Java Beginner (Level 3)

Q 1.

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

True False

Q 2.

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

Sorted in the order of declaration of Enums Sorted in alphabetical order of Enums Sorted based on order() method Sorted in descending order of names of Enums

Q 3.

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

Syntax Memory usage Garbage creation Precision

Q 4.

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);

0.009999999999999998 0.01 0.01 0.009999999999999998 0.01 0.01 0.009999999999999998 0.009999999999999998

Q 5.

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

MathContext MathLib BigLib BigContext

Q 6.

How to convert Date object to String?

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

Q 7.

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

useDaylightTime() of Time class useDaylightTime() of Date class useDaylightTime() of TimeZone class useDaylightTime() of DateTime class

Q 8.

How to get UTC time?

Time.getUTC(); Date.getUTC(); Instant.now(); TimeZone.getUTC();

Q 9.

Which of these can be returned by the operator &?

Integer Boolean Character Integer or Boolean

Q 10.

Which of these can not be used for a variable name in Java?

identifier keyword identifier & keyword none of the mentioned

Q 11.

What will be the output of the following Java program?

 class array_output 
    { 
        public static void main(String args[])
        { 
            int array_variable[] = new int[10];
            for (int i = 0; i < 10; ++i) 
            { 
                array_variable[i] = i / 2;
                array_variable[i]++;
                System.out.print(array_variable[i] + " ");
                i++;
            }
        }
    }

0 2 4 6 8 1 2 3 4 5 0 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 10

Q 12.

Which of these is necessary condition for automatic type conversion in Java?

The destination type is smaller than source type The destination type is larger than source type The destination type can be larger or smaller than source type None of the mentioned

Q 13.

What is the prototype of the default constructor of this Java class?

public class prototype { }

prototype( ) prototype(void) public prototype(void) public prototype( )

Q 14.

What will be the output of the following Java code?

class char_increment {
    public static void main(String args[]) {
        char c1 = 'D';
        char c2 = 84;
        c2++;
        c1++;
        System.out.println(c1 + " " + c2);
    }
}

E U U E V E U F

Q 15.

Which of these is an incorrect array declaration?

int arr[] = new int[5] int [] arr = new int[5] int arr[] = new int[5] int arr[] = int [5] new

Instruction