Double class « Double « Numbers « Development

The Double class wraps a value of the primitive type double in an object. An object of type Double contains a single field whose type is double.

Double class provides several methods for converting a double to a String and a String to a double.

Type	Field	Summary
static int	MAX_EXPONENT	Maximum exponent a finite double variable may have.
static double	MAX_VALUE	A constant holding the largest positive finite value of type double.
static int	MIN_EXPONENT	Minimum exponent a normalized double variable may have.
static double	MIN_NORMAL	A constant holding the smallest positive normal value of type double.
static double	MIN_VALUE	A constant holding the smallest positive nonzero value of type double.
static double	NaN	A constant holding a Not-a-Number (NaN) value of type double.
static double	NEGATIVE_INFINITY	A constant holding the negative infinity of type double.
static double	POSITIVE_INFINITY	A constant holding the positive infinity of type double.
static int	SIZE	The number of bits used to represent a double value.
static Class	TYPE	The Class instance representing the primitive type double.

Double class Constructor

Constructor	Summary
Double(double value)	Creates a Double object that represents the primitive double argument.
Double(String s)	Creates a Double object that represents the double value represented by the string.

Return double value as byte, double, float, int, long, short

Return	Method	Summary
byte	byteValue()	Returns the value of this Double as a byte (by casting to a byte).
double	doubleValue()	Returns the double value of this Double object.
float	floatValue()	Returns the float value of this Double object.
int	intValue()	Returns the value of this Double as an int (by casting to type int).
long	longValue()	Returns the value of this Double as a long (by casting to type long).
short	shortValue()	Returns the value of this Double as a short (by casting to a short).

Compare two double values

Return	Method	Summary
static int	compare(double d1, double d2)	Compares the two specified double values.
int	compareTo(Double anotherDouble)	Compares two Double objects numerically.
boolean	equals(Object obj)	Compares this object against the specified object.

Return	Method	Summary
boolean	isInfinite()	Returns true if this Double value is infinitely large in magnitude, false otherwise.
static boolean	isInfinite(double v)	Returns true if the specified number is infinitely large in magnitude, false otherwise.
boolean	isNaN()	Returns true if this Double value is a Not-a-Number (NaN), false otherwise.
static boolean	isNaN(double v)	Returns true if the specified number is a Not-a-Number (NaN) value, false otherwise.

Return	Method	Summary
static double	parseDouble(String s)	Returns a new double initialized to the value represented by the specified String, as performed by the valueOf method of class Double.
static Double	valueOf(double d)	Returns a Double instance representing the specified double value.
static Double	valueOf(String s)	Returns a Double object holding the double value represented by the argument string s.

Return	Method	Summary
String	toString()	Returns a string representation of this Double object.
static String	toString(double d)	Returns a string representation of the double argument.

Return	Method	Summary
static String	toHexString(double d)	Returns a hexadecimal string representation of the double argument.

Return	Method	Summary
static long	doubleToLongBits(double value)	Returns a representation of the specified floating-point value according to the IEEE 754 floating-point "double format" bit layout.
static long	doubleToRawLongBits(double value)	Returns a representation of the specified floating-point value according to the IEEE 754 floating-point "double format" bit layout, preserving Not-a-Number (NaN) values.
static double	longBitsToDouble(long bits)	Returns the double value corresponding to a given bit representation.