Java Basic data types

1. Overview

Basic type	Size	Minimum value	Maximum Value	Package Type	Defining flags
Boolean	~	~	~	Boolean	~
Char	16bits	Unicode0	Unicode2^16-1	Character	~
Byte	8bits	-128	+127	Byte	~
Short	16bits	-2^15	+2^15-1	Short	~
Int	32bits	-2^31	+2^31-1	Integer	~
Long	64bits	-2^63	+2^63-1	Long	L
Float	32bits	IEEE754	IEEE754	Float	F
Double	64bits	IEEE754	IEEE754	Double	D
void	~	~	~	Void	~

2. Member variable default value

Basic type	Default value
Boolean	False
Char	' \u0000 ' (null)
Byte	0
Short	0
Int	0
Long	0L
Float	0.0f
Double	0.0d

3. High-precision Digital

• BigInteger supports arbitrary-precision integers
• BigDecimal support for arbitrary-precision fixed-point numbers

 Packagecn.lz.base;ImportJava.math.BigDecimal;ImportJava.math.BigInteger;/*** * High-precision Digital *@authorlzzz **/ Public classJ17100802 { Public Static voidMain (string[] args) {BigInteger A1=NewBigInteger ("19181716151413121110987654321"); BigInteger A2=NewBigInteger ("12345678910111213141516171819"); //additionSystem.out.println (A1.add (A2));//31527395061524334252503826140//multiplicationSystem.out.println (a1.multiply (A2));//236811308550240594910066199325923006903586430678413779899// int a3 = 12345678910111213141516171819;        /** Exception in thread "main" java.lang.Error:Unresolved compilation problem: * The literal 12345678 910111213141516171819 of type int is out of range*/BigDecimal B1=NewBigDecimal ("12345678910111213141516171819.12345678910111213141516171819"); BigDecimal B2=NewBigDecimal ("12345678910111213141516171819.12345678910111213141516171819"); //multiplicationSystem.out.println (b1.multiply (B2));//152415787751564791571474464065423486394871076136159258042.2627449915719520852517428216262375170639839780304729768761     }}

Java Basic data types