Get user input in an app: Part 1

Which of the following is true about class inheritance?

Class inheritance lets you reuse code and makes your program easier to maintain.

Properties and functions of the parent class(es) are available to the child class.

You can define additional properties and functions that are specific to subclasses.

You can override parent class members in subclasses.

All of the above

Which of the following are true about abstract classes?

Choose as many answers as you see fit.

They can be extended by subclasses and implementations can be provided for abstract members of the class.

They have an implementation for all of their properties and functions.

They may have abstract properties or abstract functions.

They can be instantiated.

They are not fully implemented and cannot be instantiated.

They need to be marked with the open keyword to be extended.

Fill-in-the-blanks

Enter one or more words to complete the sentence.

The ___ is called when you create an instance of a class.

How do you mark a property to be used only inside its current class?

Use the override keyword.

Use the val keyword.

Use the private keyword.

Use the closed keyword.

It is not possible to do this.

Select all answers that are true for this XML layout when displayed on the screen. (You can sketch this out on a piece of paper first, if that helps.)

<androidx.constraintlayout.widget.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/textViewA"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="A"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    <TextView
        android:id="@+id/textViewB"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="B"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

Choose as many answers as you see fit.

TextView A appears vertically stacked on top of TextView B.

The starting edge of TextView A is aligned to the starting edge of the parent view.

The starting edge of TextView B is aligned to the starting edge of the parent view.

TextView B is horizontally and vertically centered within the parent.

The tops of TextView A and TextView B are aligned to top of the parent view.

The width of TextView A matches the width of the parent ConstraintLayout.