Quiz 7

Question 1

What is the output of the following code:

class A{
public void p(){
System.out.println(“1”);
}
public void q(){
System.out.println(“2”);
}
public void r(){
p();
}
}
class B extends A{
public void p(){
System.out.println(“3”);
}
}
class C extends B{
public void q(){
System.out.println(“4”);
}
}

public class QuizMain {

public static void main(String[] args) {
    A a = new C();
    a.r();
}

}

3, 4, 2, or 1?

Answer 1

3

Question 2

When there is a method overloading in Java, the method that gets called is always determined at run-time based on the method signature, T/F?

Answer 2

False

Question 3

Java does not support operator overloading, T/F?

Answer 3

True

Question 4

Constructors in Java must have a return type of void, T/F?

Answer 4

False

Question 5

Simula is the first purely object-oriented language. Everything in Simula is an object, including numbers and code itself, T/F?

Answer 5

False

Question 6

What is the output of the following Java code:

String a = new String(“hello”);

String b = new String(“hello”);

System.out.println(a == b);

True or false?

Answer 6

False

Question 7

Which of the following class does not implement List interface in Java?
HashSet, ArrayList, Vector, or LinkedList?

Answer 7

HashSet

Question 8

In Java, an interface can extend other interfaces using the extends keyword, T/F?

Answer 8

True

Question 9

Java supports multiple inheritance, meaning a class can inherit from more than one base class, T/F?

Answer 9

False

Question 10

In Java, all classes inherit from the ________ class by default.
Map, iterable, list, or object?

Answer 10

Object