Deep Anatomy of Java data types

Native type	Number of occupying positions	Whether to sign bit	Minimum value	Maximum Value	Default value	Packing class	Note
Boolean	1	Not with	——	——	False	Boolean	The Boolean type is the lonely queen she can't convert with other types
Byte	8	Take	-2^7=-128=byte.min_value	2^7-1=127=byte.max_value	0	Byte	Frequently used in IO streams
Char	16	Not with	' \u0000 ' =0=character.min_value	' \uffff ' =2^15*2-1=65535=character.max_value	' \u0000 '	Character	It is recommended that you use the wrapper class character instead of the original type Char,char a character only as a character, using character to determine if a character is a secondary character. such as this I cannot knock out the symbol:
Short	16	Take	-2^15=short.min_value	2^15-1=short.max_value	0	Short	Historical legacy types, no longer being used
Int	32	Take	-2^31=integer.min_value	2^31-1=integer.max_value	0	Integer
Long	64	Take	-2^63=long.min_value	2^63-1=long.max_value	0	Long	Use in cases where int cannot be stored
Float	32	Take	1.4e-45f=float.min_value	3.4028235e38=float.max_value	0.0f	Float	Use when high-precision requirements for memory requirements are not high
Double	64	Take	4.9e-324=double.min_value	1.7976931348623157e308==double.max_value	0.0d	Double
Note	Although float is the same as the int placeholder, but float can store a value much larger than int, see Integer.max_value and Float.max_value, not only that float is much larger than long, but also that Double is n times greater than long. Therefore, a long can not be stored in a number in a float or double.	Here the Boolean and char unsigned number is my own addition, although the Java core technology Volume one says: "Java does not have any unsigned type", but the Boolean only one, can only put themselves, how to put the sign bit? From the value range of char, Char is definitely a range of unsigned numbers!	Nem represents N*10 's M-Square, ne-m represents one of the M-sub-points of n*10 Java Core Technology Volume one indicates the value range of float type is ±3.40282347e38 personal feeling is wrong!	Nem represents N*10 's M-Square, ne-m represents one of the M-sub-points of n*10 Java Core Technology Volume one indicates the value range of float type is ±3.40282347e38 personal feeling is wrong!

Deep Anatomy of Java data types