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Questions and Answers
What is the range of a byte in Java?
-128 to 127
What is the range of a short in Java?
-32,768 to 32,767
What is the range of an int in Java?
-2,147,483,648 to 2,147,483,647
What is the range of a long in Java?
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What type of number is a float in Java?
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What is the precision of a double in Java?
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What are the two possible values of a boolean in Java?
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What does a char represent in Java?
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What is a class in Java?
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What is an object in Java?
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A class can contain fields (variables) to store data and ______ to perform operations on that data.
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Study Notes
Basic Data Types
-
Byte: A signed 8-bit integer; range from -128 to 127. Example:
byte b = 100; -
Short: A signed 16-bit integer; range from -32,768 to 32,767. Example:
short s = 5000; -
Int: A signed 32-bit integer; range from -2,147,483,648 to 2,147,483,647. Example:
int i = 100000; -
Long: A signed 64-bit integer; range from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807. Example:
long l = 1234567890L; -
Float: A single-precision 32-bit floating-point number; range of approximately 1.4E-45 to 3.4E+38 and precision of about 7 decimal digits. Example:
float f = 3.14f; -
Double: A double-precision 64-bit floating-point number; range of approximately 4.9E-324 to 1.8E+308 with precision of about 15 decimal digits. Example:
double d = 3.14159; -
Boolean: Represents a logical value; can be either true or false. Example:
boolean b1 = true;,boolean b2 = false; -
Char: Represents a single Unicode character; range from '\u0000' (0) to '\uffff' (65,535). Example:
char c = 'A';
Reference Data Types
- Built on primitive data types; includes classes, interfaces, and arrays.
- Classes: Act as templates for creating objects; encapsulate data and behavior within fields (variables) and methods (functions).
- Objects are instances of classes, each with unique field values.
- Example class definition:
public class Person { private String name; }
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Description
This quiz covers the fundamental data types in Java programming, focusing on primitive types such as byte, short, int, and long. Each data type's characteristics, range, and usage will be assessed. Test your knowledge on the building blocks of Java data representation.
