Package myAdapter

Class MapEntryAdapter

java.lang.Object
myAdapter.MapEntryAdapter
All Implemented Interfaces:
HMap.HEntry
public class MapEntryAdapter extends Object implements HMap.HEntry
A map entry (key-value pair). The Map.entrySet method returns a collection-view of the map, whose elements are of this class. The only way to obtain a reference to a map entry is from the iterator of this collection-view. These Map.Entry objects are valid only for the duration of the iteration; more formally, the behavior of a map entry is undefined if the backing map has been modified after the entry was returned by the iterator, except through the iterator's own remove operation, or through the setValue operation on a map entry returned by the iterator.
See Also:

  • Constructor Details

    • MapEntryAdapter

      public MapEntryAdapter(Object akey)
      Constructor with only key and value is default null
      Parameters:
      akey -

    • MapEntryAdapter

      public MapEntryAdapter(Object akey, Object avalue)
      Constructor with key and value argument
      Parameters:
      akey - - key to be assigned to the entry
      avalue - - value to be assigned to the entry

  • Method Details

    • getValue

      public Object getValue()
      Returns the value corresponding to this entry. If the mapping has been removed from the backing map (by the iterator's remove operation), the results of this call are undefined.
      Specified by:
      getValue in interface HMap.HEntry
      Returns:
      the value corresponding to this entry

    • getKey

      public Object getKey()
      Returns the key corresponding to this entry.
      Specified by:
      getKey in interface HMap.HEntry
      Returns:
      the key corresponding to this entry

    • setValue

      public Object setValue(Object value)
      Replaces the value corresponding to this entry with the specified value (optional operation). (Writes through to the map.) The behavior of this call is undefined if the mapping has already been removed from the map (by the iterator's remove operation).
      Specified by:
      setValue in interface HMap.HEntry
      Parameters:
      value - new value to be stored in this entry
      Returns:
      old value corresponding to the entry

    • equals

      public boolean equals(Object o)
      Compares the specified object with this entry for equality. Returns true if the given object is also a map entry and the two entries represent the same mapping. More formally, two entries e1 and e2 represent the same mapping if
           (e1.getKey()==null ?
      e2.getKey()==null : e1.getKey().equals(e2.getKey()))  &&
     (e1.getValue()==null ?
      e2.getValue()==null : e1.getValue().equals(e2.getValue()))
      This ensures that the equals method works properly across different implementations of the Map.Entry interface.
      Specified by:
      equals in interface HMap.HEntry
      Overrides:
      equals in class Object
      Parameters:
      o - object to be compared for equality with this map entry
      Returns:
      true if the specified object is equal to this map entry

    • hashCode

      public int hashCode()
      Returns the hash code value for this map entry. The hash code of a map entry e is defined to be: 
           (e.getKey()==null   ? 0 : e.getKey().hashCode()) ^
     (e.getValue()==null ? 0 : e.getValue().hashCode())
      This ensures that e1.equals(e2) implies that e1.hashCode()==e2.hashCode() for any two Entries e1 and e2, as required by the general contract of Object.hashCode.
      Specified by:
      hashCode in interface HMap.HEntry
      Overrides:
      hashCode in class Object
      Returns:
      the hash code value for this map entry
      See Also:

    • toString

      public String toString()
      Returns a string representation of the object.
      Overrides:
      toString in class Object
      Returns:
      a string representation of the object.