Data types.txt

In Java, data types can be categorized into two main groups: primitive data types and reference data types.

Primitive Data Types:

byte: 8-bit integer data type. Range: -128 to 127.
short: 16-bit integer data type. Range: -32,768 to 32,767.
int: 32-bit integer data type. Range: -2^31 to (2^31)-1.
long: 64-bit integer data type. Range: -2^63 to (2^63)-1.
float: 32-bit floating-point data type. Sufficient for storing 6 to 7 decimal digits.
double: 64-bit floating-point data type. Sufficient for storing 15 decimal digits.
char: 16-bit Unicode character data type. Represents a single character.
boolean: Represents true or false.
Reference Data Types:

Objects: Instances of classes.
Arrays: Collections of elements of the same type.
examples
// Primitive data types
int intValue;
double doubleValue;
char charValue;
boolean boolValue;

// Reference data types
String stringValue; // String is a class in Java
Object objValue; // Object is the superclass of all other classes
int[] intArray; // Array of integers