Data Types in Java - MCQs and Answers on Core Java

Questions

6 Integer is a

A Adapter class

B Inner class

C Not a class

D Wrapper class

View Answer Comment

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

View Answer Comment

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

View Answer Comment

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;

View Answer Comment

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

View Answer Comment

Answer: Option [D]

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