Float

java.lang.Object
- java.lang.Number
- - java.lang.Float

所有已实现的接口:

Serializable, Comparable<Float>
```
public final class Float
extends Number
implements Comparable<Float>
```
The Float class wraps a value of primitive type float in an object. An object of type Float contains a single field whose type is float.
In addition, this class provides several methods for converting a float to a String and a String to a float, as well as other constants and methods useful when dealing with a float.

从以下版本开始:

JDK1.0

另请参阅:

序列化表格

字段概要

字段
限定符和类型	字段	说明
`static int`	`BYTES`	The number of bytes used to represent a `float` value.
`static int`	`MAX_EXPONENT`	Maximum exponent a finite `float` variable may have.
`static float`	`MAX_VALUE`	A constant holding the largest positive finite value of type `float`, (2-2^-23)·2¹²⁷.
`static int`	`MIN_EXPONENT`	Minimum exponent a normalized `float` variable may have.
`static float`	`MIN_NORMAL`	A constant holding the smallest positive normal value of type `float`, 2^-126.
`static float`	`MIN_VALUE`	A constant holding the smallest positive nonzero value of type `float`, 2^-149.
`static float`	`NaN`	A constant holding a Not-a-Number (NaN) value of type `float`.
`static float`	`NEGATIVE_INFINITY`	A constant holding the negative infinity of type `float`.
`static float`	`POSITIVE_INFINITY`	A constant holding the positive infinity of type `float`.
`static int`	`SIZE`	The number of bits used to represent a `float` value.
`static Class<Float>`	`TYPE`	The `Class` instance representing the primitive type `float`.

构造器概要

构造器
构造器	说明
`Float(double value)`	Constructs a newly allocated `Float` object that represents the argument converted to type `float`.
`Float(float value)`	Constructs a newly allocated `Float` object that represents the primitive `float` argument.
`Float(String s)`	Constructs a newly allocated `Float` object that represents the floating-point value of type `float` represented by the string.

方法概要

所有方法静态方法实例方法具体方法
限定符和类型	方法	说明
`byte`	`byteValue()`	Returns the value of this `Float` as a `byte` after a narrowing primitive conversion.
`static int`	`compare(float f1, float f2)`	Compares the two specified `float` values.
`int`	`compareTo(Float anotherFloat)`	Compares two `Float` objects numerically.
`double`	`doubleValue()`	Returns the value of this `Float` as a `double` after a widening primitive conversion.
`boolean`	`equals(Object obj)`	Compares this object against the specified object.
`static int`	`floatToIntBits(float value)`	Returns a representation of the specified floating-point value according to the IEEE 754 floating-point "single format" bit layout.
`static int`	`floatToRawIntBits(float value)`	Returns a representation of the specified floating-point value according to the IEEE 754 floating-point "single format" bit layout, preserving Not-a-Number (NaN) values.
`float`	`floatValue()`	Returns the `float` value of this `Float` object.
`int`	`hashCode()`	Returns a hash code for this `Float` object.
`static int`	`hashCode(float value)`	Returns a hash code for a `float` value; compatible with `Float.hashCode()`.
`static float`	`intBitsToFloat(int bits)`	Returns the `float` value corresponding to a given bit representation.
`int`	`intValue()`	Returns the value of this `Float` as an `int` after a narrowing primitive conversion.
`static boolean`	`isFinite(float f)`	Returns `true` if the argument is a finite floating-point value; returns `false` otherwise (for NaN and infinity arguments).
`boolean`	`isInfinite()`	Returns `true` if this `Float` value is infinitely large in magnitude, `false` otherwise.
`static boolean`	`isInfinite(float v)`	Returns `true` if the specified number is infinitely large in magnitude, `false` otherwise.
`boolean`	`isNaN()`	Returns `true` if this `Float` value is a Not-a-Number (NaN), `false` otherwise.
`static boolean`	`isNaN(float v)`	Returns `true` if the specified number is a Not-a-Number (NaN) value, `false` otherwise.
`long`	`longValue()`	Returns value of this `Float` as a `long` after a narrowing primitive conversion.
`static float`	`max(float a, float b)`	Returns the greater of two `float` values as if by calling `Math#max(float, float)`.
`static float`	`min(float a, float b)`	Returns the smaller of two `float` values as if by calling `Math#min(float, float)`.
`static float`	`parseFloat(String s)`	Returns a new `float` initialized to the value represented by the specified `String`, as performed by the `valueOf` method of class `Float`.
`short`	`shortValue()`	Returns the value of this `Float` as a `short` after a narrowing primitive conversion.
`static float`	`sum(float a, float b)`	Adds two `float` values together as per the + operator.
`static String`	`toHexString(float f)`	Returns a hexadecimal string representation of the `float` argument.
`String`	`toString()`	Returns a string representation of this `Float` object.
`static String`	`toString(float f)`	Returns a string representation of the `float` argument.
`static Float`	`valueOf(float f)`	Returns a `Float` instance representing the specified `float` value.
`static Float`	`valueOf(String s)`	Returns a `Float` object holding the `float` value represented by the argument string `s`.

