What are the two categories of java data types?

It is divided into basic data types and reference data types. Detailed introduction: 1. Basic data types include integer types, floating point types, character types, and Boolean types; 2. Reference data types include classes, interfaces, arrays, enumerations, and other reference types. In Java, primitive data types are passed by value, while reference data types are passed by reference. Basic data types directly store actual values, while reference data types store references (addresses) to objects.

Operating system for this tutorial: Windows 10 system, Dell G3 computer.

In Java, data types are divided into two categories: basic data types (Primitive Data Types) and reference data types (Reference Data Types).

1. Primitive Data Types:

Integer type:

byte: 8 bits, signed, range is -128 to 127.

short: 16 bits, signed, range -32768 to 32767.

int: 32 bits, signed, range -2^31 to 2^31-1.

long: 64 bits, signed, range -2^63 to 2^63-1.

Floating point type:

float: 32 bits, single precision, range is about 3.4e^-38 to 3.4e^38, precision is 6-7 decimal places.

double: 64 bits, double precision, range is approximately 1.7e^-308 to 1.7e^308, precision is 15 decimal places.

Character type:

char: 16 bits, unsigned, representing Unicode characters, ranging from 0 to 65535.

Boolean type:

boolean: used to represent logical values, with only two possible values: true or false.

2. Reference Data Types:

Class: Represents a template of an object and can create instances of the class.

Interface: A specification that defines a set of methods. A class can implement one or more interfaces.

Array: Stores a collection of elements of the same type.

Enumeration: A special class that represents a set of named constants.

Other reference types: including custom classes, interfaces, arrays, etc.

In Java, basic data types are passed by value, while reference data types are passed by reference. Basic data types directly store actual values, while reference data types store references (addresses) to objects.

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