Float

The largest positive value of type float.

The smallest positive value of type float.

The negative infinity of type float.

The Not-a-Number (NaN) value of type float.

The positive infinity of type float.

Constructs a newly allocated Float object that represents the primitive float argument.

Constructs a newly allocated Float object that represents the argument converted to type float.

Returns the value of this Float as a byte (by casting to a byte).

Returns the double value of this Float object.

Compares this object against some other object. The result is true if and only if the argument is not null and is a Float object that represents a float that has the identical bit pattern to the bit pattern of the float represented by this object. For this purpose, two float values are considered to be the same if and only if the method floatToIntBits(float) returns the same int value when applied to each. Note that in most cases, for two instances of class Float, f1 and f2, the value of f1.equals(f2) is true if and only if f1.floatValue() == f2.floatValue() also has the value true. However, there are two exceptions: If f1 and f2 both represent Float.NaN, then the equals method returns true, even though Float.NaN==Float.NaN has the value false. If f1 represents +0.0f while f2 represents -0.0f, or vice versa, the equal test has the value false, even though 0.0f==-0.0f has the value true. This definition allows hashtables to operate properly.

Returns the bit representation of a single-float value. The result is a representation of the floating-point argument according to the IEEE 754 floating-point "single precision" bit layout. Bit 31 (the bit that is selected by the mask 0x80000000) represents the sign of the floating-point number. Bits 30-23 (the bits that are selected by the mask 0x7f800000) represent the exponent. Bits 22-0 (the bits that are selected by the mask 0x007fffff) represent the significand (sometimes called the mantissa) of the floating-point number. If the argument is positive infinity, the result is 0x7f800000. If the argument is negative infinity, the result is 0xff800000. If the argument is NaN, the result is 0x7fc00000. In all cases, the result is an integer that, when given to the intBitsToFloat(int) method, will produce a floating-point value equal to the argument to floatToIntBits.

Returns the float value of this Float object.

Returns a hashcode for this Float object. The result is the integer bit representation, exactly as produced by the method floatToIntBits(float), of the primitive float value represented by this Float object.

Returns the single-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 "single precision" bit layout. If the argument is 0x7f800000, the result is positive infinity. If the argument is 0xff800000, the result is negative infinity. If the argument is any value in the range 0x7f800001 through 0x7fffffff or in the range 0xff800001 through 0xffffffff, the result is NaN. All IEEE 754 NaN values of type float are, in effect, lumped together by the Java programming language into a single float value called NaN. In all other cases, let s, e, and m be three values that can be computed from the argument: int s = ((bits >> 31) == 0) ? 1 : -1; int e = ((bits >> 23) & 0xff); int m = (e == 0) ? (bits & 0x7fffff) << 1 : (bits & 0x7fffff) | 0x800000; Then the floating-point result equals the value of the mathematical expression s·m·2e-150.

Returns the integer value of this Float (by casting to an int).

Returns true if this Float value is infinitely large in magnitude.

Returns true if the specified number is infinitely large in magnitude.

Returns true if the specified number is the special Not-a-Number (NaN) value.

Returns true if this Float value is Not-a-Number (NaN).

Returns the long value of this Float (by casting to a long).

Returns a new float initialized to the value represented by the specified String.

Returns the value of this Float as a short (by casting to a short).

Returns a String representation for the specified float value. The argument is converted to a readable string format as follows. All characters and characters in strings mentioned below are ASCII characters.

• If the argument is NaN, the result is the string "NaN".
• Otherwise, the result is a string that represents the sign and magnitude (absolute value) of the argument. If the sign is negative, the first character of the result is '-' ('-'); if the sign is positive, no sign character appears in the result. As for the magnitude m:
  • If m is infinity, it is represented by the characters "Infinity"; thus, positive infinity produces the result "Infinity" and negative infinity produces the result "-Infinity".
  • If m is zero, it is represented by the characters "0.0"; thus, negative zero produces the result "-0.0" and positive zero produces the result "0.0".
  • If m is greater than or equal to 10^-3 but less than 10⁷, then it is represented as the integer part of m, in decimal form with no leading zeroes, followed by '.' (.), followed by one or more decimal digits representing the fractional part of m.
  • If m is less than 10^-3 or not less than 10⁷, then it is represented in so-called "computerized scientific notation." Let n be the unique integer such that 10ⁿ<=m<1; then let a be the mathematically exact quotient of m and 10ⁿ so that 1<a<10. The magnitude is then represented as the integer part of a, as a single decimal digit, followed by '.' (.), followed by decimal digits representing the fractional part of a, followed by the letter 'E' (E), followed by a representation of n as a decimal integer, as produced by the method Integer.toString(int) of one argument.
  How many digits must be printed for the fractional part of m or a? There must be at least one digit to represent the fractional part, and beyond that as many, but only as many, more digits as are needed to uniquely distinguish the argument value from adjacent values of type float. That is, suppose that x is the exact mathematical value represented by the decimal representation produced by this method for a finite nonzero argument f. Then f must be the float value nearest to x; or, if two float values are equally close to xthen f must be one of them and the least significant bit of the significant of f must be 0. *

Returns the floating point value represented by the specified String.

The string s is interpreted as the representation of a floating-point value and a Float object representing that value is created and returned. If s is null, then a NullPointerException is thrown.

Leading and trailing whitespace characters in s are ignored. The rest of s should constitute a FloatValue as described by the lexical syntax rules:

 
 FloatValue: 
 	Signopt FloatingPointLiteral
 
 

where Sign, FloatingPointLiteral are as defined in Section 3.10.2 of the Java Language Specification. If it does not have the form of a FloatValue, then a NumberFormatException is thrown. Otherwise, it is regarded as representing an exact decimal value in the usual "computerized scientific notation"; this exact decimal value is then conceptually converted to an "infinitely precise" binary value that is then rounded to type float by the usual round-to-nearest rule of IEEE 754 floating-point arithmetic.