从类继承的方法 java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

字段详细资料
- BYTES
```
public static final int BYTES
```
  The number of bytes used to represent a float value.
  
  从以下版本开始:
  
  1.8
  
  另请参阅:
  
  常量字段值
- MAX_EXPONENT
```
public static final int MAX_EXPONENT
```
  Maximum exponent a finite float variable may have. It is equal to the value returned by Math.getExponent(Float.MAX_VALUE).
  
  从以下版本开始:
  
  1.6
  
  另请参阅:
  
  常量字段值
- MAX_VALUE
```
public static final float MAX_VALUE
```
  A constant holding the largest positive finite value of type float, (2-2^-23)·2¹²⁷. It is equal to the hexadecimal floating-point literal 0x1.fffffeP+127f and also equal to Float.intBitsToFloat(0x7f7fffff).
  
  另请参阅:
  
  常量字段值
- MIN_EXPONENT
```
public static final int MIN_EXPONENT
```
  Minimum exponent a normalized float variable may have. It is equal to the value returned by Math.getExponent(Float.MIN_NORMAL).
  
  从以下版本开始:
  
  1.6
  
  另请参阅:
  
  常量字段值
- MIN_NORMAL
```
public static final float MIN_NORMAL
```
  A constant holding the smallest positive normal value of type float, 2^-126. It is equal to the hexadecimal floating-point literal 0x1.0p-126f and also equal to Float.intBitsToFloat(0x00800000).
  
  从以下版本开始:
  
  1.6
  
  另请参阅:
  
  常量字段值
- MIN_VALUE
```
public static final float MIN_VALUE
```
  A constant holding the smallest positive nonzero value of type float, 2^-149. It is equal to the hexadecimal floating-point literal 0x0.000002P-126f and also equal to Float.intBitsToFloat(0x1).
  
  另请参阅:
  
  常量字段值
- NEGATIVE_INFINITY
```
public static final float NEGATIVE_INFINITY
```
  A constant holding the negative infinity of type float. It is equal to the value returned by Float.intBitsToFloat(0xff800000).
  
  另请参阅:
  
  常量字段值
- NaN
```
public static final float NaN
```
  A constant holding a Not-a-Number (NaN) value of type float. It is equivalent to the value returned by Float.intBitsToFloat(0x7fc00000).
  
  另请参阅:
  
  常量字段值
- POSITIVE_INFINITY
```
public static final float POSITIVE_INFINITY
```
  A constant holding the positive infinity of type float. It is equal to the value returned by Float.intBitsToFloat(0x7f800000).
  
  另请参阅:
  
  常量字段值
- SIZE
```
public static final int SIZE
```
  The number of bits used to represent a float value.
  
