Comprehensive analysis of basic data types in JAVA foundation

Basic data types:

1. Numeric type

1) Integer:

1. byte is a byte, 8 bits, with a value range of 0 ~255, used to store binary data.
2. Short is two bytes, 16 bits, and the value range is between -32768~32767.
3. Int four bytes, 32 bits, the value range is between -2147483648~2147483648
4. long eight bytes, 64 bits, the value range is between -9,223,372,036,854,775,808 ~9,223,372,036,854,775,807

2) Floating point type:

1, float, four bytes, single precision floating point number, range is -2^128
~ +2^128
2. Double, eight bytes double-precision floating point number, range is -2^1024
~ +2^1024

2. Character type: char, a set of data

3. Boolean type: boolean, only two values, one true and one false

4. String: String,

Basic data type conversion:

Low-level to Advanced can automatically convert
char→int→long→float→double
byte→short→int

force conversion
double num1=78.2;
int num2=(double)num1

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