Java Literals Quiz

Questions and Answers

Which prefix is used to indicate a binary integer literal in Java?

0b (correct)

What type of literals are used to initialize variables of type float and double in Java?

Floating-point literals (correct)

Integer literals

String literals

Character literals

Which of the following represents an octal integer literal in Java?

0b1011

045 (correct)

0x1F

Which character in Java is used to represent the new line escape sequence?

\n Signup and view all the answers

Which of the following is a valid string literal in Java?

"Hello" Signup and view all the answers

What does '0x' indicate when used in a variable declaration in Java?

Hexadecimal literal Signup and view all the answers

Which of the following correctly matches the literal type to its example?

Floating-point - 3.4F Signup and view all the answers

Which of the following escape sequences can be used as a character literal in Java?

\t Signup and view all the answers

Study Notes

Java Literals

Literals represent fixed values directly used in code without needing computation.
Examples of literals:
- int a = 1;
- float b = 2.5;
- char c = 'F';

Integer Literals

Numeric values without fractional or exponential parts.
Four types:
- Binary (base 2), indicated by 0b
- Decimal (base 10)
- Octal (base 8), indicated by a leading 0
- Hexadecimal (base 16), indicated by 0x
Examples:
- Binary: int binaryNumber = 0b10010;
- Octal: int octalNumber = 027;
- Decimal: int decNumber = 34;
- Hexadecimal: int hexNumber = 0x2F;
Used to initialize integer-type variables: byte, short, int, long.

Floating-point Literals

Numeric literals representing fractional or exponential forms.
Examples:
- double myDouble = 3.4;
- float myFloat = 3.4F;
- Scientific notation: double myDoubleScientific = 3.445e2; // 344.5
Used to initialize float and double type variables.

Character Literals

Represented by Unicode characters enclosed in single quotes.
Example: char letter = 'a';
Escape sequences can be used, such as:
- \b (backspace)
- \t (tab)
- \n (new line)

String Literals

Sequences of characters enclosed in double quotes.
Examples:
- String str1 = "Java Programming";
- String str2 = "Programiz";

Boolean Literals

Used to initialize boolean data types with two possible values: true and false.
Examples:
- boolean flag1 = false;
- boolean flag2 = true;

Description

Test your knowledge of Java literals, including integer, floating-point, and character literals. Understand how these fixed values are utilized in code through various numerical systems like binary and hexadecimal. Dive into examples and see if you can identify the correct uses of different types of literals.