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Data Types in Java - Multiple Choice Questions and Answers

Questions
6 Integer is a
A Adapter class
B Inner class
C Not a class
D Wrapper class

Answer: Option [D]

Byte, Short, Integer, Long, Character, Boolean, Double, Float are called wrapper class in Java.

7 Which of the following variable declaration would not compile in Java program?
A intVAR;
B intvar1;
C int 1_var;
D All are correct

Answer: Option [C]

It is illegal to declare a variable name by using integer in the start place.

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8 Among these expressions, which is(are) of type String?
A "0"
B '0'
C [A] and [B]
D None of these

Answer: Option [A]

"0" is correct. Because String literals are enclosed within double quotes.

9 Which of the following line will not compile assuming b1, b2 and b3 are byte variables and J is Int variable?
A b1 = 3;
B b3 = b1 * b2;
C b3 = 10 * b1;
D b2 = (byte) j;

Answer: Option [C]

10 is an integer variable and b1 is a byte variable. The multiplication of these two results an integer variable which cannot be stored in b3

10 Which are the valid declarations for an integer literal?
I. 0
II. -5
III. 0416
IV. 0xabcdef
A (I) and (II)
B (I), (II) and (III)
C (IV)
D All of these

Answer: Option [D]

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