java.lang
Class Double

java.lang.Object
  java.lang.Number
      java.lang.Double

public final class Double
extends Number

Minimal Double implementation.

Author:

bb, Sven Köhler

Field Summary

static double	NaN
static double	NEGATIVE_INFINITY
static double	POSITIVE_INFINITY
static int	SIZE

Constructor Summary

Double(double val)

Double(String val)

Method Summary

byte	byteValue() Return the byte value of this Number.
static long	doubleToLongBits(double value) Returns the bit representation of a double-float value.
static long	doubleToRawLongBits(double d) Returns the bit representation of a double-float value.
double	doubleValue() Return the double value of this Number.
boolean	equals(Object o)
float	floatValue() Return the float value of this Number.
int	hashCode()
int	intValue() Return the int value of this Number.
boolean	isInfinite()
static boolean	isInfinite(double v)
boolean	isNaN()
static boolean	isNaN(double val)
static double	longBitsToDouble(long l) Returns the double-float corresponding to a given bit representation.
long	longValue() Return the long value of this Number.
static double	parseDouble(String s) Converts a String value into a double.
short	shortValue() Return the short value of this Number.
String	toString()
static String	toString(double d) Convert a double to a String
static Double	valueOf(double d)
static Double	valueOf(String s)

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

POSITIVE_INFINITY

public static final double POSITIVE_INFINITY

See Also:

Constant Field Values

NEGATIVE_INFINITY

public static final double NEGATIVE_INFINITY

See Also:

Constant Field Values

NaN

public static final double NaN

See Also:

Constant Field Values

SIZE

public static final int SIZE

See Also:

Constant Field Values

Constructor Detail

Double

public Double(double val)

Double

public Double(String val)

Method Detail

byteValue

public byte byteValue()

Description copied from class: Number

Return the byte value of this Number.

Overrides:

byteValue in class Number

Returns:

the byte value

doubleValue

public double doubleValue()

Description copied from class: Number

Return the double value of this Number.

Specified by:

doubleValue in class Number

Returns:

the double value

equals

public boolean equals(Object o)

Overrides:

equals in class Object

floatValue

public float floatValue()

Description copied from class: Number

Return the float value of this Number.

Specified by:

floatValue in class Number

Returns:

the float value

hashCode

public int hashCode()

Overrides:

hashCode in class Object

intValue

public int intValue()

Description copied from class: Number

Return the int value of this Number.

Specified by:

intValue in class Number

Returns:

the int value

isInfinite

public boolean isInfinite()

isInfinite

public static boolean isInfinite(double v)

isNaN

public boolean isNaN()

isNaN

public static boolean isNaN(double val)

longValue

public long longValue()

Description copied from class: Number

Return the long value of this Number.

Specified by:

longValue in class Number

Returns:

the long value

parseDouble

public static double parseDouble(String s)
                          throws NumberFormatException

Converts a String value into a double. Must only contain numbers and an optional decimal, and optional - sign at front.

Parameters:

s - String representation of the floating point number

Returns:

double precision floating point number

Throws:

NumberFormatException

shortValue

public short shortValue()

Description copied from class: Number

Return the short value of this Number.

Overrides:

shortValue in class Number

Returns:

the short value

toString

public String toString()

Overrides:

toString in class Object

toString

public static String toString(double d)

Convert a double to a String

Parameters:

d - the double to be converted

Returns:

the String representation of the float

valueOf

public static Double valueOf(double d)

valueOf

public static Double valueOf(String s)

doubleToRawLongBits

public static long doubleToRawLongBits(double d)

Returns the bit representation of a double-float value. The result is a representation of the floating-point argument according to the IEEE 754 floating-point "double precision" bit layout.

• If the argument is positive infinity, the result is 0x7ff0000000000000.
• If the argument is negative infinity, the result is 0xfff0000000000000.

  If the argument is NaN, the result is the integer representing the actual NaN value.

In all cases, the result is an integer that, when given to the longBitsToDouble(long) method, will produce a floating-point value equal to the argument to doubleToRawLongBits.

Parameters:

d - a floating-point number.

Returns:

the bits that represent the floating-point number.

doubleToLongBits

public static long doubleToLongBits(double value)

Returns the bit representation of a double-float value. The result is a representation of the floating-point argument according to the IEEE 754 floating-point "double precision" bit layout. Unlike doubleToRawLongBits this method does collapse all NaN values into a standard single value. This value is 0x7ff8000000000000.

Parameters:

value - a floating-point number.

Returns:

the bits that represent the floating-point number.

longBitsToDouble

public static double longBitsToDouble(long l)

Returns the double-float corresponding to a given bit representation. The argument is considered to be a representation of a floating-point value according to the IEEE 754 floating-point "double precision" bit layout.

If the argument is 0x7ff0000000000000, the result is positive infinity.

If the argument is 0xfff0000000000000, the result is negative infinity.

If the argument is any value in the range 0x7ff0000000000001L through 0x7fffffffffffffffL or in the range 0xfff0000000000001L through 0xffffffffffffffffL, the result is a NaN. All IEEE 754 NaN values of type float are, in effect, lumped together by the Java programming language into a single double value called NaN. Distinct values of NaN are only accessible by use of the Double.doubleToRawLongBits method.

Parameters:

l - a long.

Returns:

the double-format floating-point value with the same bit pattern.