程序包 ohos.utils

类 RationalNumber

java.lang.Object

java.lang.Number

ohos.utils.RationalNumber

所有已实现的接口:

Serializable, Comparable<RationalNumber>

public final class RationalNumber
extends Number
implements Comparable<RationalNumber>

An immutable class representing a rational number.

从以下版本开始:

1

另请参阅:

序列化表格

构造器概要

构造器

构造器	说明
RationalNumber(int numerator, int denominator)	A constructor used to create a RationalNumber instance with a given numerator and denominator.

方法概要

限定符和类型	方法	说明
int	compareTo(RationalNumber another)	Compares the current RationalNumber object with a given object.
static RationalNumber	createRationalFromString(String rationalString)	Creates a RationalNumber object based on a given string.
double	doubleValue()	Obtains the value of the current RationalNumber object as a double-precision floating point number.
boolean	equals(Object obj)	Checks whether a given object is the same as the current RationalNumber object.
float	floatValue()	Obtains the value of the current RationalNumber object as a floating point number.
static int	getCommonDivisor(int number1, int number2)	Obtains the greatest common divisor of two specified numbers.
int	getDenominator()	Obtains the denominator of the current RationalNumber object.
int	getNumerator()	Obtains the numerator of the current RationalNumber object.
int	hashCode()	Obtains the hash code value of the current RationalNumber object.
int	intValue()	Obtains the value of the current RationalNumber object as an integer.
boolean	isFinite()	Checks whether the current RationalNumber object represents a finite value.
boolean	isInfinite()	Checks whether the current RationalNumber object represents an infinite value.
boolean	isNaN()	Checks whether the current RationalNumber object represents a Not-a-Number (NaN) value.
boolean	isZero()	Checks whether the current RationalNumber object represents the value 0.
long	longValue()	Obtains the value of the current RationalNumber object as a long integer.
String	toString()	Obtains a string representation of the current RationalNumber object.

从类继承的方法 java.lang.Number

byteValue, shortValue

从类继承的方法 java.lang.Object

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

构造器详细资料

RationalNumber

public RationalNumber(int numerator,
                      int denominator)

A constructor used to create a RationalNumber instance with a given numerator and denominator.

参数:

numerator - Indicates the numerator.

denominator - Indicates the denominator.

从以下版本开始:

1

方法详细资料

getCommonDivisor

public static int getCommonDivisor(int number1,
                                   int number2)

Obtains the greatest common divisor of two specified numbers.

参数:

number1 - Indicates the first number.

number2 - Indicates the second number.

返回:

Returns the greatest common divisor of the two given numbers.

抛出:

IllegalArgumentException - Throws this exception if the specified number1 or number2 is Integer#MIN_VALUE.

从以下版本开始:

1

equals

public boolean equals(Object obj)

Checks whether a given object is the same as the current RationalNumber object.

覆盖:

equals 在类中 Object

参数:

obj - Indicates the object to compare.

返回:

Returns true if the given object is the same as the current object; returns false otherwise.

从以下版本开始:

1

另请参阅:

Object.hashCode(), HashMap

hashCode

public int hashCode()

Obtains the hash code value of the current RationalNumber object.

覆盖:

hashCode 在类中 Object

返回:

Returns the hash code value of the current RationalNumber object.

从以下版本开始:

1

另请参阅:

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

toString

public String toString()

Obtains a string representation of the current RationalNumber object.

覆盖:

toString 在类中 Object

返回:

Returns a specific string based on the following rules:

• Returns NaN if the numerator and denominator of the current object are both 0;
• Returns PositiveInfinity if the denominator is 0 and the numerator is a positive number;
• Returns NegativeInfinity if the denominator is 0 and the numerator is a negative number;
• Returns a string in the format <i>Numerator</i>/<i>Denominator</i>, for example, 3/5, in other circumstances.

从以下版本开始:

1

doubleValue

public double doubleValue()

Obtains the value of the current RationalNumber object as a double-precision floating point number.

指定者:

doubleValue 在类中 Number

返回:

Returns the double-precision floating point number.

从以下版本开始:

1

floatValue

public float floatValue()

Obtains the value of the current RationalNumber object as a floating point number.

指定者:

floatValue 在类中 Number

返回:

Returns the floating point number.

从以下版本开始:

1

intValue

public int intValue()

Obtains the value of the current RationalNumber object as an integer.

指定者:

intValue 在类中 Number

返回:

Returns the integer..

从以下版本开始:

1

longValue

public long longValue()

Obtains the value of the current RationalNumber object as a long integer.

指定者:

longValue 在类中 Number

返回:

Returns the long integer.

从以下版本开始:

1

getDenominator

public int getDenominator()

Obtains the denominator of the current RationalNumber object.

返回:

Returns the denominator of the current object.

从以下版本开始:

1

getNumerator

public int getNumerator()

Obtains the numerator of the current RationalNumber object.

返回:

Returns the numerator of the current object.

从以下版本开始:

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isFinite

public boolean isFinite()

Checks whether the current RationalNumber object represents a finite value.

返回:

Returns true if the denominator is not 0; returns false otherwise.

从以下版本开始:

1

isInfinite

public boolean isInfinite()

Checks whether the current RationalNumber object represents an infinite value.

返回:

Returns true if the denominator is 0 and the numerator is not 0; returns false otherwise.

从以下版本开始:

1

isNaN

public boolean isNaN()

Checks whether the current RationalNumber object represents a Not-a-Number (NaN) value.

返回:

Returns true if the denominator and numerator are both 0; returns false otherwise.

从以下版本开始:

1

isZero

public boolean isZero()

Checks whether the current RationalNumber object represents the value 0.

返回:

Returns true if the value represented by the current object is 0; returns false otherwise.

从以下版本开始:

1

createRationalFromString

public static RationalNumber createRationalFromString(String rationalString)
                                               throws NumberFormatException

Creates a RationalNumber object based on a given string.

The given string must be in the format <i>Numerator</i>/<i>Denominator</i>, for example, 3/5. To create an object representing an NaN value, pass NaN to this method. To create an object representing a positive infinity value, pass PositiveInfinity. To create an object representing a negative infinity value, pass NegativeInfinity.

参数:

rationalString - Indicates the string used to create the RationalNumber object.

返回:

Returns the RationalNumber object generated based on the given string.

抛出:

NullPointerException - Throws this exception if the rationalString is null.

NumberFormatException - Throws this exception if the rationalString is illegal.

从以下版本开始:

1

compareTo

public int compareTo(RationalNumber another)

Compares the current RationalNumber object with a given object.

指定者:

compareTo 在接口中 Comparable<RationalNumber>

参数:

another - Indicates the object to compare.

返回:

Returns 0 if the two objects are equal; returns 1 if the given object is less than the current object; returns -1 if the given object is greater than the current object.

抛出:

NullPointerException - Throws this exception if the another is null.

从以下版本开始:

1