  从以下版本开始:
  
  1.5
  
  另请参阅:
  
  常量字段值
- TYPE
```
public static final Class<Float> TYPE
```
  The Class instance representing the primitive type float.
  
  从以下版本开始:
  
  JDK1.1

构造器详细资料
- Float
```
public Float(float value)
```
  Constructs a newly allocated Float object that represents the primitive float argument.
  
  参数:
  
  value - the value to be represented by the Float.
- Float
```
public Float(double value)
```
  Constructs a newly allocated Float object that represents the argument converted to type float.
  
  参数:
  
  value - the value to be represented by the Float.
- Float
```
public Float(String s)
      throws NumberFormatException
```
  Constructs a newly allocated Float object that represents the floating-point value of type float represented by the string. The string is converted to a float value as if by the valueOf method.
  
  参数:
  
  s - a string to be converted to a Float.
  
  抛出:
  
  NumberFormatException - if the string does not contain a parsable number.
  
  另请参阅:
  
  valueOf(java.lang.String)

方法详细资料

toString
```
public static String toString(float f)
```
Returns a string representation of the float argument. All characters 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 '-' ('\u002D'); 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 '.' ('\u002E'), followed by one or more decimal digits representing the fractional part of m.
  - If m is less than 10^-3 or greater than or equal to 10⁷, then it is represented in so-called "computerized scientific notation." Let n be the unique integer such that 10ⁿ≤ m < 10ⁿ⁺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 '.' ('\u002E'), followed by decimal digits representing the fractional part of a, followed by the letter 'E' ('\u0045'), followed by a representation of n as a decimal integer, as produced by the method Integer.toString(int).
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 x, then f must be one of them and the least significant bit of the significand of f must be 0.
To create localized string representations of a floating-point value, use subclasses of NumberFormat.
参数:

f - the float to be converted.

返回:

a string representation of the argument.

toHexString

public static String toHexString(float f)

Returns a hexadecimal string representation of the float argument. All characters 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 '-' ('\u002D'); 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 string "Infinity"; thus, positive infinity produces the result "Infinity" and negative infinity produces the result "-Infinity".
- If m is zero, it is represented by the string "0x0.0p0"; thus, negative zero produces the result "-0x0.0p0" and positive zero produces the result "0x0.0p0".
- If m is a float value with a normalized representation, substrings are used to represent the significand and exponent fields. The significand is represented by the characters "0x1." followed by a lowercase hexadecimal representation of the rest of the significand as a fraction. Trailing zeros in the hexadecimal representation are removed unless all the digits are zero, in which case a single zero is used. Next, the exponent is represented by "p" followed by a decimal string of the unbiased exponent as if produced by a call to Integer#toString(int) on the exponent value.
- If m is a float value with a subnormal representation, the significand is represented by the characters "0x0." followed by a hexadecimal representation of the rest of the significand as a fraction. Trailing zeros in the hexadecimal representation are removed. Next, the exponent is represented by "p-126". Note that there must be at least one nonzero digit in a subnormal significand.

Examples
Floating-point Value	Hexadecimal String
`1.0`	`0x1.0p0`
`-1.0`	`-0x1.0p0`
`2.0`	`0x1.0p1`
`3.0`	`0x1.8p1`
`0.5`	`0x1.0p-1`
`0.25`	`0x1.0p-2`
`Float.MAX_VALUE`	`0x1.fffffep127`
`Minimum Normal Value`	`0x1.0p-126`
`Maximum Subnormal Value`	`0x0.fffffep-126`
`Float.MIN_VALUE`	`0x0.000002p-126`

参数:: f - the float to be converted.
返回:: a hex string representation of the argument.
从以下版本开始:: 1.5

valueOf
```
public static Float valueOf(String s)
                     throws NumberFormatException
```
Returns a Float object holding the float value represented by the argument string s.
If s is null, then a NullPointerException is thrown.
Leading and trailing whitespace characters in s are ignored. Whitespace is removed as if by the String#trim method; that is, both ASCII space and control characters are removed. The rest of s should constitute a FloatValue as described by the lexical syntax rules:

