Android Club Event-1

What does the 'super()' keyword do in Java?

• Calls the parent class constructor

• Calls the child class constructor.

• Returns the parent calss object

• Returns the child class object

Which of the following is an example of an Android layout file?

• MainActivity.java

• AndroidManifest.xml

• activity_main.xml

• styles.xml

In Java, what is the difference between an abstract class and an interface?

• An interface can have both abstract and non-abstract methods, while an abstract class can only have abstract methods

• An abstract class can have both abstract and non-abstract methods, while an interface can only have abstract methods

• An interface can have constructors, while an abstract class cannot

• An abstract class cannot have access modifiers on its methods, while an interface can

What is the difference between a 'List' and a 'Set' in Java?

• A List can contain duplicate elements, while a Set cannot

• A Set can contain duplicate elements, while a List cannot

• A List is ordered, while a Set is unordered

• A Set is ordered, while a List is unordered

What is the output of the following Python code?

x = [1, 2, 3]

y = x

x = [0, 0, 0]

print(y[0])

• 0

• 1

• 2

• 3

What is the difference between match_parent and wrap_content in Android layouts?

• match_parent fills the entire screen, while wrap_content only takes up as much space as needed

• wrap_content fills the entire screen, while match_parent only takes up as much space as needed

• match_parent and wrap_content are the same thing

• match_parent and wrap_content only apply to TextViews

What is the output of the following Python code?

x = [1, 2, 3, 4, 5]

print(x[1:4])

• [1, 2, 3, 4]

• [2, 3, 4]

• [1, 2, 3]

• [2, 3, 4, 5]

Which of the following data structures is based on the First-In-First-Out (FIFO) principle?

• Queue

• Stack

• Linked List

• Heap

What does the following string do to given string str1.

String str1 = “Exemplified”.replace(‘e’,’s’);

• Replaces single occurrences of 'e' with 's'

• Replaces all occurrences of 'e' with 's'

• Replaces single occurrences of 's' to 'e'

• Non

Identify the output of the following program.

String str = “Hellow”; System.out.println(str.indexOf(‘t));

• 0

• 1

• true

• -1