Java starts from zero the next day

April 28, 2015 night, Zhuhai. Clear

basic data types for Java

Integer (integer), floating-point (float), Boolean (Boolean), character-type (char)

1. Integral type (integer)

Java's most basic data type, using int to represent a range that has a short long int byte

1.1 Decimal (most common and most commonly used in life)

int i = 100; int j=-120;

1.2 Octal (the binary rule is full 8 in 1, including 0-7 of 8 digits.) Adding a 0 to an integer is an octal number)

int i = 08; int j=-12;

1.3 Hex (the binary rule is full 16 in 1, including 0-9 and a-f components. Integer preceded by a 0x is hexadecimal number)

int i =0x05; int j = -0XFFAA;

Range of integer values

Type	-bit	Bytes	Range of values
Byte	8	1	-27 ~ 27-1
Short	16	2	-215 ~ 215-1
Int	32	4	-231 ~ 231-1
Long	64	8	-263 ~ 263-1

Note: The integer data type pattern is int

2 float type (float)

Single-precision floating-point type

float F = 11.21F; Float F1 = -17.15f

Double-precision floating-point type

Double d = 11.11223D; double-17.15555;

Value access for floating-point type

Type	-bit	Bytes	Range of values
Float	32	4	±40282347e+38f
Double	64	8	±1.79769313486231570e+308

Note: There is no letter at the end of the floating-point type, and the data is a double-precision floating point.

3. Character type (char)

A character type is a type of data that is a character. Char type represents a character, 16 bits, two characters, for example ' a ' person ' and so on

char c = ' C '; Represents a character

char c = ' \u005e ';//Represents a Unicode code

Char c =565;//represents an integer

Char The underlying implementation is also a numeric type, so you can convert to int type

4. Boolean type (Boolean)

A Boolean is a type of data that is judged. True and false, use True and false in Java to denote true and false

Boolean b =true;

Boolean b =false;

I believe you have looked at me this basic data type can have a little awareness, for the content of the back to continue efforts! Good night. A rookie greeting.

Java starts from zero the next day