Java Quiz 2 : Data Types

Welcome to your Java Quiz 2 : Data Types

1. What is the order of variables in Enum?

a) Ascending order

b) Descending order

c) Random order

d) Depends on the order() method

2. Can we create an instance of Enum outside of Enum itself?

a) True

b) False

3. What will be the output of the following Java code?

```
 enum Season 
```
```
 {
```
```
 WINTER, SPRING, SUMMER, FALL
```
```
 };
```

 System.out.println(Season.WINTER.ordinal());

a) 0

c) 2

d) 3

4. If we try to add Enum constants to a TreeSet, what sorting order will it use?

a) Sorted in the order of declaration of Enums

b) Sorted in alphabetical order of Enums

c) Sorted based on order() method

d) Sorted in descending order of names of Enums

5. What will be the output of the following Java code snippet?

```
class A
```
```
{
```
```
 
```
```
}
```
```
 
```
```
enum Enums extends A
```
```
{
```
```
 ABC, BCD, CDE, DEF;
```
```
}
```

a) Runtime Error

b) Compilation Error

c) It runs successfully

d) EnumNotDefined Exception

6. What will be the output of the following Java code snippet?

```
 enum Levels 
```
```
{
```
```
 private TOP,
```
```
 
```
```
 public MEDIUM,
```
```
 
```
```
 protected BOTTOM;
```
```
}
```

a) Runtime Error

b) EnumNotDefined Exception

c) It runs successfully

d) Compilation Error

7. What will be the output of the following Java code snippet?

```
enum Enums
```
```
{
```
```
 A, B, C;
```
```
 
```
```
 private Enums()
```
```
 {
```
```
 System.out.println(10);
```
```
 }
```
```
}
```
```
 
```
```
public class MainClass
```
```
{
```
```
 public static void main(String[] args)
```
```
 {
```
```
 Enum en = Enums.B;
```
```
 }
```
```
}
```

a) 10 10 10

b) Compilation Error

c) 10 10

d) Runtime Exception

8. Which method returns the elements of Enum class?

a) getEnums()

b) getEnumConstants()

) getEnumList()

d) getEnum()

9. Which class does all the Enums extend?

a) Object

b) Enums

c) Enum

d) EnumClass

10. Are enums are type-safe?

a) True

b) False

11. Which of the following is the advantage of BigDecimal over double?

a) Syntax

b) Memory usage

c) Garbage creation

d) Precision

12. Which of the below data type doesn’t support overloaded methods for +,-,* and /?

a) int

b) float

c) double

d) BigDecimal

13. What will be the output of the following Java code snippet?

```
 double a = 0.02;
```
```
 double b = 0.03;
```
```
 double c = b - a;
```
```
 System.out.println(c);
```
```
 
```

 BigDecimal _a = new BigDecimal("0.02");

 BigDecimal _b = new BigDecimal("0.03");

```
 BigDecimal _c = b.subtract(_a);
```
```
 System.out.println(_c);
```

a) 0.009999999999999998 0.01

b) 0.01 0.009999999999999998

c) 0.01 0.01

d) 0.009999999999999998 0.009999999999999998

14. What is the base of BigDecimal data type?Add description here!

a) Base 2

b) Base 8

c) Base 10

d) Base e

15. What is the limitation of toString() method of BigDecimal?

a) There is no limitation

b) toString returns null

c) toString returns the number in expanded form

d) toString uses scientific notation

Time is Up!