Java Quiz on Module 1 & 2
Authored by Manzoor Ahmed
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21 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Can we create an instance of Enum outside of Enum itself?
True
False
Enum is not a class type
None of the above
Answer explanation
No, instances of Enum cannot be created outside of Enum boundary, because Enum does not have a public constructor.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What will be the output of the following Java code?
enum Season
{
WINTER, SPRING, SUMMER, FALL
};
System.out.println(Season.WINTER.ordinal());
0
1
2
3
Answer explanation
ordinal() method provides number to the variables defined in Enum.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What will be the output of the following Java code snippet?
class A
{
}
enum Enums extends A
{
ABC, BCD, CDE, DEF;
}
Runtime Error
Compilation Error
It runs successfully
EnumNotDefined Exception
Answer explanation
Enum types cannot extend class.
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Consider the following code inside TestEnum.java file
enum Branches {
Delhi(2),Chennai(3),Mumbai(3),Bangalore(5);
private int noofOffice;
private Branches(int noofOffice){
this.noofOffice=noofOffice;
}
public int getNoofOffice(){
return noofOffice;
}
}
class TestEnum{
public static void main(String[] args) {
System.out.println(Branches.Bangalore.getNoofOffice());
}
}
What will happen after compilation of the code?
Compilation error "enum constructor cannot be private
Compilation error" Cannot have variables in enum"
Code will compile sucessfully
Compilation error "enum object should be created with new keyword"
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Choose a correct statement about Autoboxing in Java?
Boxing is the process of converting a primitive data to its equivalent Wrapper class type
Unboxing is the process of converting a Wrapper class object to its equivalent primitive data type
Autoboxing is the process of converting Primitive data type to Wrapper Object type automatically. Auto-Unboxing is the process of converting Wrapper type object to Primitive type automatically.
All the above
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which does autoboxing or unboxing in Java?
Compiler
Runtime
Third party tools
None
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Choose the right statement which does autoboxing in Java?
Integer temperature1 = 100;
int temperature2 = 101;
Integer temperature1 = 100; int temperature2 = 101;
All the above
Answer explanation
As part of auto-boxing, an INT number is converted to INTEGER object automatically.
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