FloatValue:
Sign_opt NaN
Sign_opt Infinity
Sign_opt FloatingPointLiteral
Sign_opt HexFloatingPointLiteral
SignedInteger

HexFloatingPointLiteral:
HexSignificand BinaryExponent FloatTypeSuffix_opt

HexSignificand:
HexNumeral
HexNumeral .
0x HexDigits_opt . HexDigits
0X HexDigits_opt . HexDigits

BinaryExponent:
BinaryExponentIndicator SignedInteger

BinaryExponentIndicator:
p
P

where Sign, FloatingPointLiteral, HexNumeral, HexDigits, SignedInteger and FloatTypeSuffix are as defined in the lexical structure sections of The Java™ Language Specification, except that underscores are not accepted between digits. If s does not have the form of a FloatValue, then a NumberFormatException is thrown. Otherwise, s is regarded as representing an exact decimal value in the usual "computerized scientific notation" or as an exact hexadecimal value; this exact numerical 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, which includes preserving the sign of a zero value. Note that the round-to-nearest rule also implies overflow and underflow behaviour; if the exact value of s is large enough in magnitude (greater than or equal to (MAX_VALUE + Math#ulp(float)/2), rounding to float will result in an infinity and if the exact value of s is small enough in magnitude (less than or equal to MIN_VALUE/2), rounding to float will result in a zero. Finally, after rounding a Float object representing this float value is returned.
To interpret localized string representations of a floating-point value, use subclasses of NumberFormat.
Note that trailing format specifiers, specifiers that determine the type of a floating-point literal (1.0f is a float value; 1.0d is a double value), do not influence the results of this method. In other words, the numerical value of the input string is converted directly to the target floating-point type. In general, the two-step sequence of conversions, string to double followed by double to float, is not equivalent to converting a string directly to float. For example, if first converted to an intermediate double and then to float, the string
"1.00000017881393421514957253748434595763683319091796875001d"
results in the float value 1.0000002f; if the string is converted directly to float, 1.0000001f results.
To avoid calling this method on an invalid string and having a NumberFormatException be thrown, the documentation for Double#valueOf lists a regular expression which can be used to screen the input.

参数:

s - the string to be parsed.

返回:

a Float object holding the value represented by the String argument.

抛出:

NumberFormatException - if the string does not contain a parsable number.

valueOf
```
public static Float valueOf(float f)
```
Returns a Float instance representing the specified float value. If a new Float instance is not required, this method should generally be used in preference to the constructor Float(float), as this method is likely to yield significantly better space and time performance by caching frequently requested values.

参数:

f - a float value.

返回:

a Float instance representing f.

从以下版本开始:

1.5

parseFloat
```
public static float parseFloat(String s)
                        throws NumberFormatException
```
Returns a new float initialized to the value represented by the specified String, as performed by the valueOf method of class Float.

参数:

s - the string to be parsed.

返回:

the float value represented by the string argument.

抛出:

NullPointerException - if the string is null

NumberFormatException - if the string does not contain a parsable float.

从以下版本开始:

1.2

另请参阅:

valueOf(String)

isNaN
```
public static boolean isNaN(float v)
```
Returns true if the specified number is a Not-a-Number (NaN) value, false otherwise.

参数:

v - the value to be tested.

返回:

true if the argument is NaN; false otherwise.

isInfinite
```
public static boolean isInfinite(float v)
```
Returns true if the specified number is infinitely large in magnitude, false otherwise.

参数:

v - the value to be tested.

返回:

true if the argument is positive infinity or negative infinity; false otherwise.

isFinite
```
public static boolean isFinite(float f)
```
Returns true if the argument is a finite floating-point value; returns false otherwise (for NaN and infinity arguments).

