Java Quiz 3 : Data Types

Welcome to your Java Quiz 3 : Data Types

1. Which of the following is not provided by BigDecimal?

a) scale manipulation

b) + operator

c) rounding

d) hashing

2. BigDecimal is a part of which package?

a) java.lang

b) java.math

c) java.util

d) java.io

3. What is BigDecimal.ONE?

a) wrong statement

b) custom defined statement

c) static variable with value 1 on scale 10

d) static variable with value 1 on scale 0

4. Which class is a library of functions to perform arithmetic operations of BigInteger and BigDecimal?

a) MathContext

b) MathLib

c) BigLib

d) BigContext

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

```
public class AddDemo 
```
```
{
```

 public static void main(String args[])

```
 {
```

 BigDecimal b = new BigDecimal("23.43");

```
 BigDecimal br = new BigDecimal("24");
```

 BigDecimal bres = b.add(new BigDecimal("450.23"));

```
 System.out.println("Add: "+bres);
```
```
 
```

 MathContext mc = new MathContext(2, RoundingMode.DOWN);

 BigDecimal bdecMath = b.add(new BigDecimal("450.23"), mc);

 System.out.println("Add using MathContext: "+bdecMath);

```
 }
```
```
}
```

a) Compilation failure

b) Add: 473.66 Add using MathContext: 4.7E+2

c) Add 4.7E+2 Add using MathContext: 473.66

d) Runtime exception

6. How to format date from one form to another?

a) SimpleDateFormat

b) DateFormat

c) SimpleFormat

d) DateConverter

7. How to convert Date object to String?

a) SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd"); sdf.parse(new Date());

b) SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd"); sdf.format(new Date());

c) SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd"); new Date().parse();

d) SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd"); new Date().format();

8. How to convert a String to a Date object?

a) SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd"); sdf.parse(new Date());

b) SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd"); sdf.format(new Date());

c) SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd"); new Date().parse();

d) SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd"); new Date().format();

9. Is SimpleDateFormat thread safe?

a) True

b) False

10. How to identify if a timezone is eligible for DayLight Saving?

a) useDaylightTime() of Time class

b) useDaylightTime() of Date class

c) useDaylightTime() of TimeZone class

d) useDaylightTime() of DateTime class

11. What is the replacement of joda time library in java 8?

a) java.time (JSR-310)

b) java.date (JSR-310)

c) java.joda

d) java.jodaTime

12. How is Date stored in database?

a) java.sql.Date

b) java.util.Date

c) java.sql.DateTime

d) java.util.DateTime

13. What does LocalTime represent?

a) Date without time

b) Time without Date

c) Date and Time

d) Date and Time with timezone

14. How to get difference between two dates?

a) long diffInMilli = java.time.Duration.between(dateTime1, dateTime2).toMillis();

b) long diffInMilli = java.time.difference(dateTime1, dateTime2).toMillis();

c) Date diffInMilli = java.time.Duration.between(dateTime1, dateTime2).toMillis();

d) Time diffInMilli = java.time.Duration.between(dateTime1, dateTime2).toMillis();

15. How to get UTC time?

a) Time.getUTC();

b) Date.getUTC();

c) Instant.now();

d) TimeZone.getUTC();