Java Data Types Quiz

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Questions and Answers

Which of the following data types in Java is not considered a primitive data type?

Int

Boolean

Double

String (correct)

What is the default value of a variable of type Float in Java?

0.0f (correct)

0.0d

false

Which data type's range is limited to -128 to +127 in Java?

Long

Short

Byte (correct)

Int

In Java, which keyword is used to declare a long integer variable?

long Signup and view all the answers

What does the high-order bit of an integer value indicate in Java?

The sign of the integer Signup and view all the answers

Which of the following correctly describes the range of the int data type in Java?

-2,147,483,648 to 2,147,483,647 Signup and view all the answers

Which Java primitive type is best suited for representing true or false values?

Boolean Signup and view all the answers

Which of the following data types can store both positive and negative values in Java?

Byte Signup and view all the answers

What is the correct syntax to declare a byte variable?

byte b; Signup and view all the answers

What range of integer values can the short data type hold?

-32768 to 32767 Signup and view all the answers

How is a hexadecimal number represented in Java?

Using the prefix 0x Signup and view all the answers

When performing operations with Byte and Short types, to which type are they automatically promoted?

Int Signup and view all the answers

Which character is used to denote a Long integer in Java?

L Signup and view all the answers

What is the primary advantage of using the float data type over the double data type?

Float is faster on some processors. Signup and view all the answers

In what situation would you typically use a float data type?

For real numbers needing fractional accuracy Signup and view all the answers

Which of the following is not a characteristic of the short data type?

Has a range of -128 to 127 Signup and view all the answers

What suffix is used to declare a float variable in Java?

f Signup and view all the answers

Which statement about double precision in Java is true?

It can handle larger numbers than float. Signup and view all the answers

Which of the following represents the ASCII value for the character 'F' in a byte variable?

70 Signup and view all the answers

What is the purpose of the Unicode character format in Java?

To support non-traditional characters and languages. Signup and view all the answers

How is a character variable initialized to support Unicode characters in Java?

Use single quotes for initialization. Signup and view all the answers

Which of the following statements about float and double in Java is incorrect?

Float can handle larger numbers than double. Signup and view all the answers

In the example provided, what will be printed when executing the `CharByte` class?

Gender is F Signup and view all the answers

What is a notable feature of double precision variables compared to float variables?

They have a higher precision. Signup and view all the answers

Study Notes

Data Types

Data types in Java are categorized into 2 classifications: primitive or standard data types and abstract or derived data types.
Java defines eight primitive data types.
Primitive types are built into the Java language.
Primitive types directly represent data and lack methods.
Java provides detailed instructions on how to operate on primitive types.

Integer Types

Byte: The smallest integer type, representing values between -128 and 127.
Short: Represents integer values between -32768 and 32767.
Int: Can handle larger numbers than Byte and Short, often the preferred choice for integer operations.
Long: Represents the largest integer type, holding values beyond the range of regular integers.

Floating Point Types

Floating point data types are used to represent numbers with fractional accuracy and are also referred to as "real numbers".
Float: Represented as a single-precision floating point type, suitable when limited precision and storage are desired.
Double: Represents double-precision floating points, often favored due to its increased precision and speed for math-intensive tasks.

Character Types

Character types in Java offer two representations: ASCII and Unicode.
Byte can represent characters through ASCII codes.
Char was introduced specifically to accommodate Unicode characters, which broaden support beyond ASCII's scope, including Latin-based and non-Latin-based characters.

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Description

Test your knowledge on data types in Java, including primitive and floating point types. This quiz covers the definitions and ranges of Java's integral and real number data types. Enhance your understanding of how these data types function within the Java programming language.