Class ModifiableInteger

  • All Implemented Interfaces:
    Serializable, Comparable<ModifiableInteger>

    public class ModifiableInteger
    extends Number
    implements Comparable<ModifiableInteger>
    The ModifiableInteger class wraps a value of the primitive type int in an object, similarly to Integer. An object of type ModifiableInteger contains a single field whose type is int.

    Unlike java.lang.Integer, the int value which the ModifiableInteger represents can be modified. It becomes useful when used together with the collection framework. For example, if you want to have a List of counters. You could use Integer but that would have became wasteful and inefficient if you frequently had to update the counters.

    WARNING: Because instances of this class are mutable, great care must be exercised if used as keys of a Map or as values in a Set in a manner that affects equals comparisons while the instances are keys in the map (or values in the set). For more see documentation of Map and Set.

    Barak Naveh
    See Also:
    Serialized Form
    • Field Detail

      • value

        public int value
        The int value represented by this ModifiableInteger.
    • Constructor Detail

      • ModifiableInteger

        public ModifiableInteger()
        not really deprecated, just marked so to avoid mistaken use.
        !!! DON'T USE - Use the ModifiableInteger(int) constructor instead !!!

        This constructor is for the use of java.beans.XMLDecoder deserialization. The constructor is marked as 'deprecated' to indicate to the programmer against using it by mistake.

      • ModifiableInteger

        public ModifiableInteger​(int value)
        Constructs a newly allocated ModifiableInteger object that represents the specified int value.
        value - the value to be represented by the ModifiableInteger object.
    • Method Detail

      • setValue

        public void setValue​(int value)
        Sets a new value for this modifiable integer.
        value - the new value to set.
      • getValue

        public int getValue()
        Returns the value of this object, similarly to intValue(). This getter is NOT redundant. It is used for serialization by java.beans.XMLEncoder.
        the value.
      • increment

        public void increment()
        Adds one to the value of this modifiable integer.
      • decrement

        public void decrement()
        Subtracts one from the value of this modifiable integer.
      • compareTo

        public int compareTo​(ModifiableInteger anotherInteger)
        Compares two ModifiableInteger objects numerically.
        Specified by:
        compareTo in interface Comparable<ModifiableInteger>
        anotherInteger - the ModifiableInteger to be compared.
        the value 0 if this ModifiableInteger is equal to the argument ModifiableInteger; a value less than 0 if this ModifiableInteger is numerically less than the argument ModifiableInteger; and a value greater than 0 if this ModifiableInteger is numerically greater than the argument ModifiableInteger (signed comparison).
      • equals

        public boolean equals​(Object o)
        Compares this object to the specified object. The result is true if and only if the argument is not null and is an ModifiableInteger object that contains the same int value as this object.
        equals in class Object
        o - the object to compare with.
        true if the objects are the same; false otherwise.
      • hashCode

        public int hashCode()
        Returns a hash code for this ModifiableInteger.
        hashCode in class Object
        a hash code value for this object, equal to the primitive int value represented by this ModifiableInteger object.
      • toInteger

        public Integer toInteger()
        Returns an Integer object representing this ModifiableInteger's value.
        an Integer representation of the value of this object.
      • toString

        public String toString()
        Returns a String object representing this ModifiableInteger's value. The value is converted to signed decimal representation and returned as a string, exactly as if the integer value were given as an argument to the Integer.toString(int) method.
        toString in class Object
        a string representation of the value of this object in base 10.