参数:

f - the float value to be tested

返回:

true if the argument is a finite floating-point value, false otherwise.

从以下版本开始:

1.8

isNaN
```
public boolean isNaN()
```
Returns true if this Float value is a Not-a-Number (NaN), false otherwise.

返回:

true if the value represented by this object is NaN; false otherwise.

isInfinite
```
public boolean isInfinite()
```
Returns true if this Float value is infinitely large in magnitude, false otherwise.

返回:

true if the value represented by this object is positive infinity or negative infinity; false otherwise.

toString
```
public String toString()
```
Returns a string representation of this Float object. The primitive float value represented by this object is converted to a String exactly as if by the method toString of one argument.

覆盖:

toString 在类中 Object

返回:

a String representation of this object.

另请参阅:

toString(float)

byteValue
```
public byte byteValue()
```
Returns the value of this Float as a byte after a narrowing primitive conversion.

覆盖:

byteValue 在类中 Number

返回:

the float value represented by this object converted to type byte

shortValue
```
public short shortValue()
```
Returns the value of this Float as a short after a narrowing primitive conversion.

覆盖:

shortValue 在类中 Number

返回:

the float value represented by this object converted to type short

从以下版本开始:

JDK1.1

intValue
```
public int intValue()
```
Returns the value of this Float as an int after a narrowing primitive conversion.

指定者:

intValue 在类中 Number

返回:

the float value represented by this object converted to type int

longValue
```
public long longValue()
```
Returns value of this Float as a long after a narrowing primitive conversion.

指定者:

longValue 在类中 Number

返回:

the float value represented by this object converted to type long

floatValue
```
public float floatValue()
```
Returns the float value of this Float object.

指定者:

floatValue 在类中 Number

返回:

the float value represented by this object

doubleValue
```
public double doubleValue()
```
Returns the value of this Float as a double after a widening primitive conversion.

指定者:

doubleValue 在类中 Number

返回:

the float value represented by this object converted to type double

hashCode
```
public int hashCode()
```
Returns a hash code 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.

覆盖:

hashCode 在类中 Object

返回:

a hash code value for this object.

另请参阅:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)

hashCode
```
public static int hashCode(float value)
```
Returns a hash code for a float value; compatible with Float.hashCode().

参数:

value - the value to hash

返回:

a hash code value for a float value.

从以下版本开始:

1.8

equals
```
public boolean equals(Object obj)
```
Compares this object against the specified object. The result is true if and only if the argument is not null and is a Float object that represents a float with the same value as 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 identical 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 hash tables to operate properly.
覆盖:

equals 在类中 Object

参数:

obj - the object to be compared

返回:

true if the objects are the same; false otherwise.

另请参阅:

floatToIntBits(float)

floatToIntBits
```
public static int floatToIntBits(float value)
```
Returns a representation of the specified floating-point value according to the IEEE 754 floating-point "single format" 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 the same as the argument to floatToIntBits (except all NaN values are collapsed to a single "canonical" NaN value).

参数:

value - a floating-point number.

返回:

the bits that represent the floating-point number.

floatToRawIntBits
```
public static int floatToRawIntBits(float value)
```
Returns a representation of the specified floating-point value according to the IEEE 754 floating-point "single format" bit layout, preserving Not-a-Number (NaN) values.
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 the integer representing the actual NaN value. Unlike the floatToIntBits method, floatToRawIntBits does not collapse all the bit patterns encoding a NaN to a single "canonical" NaN value.
In all cases, the result is an integer that, when given to the intBitsToFloat(int) method, will produce a floating-point value the same as the argument to floatToRawIntBits.

参数:

value - a floating-point number.

返回:

the bits that represent the floating-point number.

