Java Data Types

Here are 10 essential multiple-choice questions on Java Data Types, covering key concepts.

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Question 1

What is the default value of a boolean in Java?

  • true

  • false

  • null

  • 0

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Question 2

Which data type is best for storing the ASCII value of a character?

  • char

  • byte

  • int

  • short

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Question 3

What will be the output of this code?

Java 
int a = 7;
double b = 2;
System.out.println(a / b);

  • 3

  • 3.5

  • 3.0

  • Error

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Question 4

Which of the following is a valid declaration of a float data type?

  • float f = 10.5;

  • float f = 10.5f;

  • float f = "10.5";

  • float f = (10.5);

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Question 5

What will be the output of this code?

Java 
byte x = 127;
x++;
System.out.println(x);

  • 128

  • 127

  • -128

  • Compilation Error

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Question 6

Which of the following combinations will NOT compile?

  • long l = 100L;

  • int i = 10000000000;

  • double d = 1.2e3;

  • short s = 100;

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Question 7

What is the size of the char type in Java?

  • 8 bits

  • 32 bits

  • 16 bits

  • Depends on the platform

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Question 8

What will be printed by the following code?

Java 
float f = 5.6f;
int i = (int) f;
System.out.println(i);

  • Compilation Error

  • 5.6

  • 6

  • 5

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Question 9

What is the result of this code?

Java 
int a = 1_000_000;
float b = a;
System.out.println(b == a);

  • true

  • false

  • Compilation Error

  • Runtime Error

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Question 10

What will be the output of the following code?

Java 
long l = 2147483648L;
int i = (int) l;
System.out.println(i);

  • 2147483648

  • -2147483648

  • Overflow

  • Compilation Error

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There are 10 questions to complete.

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