Reprinted Delphi: Delphi and compare basic data types JAVA

Delphi comparison with basic data types JAVA

17:02:54 2015-06-20  HaydenQ  number 1715 read more

Category Column:  Delphi  JAVA  Other Essays

 

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                     **Delphi与JAVA基本数据类型对比**

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Types of	Delphi keyword	JAVA keyword	byte	Remark	range
Integer	Shortint	byte	1	Signed 8	-128..127
	Byte		1	Unsigned 8	0 .. 255
	Smallint	short	2	Signed 16	-2^15..2^15-1
	Word		2	Unsigned 16	0 .. 65535
	Longint	int	4	Signed 32	-2^63..2^63-1
	Longword		4	Unsigned 32-bit	0 .. 4294967295
	Integer	int	4	Signed 32	-2^63..2^63-1
	Cardinal		4	Unsigned 32-bit	0 .. 4294967295
	int64	long	8	Signed 64	-2^63 .. 2^63

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Types of	Delphi keyword	JAVA keyword	byte	Remark	range
character	AnsiChar (char)		1	8th	ANSI character set
	WideChar	char	2	# 16	Unicode character set

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Types of	Delphi keyword	JAVA keyword	byte	Remark	range
Boolean	Boolean	boolean	1	8th	Ord (false) = 0, Ord (true) = 1) java substantially not converted to other data types
	ByteBool		1	8th	Words (false) = 0, words (true) <> 0)
	WordBool		2	# 16	Words (false) = 0, words (true) <> 0)
	LongBool		4	# 32	Words (false) = 0, words (true) <> 0)

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Types of	Delphi keyword	JAVA keyword	byte	Remark	range
Real	Real		8	Accuracy 15..16
	Real48		6	Accuracy 11..12 backward compatibility
	Single	float	4	Accuracy 7..8
	Double	double	8	Accuracy 15..16
	Extended		10	Accuracy 19..20
	Comp		8	Accuracy 19..20
	Currency		8	Accuracy 19..20

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string does not belong to the basic data types

Types of	Delphi keyword	JAVA keyword	byte	Remark	range
String	Short String		255 characters	ANSIChar type (standard character type)	2..256B
	AnsiString		2 ^ 31 characters	ANSIChar type	4B..2GB
	WideString		About 2 ^ 30 characters	WideChar character type	4B..2GB
	String			String String, depending on the value of the compiled instructions, $$ H + (indeed province) represents a long string (The ANSIString type) $ H-Representative ShortString

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