从以下版本开始:

1.3

intBitsToFloat
```
public static float intBitsToFloat(int bits)
```
Returns the float value 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 format" 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 a NaN. No IEEE 754 floating-point operation provided by Java can distinguish between two NaN values of the same type with different bit patterns. Distinct values of NaN are only distinguishable by use of the Float.floatToRawIntBits method.
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·2^e-150.
Note that this method may not be able to return a float NaN with exactly same bit pattern as the int argument. IEEE 754 distinguishes between two kinds of NaNs, quiet NaNs and signaling NaNs. The differences between the two kinds of NaN are generally not visible in Java. Arithmetic operations on signaling NaNs turn them into quiet NaNs with a different, but often similar, bit pattern. However, on some processors merely copying a signaling NaN also performs that conversion. In particular, copying a signaling NaN to return it to the calling method may perform this conversion. So intBitsToFloat may not be able to return a float with a signaling NaN bit pattern. Consequently, for some int values, floatToRawIntBits(intBitsToFloat(start)) may not equal start. Moreover, which particular bit patterns represent signaling NaNs is platform dependent; although all NaN bit patterns, quiet or signaling, must be in the NaN range identified above.
参数:

bits - an integer.

返回:

the float floating-point value with the same bit pattern.

compareTo
```
public int compareTo(Float anotherFloat)
```
Compares two Float objects numerically. There are two ways in which comparisons performed by this method differ from those performed by the Java language numerical comparison operators (<, <=, ==, >=, >) when applied to primitive float values:
- Float.NaN is considered by this method to be equal to itself and greater than all other float values (including Float.POSITIVE_INFINITY).
- 0.0f is considered by this method to be greater than -0.0f.
This ensures that the natural ordering of Float objects imposed by this method is consistent with equals.
指定者:

compareTo 在接口中 Comparable<Float>

参数:

anotherFloat - the Float to be compared.

返回:

the value 0 if anotherFloat is numerically equal to this Float; a value less than 0 if this Float is numerically less than anotherFloat; and a value greater than 0 if this Float is numerically greater than anotherFloat.

从以下版本开始:

1.2

另请参阅:

Comparable.compareTo(Object)

compare
```
public static int compare(float f1,
                          float f2)
```
Compares the two specified float values. The sign of the integer value returned is the same as that of the integer that would be returned by the call:
```
    new Float(f1).compareTo(new Float(f2))
 
```
参数:

f1 - the first float to compare.

f2 - the second float to compare.

返回:

the value 0 if f1 is numerically equal to f2; a value less than 0 if f1 is numerically less than f2; and a value greater than 0 if f1 is numerically greater than f2.

从以下版本开始:

1.4

sum
```
public static float sum(float a,
                        float b)
```
Adds two float values together as per the + operator.

参数:

a - the first operand

b - the second operand

返回:

the sum of a and b

从以下版本开始:

1.8

另请参阅:

BinaryOperator

max
```
public static float max(float a,
                        float b)
```
Returns the greater of two float values as if by calling Math#max(float, float).

参数:

a - the first operand

b - the second operand

返回:

the greater of a and b

从以下版本开始:

1.8

另请参阅:

BinaryOperator

min
```
public static float min(float a,
                        float b)
```
Returns the smaller of two float values as if by calling Math#min(float, float).

参数:

a - the first operand

b - the second operand

返回:

the smaller of a and b

从以下版本开始:

1.8

另请参阅:

BinaryOperator

类 Float

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

BYTES

MAX_EXPONENT

MAX_VALUE

MIN_EXPONENT

MIN_NORMAL

MIN_VALUE

NEGATIVE_INFINITY

NaN

POSITIVE_INFINITY

SIZE

TYPE

构造器详细资料

Float

Float

Float

方法详细资料

toString

toHexString

valueOf

valueOf

parseFloat

isNaN

isInfinite

isFinite

isNaN

isInfinite

toString

byteValue

shortValue

intValue

longValue

floatValue

doubleValue

hashCode

hashCode

equals

floatToIntBits

floatToRawIntBits

intBitsToFloat

compareTo

compare

sum

max

min