wrap_content"

D. android:layout_width="match_parent"

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36.
You would like to group a list of students by last name and get the total number of groups. Which line of code accomplishes this, assuming you have a list of the Student data class? Data class Student(val firstName: String, val lastName: String)

A. Println(students.groupBy{ it.lastName }.count())

B. Println(students.groupBy{ it.lastName.first() }.fold().count())

C. Delegates.rx()

D. Println(students.groupingBy{ it.lastName.first() }.size())

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37.
Which method changes the image resource for an ImageView in Kotlin code?

A. setImageResource()

B. setImageURI()

C. setImage()

D. setImageRes()

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38.
Which of the following extension methods are used in Kotlin?

A. Read texts () & Headlines ()

B. Buffer reader ()

C. Read each line ()

D. All of the above

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39.
Which method on an Activity inflates the app's layout and makes its views available as objects?

A. onCreate()

B. setClickListener()

C. setContentView()

D. show

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40.
Which is the correct way to reference bound data in the XML layout?

A. android:text="@={myDataClass.property}"

B. android:text="@={myDataClass}"

C. android:text="@={myDataClass.property.string}"

D. android:text="@={myDataClass.bound_data.property}"

Answer & Solution Discuss in Board Save for Later

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Kotlin Programming MCQ for Competitive Exams, Interviews, and Certifications

31. Kotlin has two equality operators, == and ===. What is the difference?

Answer & Solution

32. Your code need to try casting an object. If the cast is not possible, you do not want an exception generated, instead you want null to be assigned. Which operator can safely cast a value?

Answer & Solution

33. Which is the correct declaration of an integer array with a size of 5?

Answer & Solution

34. Which command will return the length of a String in Kotlin?

Answer & Solution

35. Which view attribute do you use to set the width of a View so that it adjusts to fit the content?

Answer & Solution

36. You would like to group a list of students by last name and get the total number of groups. Which line of code accomplishes this, assuming you have a list of the Student data class? Data class Student(val firstName: String, val lastName: String)

Answer & Solution

37. Which method changes the image resource for an ImageView in Kotlin code?

Answer & Solution

38. Which of the following extension methods are used in Kotlin?

Answer & Solution

39. Which method on an Activity inflates the app's layout and makes its views available as objects?

Answer & Solution

40. Which is the correct way to reference bound data in the XML layout?

Answer & Solution

Read More Section(Kotlin Program)

31.
Kotlin has two equality operators, == and ===. What is the difference?

32.
Your code need to try casting an object. If the cast is not possible, you do not want an exception generated, instead you want null to be assigned. Which operator can safely cast a value?

33.
Which is the correct declaration of an integer array with a size of 5?

34.
Which command will return the length of a String in Kotlin?

35.
Which view attribute do you use to set the width of a View so that it adjusts to fit the content?

36.
You would like to group a list of students by last name and get the total number of groups. Which line of code accomplishes this, assuming you have a list of the Student data class? Data class Student(val firstName: String, val lastName: String)

37.
Which method changes the image resource for an ImageView in Kotlin code?

38.
Which of the following extension methods are used in Kotlin?

39.
Which method on an Activity inflates the app's layout and makes its views available as objects?

40.
Which is the correct way to reference bound data in the XML layout?