Java Foundation--java Basic data types

The basic data types are detailed as follows:

Type	Key words	Length "bits"	Range of values	Description	Wrapper type
Integral type	Byte	8 (1 bytes)	[ -128,27]	Storing byte data (common)	Byte
	Short	16 (2 bytes)	[ -2^15,2^15-1]		Short
	Int	32 (4 bytes)	[ -2^31,2^31-1]	Storing ordinary integers (common)	Integer
	Long	64 (8 bytes)	[ -2^63,2^63-1]	Store long integers (common)	Long
Character type	Char	16 (2 bytes)	[0,65535]or[0,2^16-1]	Store one character (common), Unicode encoding	Character
Logic type	Boolean	8 (1 bytes)	True or False	Storing logical variables (common)	Boolean
Floating point Type	Float	32 (4 bytes)		Store floating-point numbers	Float
	Double	64 (8 bytes)		Storing double-precision floating-point numbers	Double

Note: 1. Conversion of basic data types: automatic type conversion (implicit type conversion): From small to large type conversions can be done automatically, with the following relationship: casts: From large types to small types require casts, which can result in loss of precision or overflow of 2. Data that can be directly allocated in the stack is the base data type; Reference data type , its object exists in the heap; the default integer type in 3.java is type int, and if you want to define float type, add L (L) after the value, and the default float is double-precision floating point, and to define float type, add F (f) After the value, 4.byte,char. The actual data stored in short three types are integers, using the following rules: Int direct amount can be directly assigned to Byte,char,short, as long as it does not exceed its representation range; Byte,char,short three types participate in the operation, they are converted to the int type in the calculation

Java Foundation--java Basic data types