What are the basic data types in Java

1. Four integer types (byte, short, int, long)

byte: 8 bits, used to represent the smallest data unit , such as the data in the file, -128~127

short: 16 bits, -32768 ~ 32767

int: 32 bits, -2^31-1~2^31 (2.1 billion)

long: 64 bits

2. Two floating point types (float, double)

float: 32 bits, suffix F or f

double: 64 bits, the most commonly used, suffix D or d

3. A character type (char)

char: 16 bits, an integer Type, 1 character enclosed in single quotes (can be a Chinese character)

Note: It cannot be 0 characters.

Escape characters: \n Line feed \r Carriage return \t Tab character \" Double quotation marks \\ represents a \ Two characters char are connected with " " in the middle. The characters are first converted to int type internally, and then For addition operations, char is essentially a number! Binary, when displayed, is "processed" and displayed as characters.

4. A Boolean type (boolean)

true and false

5. Type conversion

char--> Automatic conversion: byte-->short-->int--> ;long-->float-->double                                                                                                                                                                                                           through Exceeding the value range

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