CMP Conversion Amanuensis

This Applet will help you write Java code. Instead of memorising the 400 conversion functions between the 20 basic types, just use this amanuensis to generate the code, the paste it into your source.

This Applet requires one of the following up-to-date browsers:

	Click the corresponding browser icon to download the latest browser software
	Opera 7.5 with the Java 1.4.2_04 Plug-in
	Mozilla 1.6 with the Java 1.4.2_04 Plug-in
	Netscape 7.1 with the Java 1.4.2_04 Plug-in
	Microsoft Internet Explorer 6.0.2800 with the Java 1.4.2_04 Plug-in
	Sun's Java 1.4.2_04 Plug-in add on

details about the current version.

download source and executable to run this Applet on your own machine as a stand-alone application.

If the Applet does not work for you, try the 20x20 matrix crib sheet

conversion table crib sheet for Java 1.4- ¤ conversion table crib sheet for Java 1.5+

Primitives

Primitive variables include boolean, char, byte, short, int, long, float and double. Strings, arrays and Objects are not considered primitives.

Type	Signed?	Bits	Bytes	Lowest	Highest	Mnemonic
boolean	n/a	1	1	false	true	zero/one
char	unsigned Unicode	16	2	'\u0000' [0] aka Character.MIN_VALUE	'\uffff' [2¹⁶-1] aka Character.MAX_VALUE	Unicode chars are twice as big as C's.
byte	signed	8	1	-128 [-2⁷] aka Byte.MIN_VALUE	+127 [2⁷-1]aka Byte.MAX_VALUE	Bytes are signed, so half the usual 255 range.
short	signed	16	2	-32,768 [-2¹⁵] aka Short.MIN_VALUE	+32,767 [2¹⁵-1] aka Short.MAX_VALUE	32K
int	signed	32	4	-2,147,483,648 [-2³¹] aka Integer.MIN_VALUE	+2,147,483,647 [2³¹-1] aka Integer.MAX_VALUE	2 gig
long	signed	64	8	-9,223,372,036,854,775,808 [-2⁶³] aka Long.MIN_VALUE	+9,223,372,036,854,775,807 [2⁶³-1] aka Long.MAX_VALUE	9 exabytes, or 9 billion gig
float	signed exponent and mantissa	32	4	±1.40129846432481707e-45	±3.40282346638528860e+38 with 6 to 7 significant digits of accuracy.	rough float
double	signed exponent and mantissa	64	8	±4.94065645841246544e-324	±1.79769313486231570e+308 with 14 to 15 significant digits of accuracy.	high precision float

Primitives vs Immutable Wrapper Objects

Contrast that table of primitives, with this table of basic Java types:

Mutable Primitives	Immutable Objects
boolean	Boolean
ordinary signed byte	Byte
unsigned byte	Byte
short	Short
char	Character
int	Integer
long	Long
float	Float
double	Double
char[]	String

conversion table for Java 1.4- ¤ conversion table for Java 1.5+ ¤ conversion

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