Java Multiple Choice Questions & Answers on Character and Boolean Data Types for Freshers

1. What is the numerical range of a char data type in Java?

a) -128 to 127
b) 0 to 256
c) 0 to 32767
d) 0 to 65535

Answer:d

Explanation: Char occupies 16-bit in memory, so it supports 2^16 i:e from 0 to 65535.

2. Which of these coding types is used for data type characters in Java?

a) ASCII
b) ISO-LATIN-1
c) UNICODE
d) None of the mentioned

Answer:c

Explanation: Unicode defines fully international character set that can represent all the characters found in all human languages. Its range is from 0 to 65536.

3. Which of these values can a boolean variable contain?

a) True & False
b) 0 & 1
c) Any integer value
d) true

Answer:a

Explanation: Boolean variable can contain only one of two possible values, true and false.

4. Which of these occupy first 0 to 127 in Unicode character set used for characters in Java?

a) ASCII
b) ISO-LATIN-1
c) None of the mentioned
d) ASCII and ISO-LATIN1

Answer:d

Explanation: First 0 to 127 character set in Unicode are same as those of ISO-LAIN-1 and ASCII.

5. Which one is a valid declaration of a boolean?

a) boolean b1 = 1;
b) boolean b2 = ‘false’;
c) boolean b3 = false;
d) boolean b4 = ‘true’

Answer:c

Explanation: Boolean can only be assigned true or false literals.

6. What is the output of this program?

1.     class array_output {

2.         public static void main(String args[]) 

3.         {    

4.             char array_variable [] = new char[10];

5.      for (int i = 0; i < 10; ++i) {

6.                 array_variable[i] = 'i';

7.                 System.out.print(array_variable[i] + "" );

8.                 i++;

9.             }

10.         } 

11.     }

a) i i i i i
b) 0 1 2 3 4
c) i j k l m
d) None of the mentioned

Answer:a

7. What is the output of this program?

1.     class mainclass {

2.         public static void main(String args[]) 

3.         {

4.             char a = 'A';

5.             a++;

6.      System.out.print((int)a);

7.         } 

8.     }

a) 66
b) 67
c) 65
d) 64

Answer:a

Explanation: ASCII value of ‘A’ is 65, on using ++ operator character value increments by one.

8. What is the output of this program?

1.     class mainclass {

2.         public static void main(String args[]) 

3.         {

4.             boolean var1 = true;

5.      boolean var2 = false;

6.      if (var1)

7.          System.out.println(var1);

8.      else

9.          System.out.println(var2);

10.        } 

11.     }

a) 0
b) 1
c) true
d) false

Answer:c

9. What is the output of this program?

1.     class booloperators {

2.         public static void main(String args[]) 

3.         {

4.             boolean var1 = true;

5.      boolean var2 = false;

6.      System.out.println((var2 & var2));

7.         } 

8.     }

a) 0
b) 1
c) true
d) false

Answer:d

Explanation: boolean ‘&’ operator always returns true or false. var1 is defined true and var2 is defined false hence their ‘&’ operator result is false.

10. What is the output of this program?

1.     class asciicodes {

2.         public static void main(String args[]) 

3.         {

4.             char var1 = 'A';

5.      char var2 = 'a';

6.      System.out.println((int)var1 + " " + (int)var2);

7.         } 

8.     }

a) 162
b) 65 97
c) 67 95
d) 66 98

Answer:b

Explanation:ASCII code for ‘A’ is 65 and for ‘a’ is 97.