Double class

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.

Constants in Double class

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.

Double class Constructor

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

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

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.

If a double value is an infinite large value, or it is not a number.

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.

Convert string value to double

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.

Convert double value from string

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

Get the hexadecimal string representation

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

Bit oriented

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.

Double: