Package org.apache.commons.lang.mutable

Class MutableDouble

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable, Mutable
    public class MutableDouble
extends java.lang.Number
implements java.lang.Comparable, Mutable
    A mutable double wrapper.
    Since:
    2.1
    See Also:
    Double, Serialized Form

    • Constructor Summary

      Constructors 
      Constructor Description
      MutableDouble()
      Constructs a new MutableDouble with the default value of zero.
      MutableDouble​(double value)
      Constructs a new MutableDouble with the specified value.
      MutableDouble​(java.lang.Number value)
      Constructs a new MutableDouble with the specified value.
      MutableDouble​(java.lang.String value)
      Constructs a new MutableDouble parsing the given string.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void add​(double operand)
      Adds a value to the value of this instance.
      void add​(java.lang.Number operand)
      Adds a value to the value of this instance.
      int compareTo​(java.lang.Object obj)
      Compares this mutable to another in ascending order.
      void decrement()
      Decrements the value.
      double doubleValue()
      Returns the value of this MutableDouble as a double.
      boolean equals​(java.lang.Object obj)
      Compares this object against the specified object.
      float floatValue()
      Returns the value of this MutableDouble as a float.
      java.lang.Object getValue()
      Gets the value as a Double instance.
      int hashCode()
      Returns a suitable hash code for this mutable.
      void increment()
      Increments the value.
      int intValue()
      Returns the value of this MutableDouble as an int.
      boolean isInfinite()
      Checks whether the double value is infinite.
      boolean isNaN()
      Checks whether the double value is the special NaN value.
      long longValue()
      Returns the value of this MutableDouble as a long.
      void setValue​(double value)
      Sets the value.
      void setValue​(java.lang.Object value)
      Sets the value from any Number instance.
      void subtract​(double operand)
      Subtracts a value from the value of this instance.
      void subtract​(java.lang.Number operand)
      Subtracts a value from the value of this instance.
      java.lang.Double toDouble()
      Gets this mutable as an instance of Double.
      java.lang.String toString()
      Returns the String value of this mutable.

      • Methods inherited from class java.lang.Number

        byteValue, shortValue

      • Methods inherited from class java.lang.Object

        getClass, notify, notifyAll, wait, wait, wait

    • Constructor Detail

      • MutableDouble

        public MutableDouble()
        Constructs a new MutableDouble with the default value of zero.

      • MutableDouble

        public MutableDouble​(double value)
        Constructs a new MutableDouble with the specified value.
        Parameters:
        value - the initial value to store

      • MutableDouble

        public MutableDouble​(java.lang.Number value)
        Constructs a new MutableDouble with the specified value.
        Parameters:
        value - the initial value to store, not null
        Throws:
        java.lang.NullPointerException - if the object is null

      • MutableDouble

        public MutableDouble​(java.lang.String value)
              throws java.lang.NumberFormatException
        Constructs a new MutableDouble parsing the given string.
        Parameters:
        value - the string to parse, not null
        Throws:
        java.lang.NumberFormatException - if the string cannot be parsed into a double
        Since:
        2.5

    • Method Detail

      • getValue

        public java.lang.Object getValue()
        Gets the value as a Double instance.
        Specified by:
        getValue in interface Mutable
        Returns:
        the value as a Double, never null

      • setValue

        public void setValue​(double value)
        Sets the value.
        Parameters:
        value - the value to set

      • setValue

        public void setValue​(java.lang.Object value)
        Sets the value from any Number instance.
        Specified by:
        setValue in interface Mutable
        Parameters:
        value - the value to set, not null
        Throws:
        java.lang.NullPointerException - if the object is null
        java.lang.ClassCastException - if the type is not a Number

      • isNaN

        public boolean isNaN()
        Checks whether the double value is the special NaN value.
        Returns:
        true if NaN

      • isInfinite

        public boolean isInfinite()
        Checks whether the double value is infinite.
        Returns:
        true if infinite

      • increment

        public void increment()
        Increments the value.
        Since:
        Commons Lang 2.2

      • decrement

        public void decrement()
        Decrements the value.
        Since:
        Commons Lang 2.2

      • add

        public void add​(double operand)
        Adds a value to the value of this instance.
        Parameters:
        operand - the value to add
        Since:
        Commons Lang 2.2

      • add

        public void add​(java.lang.Number operand)
        Adds a value to the value of this instance.
        Parameters:
        operand - the value to add, not null
        Throws:
        java.lang.NullPointerException - if the object is null
        Since:
        Commons Lang 2.2

      • subtract

        public void subtract​(double operand)
        Subtracts a value from the value of this instance.
        Parameters:
        operand - the value to subtract, not null
        Since:
        Commons Lang 2.2

      • subtract

        public void subtract​(java.lang.Number operand)
        Subtracts a value from the value of this instance.
        Parameters:
        operand - the value to subtract, not null
        Throws:
        java.lang.NullPointerException - if the object is null
        Since:
        Commons Lang 2.2

      • intValue

        public int intValue()
        Returns the value of this MutableDouble as an int.
        Specified by:
        intValue in class java.lang.Number
        Returns:
        the numeric value represented by this object after conversion to type int.

      • longValue

        public long longValue()
        Returns the value of this MutableDouble as a long.
        Specified by:
        longValue in class java.lang.Number
        Returns:
        the numeric value represented by this object after conversion to type long.

      • floatValue

        public float floatValue()
        Returns the value of this MutableDouble as a float.
        Specified by:
        floatValue in class java.lang.Number
        Returns:
        the numeric value represented by this object after conversion to type float.

      • doubleValue

        public double doubleValue()
        Returns the value of this MutableDouble as a double.
        Specified by:
        doubleValue in class java.lang.Number
        Returns:
        the numeric value represented by this object after conversion to type double.

      • toDouble

        public java.lang.Double toDouble()
        Gets this mutable as an instance of Double.
        Returns:
        a Double instance containing the value from this mutable, never null

      • equals

        public boolean equals​(java.lang.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 Double object that represents a double that has the identical bit pattern to the bit pattern of the double represented by this object. For this purpose, two double values are considered to be the same if and only if the method Double.doubleToLongBits(double)returns the same long value when applied to each.

        Note that in most cases, for two instances of class Double,d1 and d2, the value of d1.equals(d2) is true if and only if 

           d1.doubleValue() == d2.doubleValue()

        also has the value true. However, there are two exceptions:

        • If d1 and d2 both represent Double.NaN, then the equals method returns true, even though Double.NaN==Double.NaN has the value false.
        • If d1 represents +0.0 while d2 represents -0.0, or vice versa, the equal test has the value false, even though +0.0==-0.0 has the value true. This allows hashtables to operate properly.
        Overrides:
        equals in class java.lang.Object
        Parameters:
        obj - the object to compare with, null returns false
        Returns:
        true if the objects are the same; false otherwise.

      • hashCode

        public int hashCode()
        Returns a suitable hash code for this mutable.
        Overrides:
        hashCode in class java.lang.Object
        Returns:
        a suitable hash code

      • compareTo

        public int compareTo​(java.lang.Object obj)
        Compares this mutable to another in ascending order.
        Specified by:
        compareTo in interface java.lang.Comparable
        Parameters:
        obj - the other mutable to compare to, not null
        Returns:
        negative if this is less, zero if equal, positive if greater
        Throws:
        java.lang.ClassCastException - if the argument is not a MutableDouble

      • toString

        public java.lang.String toString()
        Returns the String value of this mutable.
        Overrides:
        toString in class java.lang.Object
        Returns:
        the mutable value as a string