moduleceylon.language1.2.0
ceylon.language
classEntry<out Key, out Item>
extends Object
given Key satisfies Object
OverviewPackageInitializerAttributesMethods
Collections

A pair containing a key and an associated value called the item. Used primarily to represent the elements of a Map. The type Entry<Key,Item> may be abbreviated Key->Item. An instance of Entry may be constructed using the -> operator:

String->Person entry = person.name->person;
By: Gavin

no subtypes hierarchy

Initializer
Entry(Key key, Item item)
Parameters:
  • key

    The key used to access the entry.

  • item

    The item associated with the key.

Attributes
coalescedshared <Key->Item&Object>? coalesced

An Entry with the key and item of this entry if this entry's item is non-null, or null otherwise.

hashshared actual Integer hash

The hash value of the value, which allows the value to be an element of a hash-based set or key of a hash-based map. Implementations must respect the constraint that:

  • if x==y then x.hash==y.hash.

Therefore, a class which refines Object.equals() must also refine hash.

Because the Integer type is platform-dependent a compiler for a given platform is permitted to further manipulate the calculated hash for an object, and the resulting hash may differ between platforms.

Refines Object.hash
itemshared Item item

The item associated with the key.

keyshared Key key

The key used to access the entry.

pairshared [Key, Item] pair

A pair (2 element tuple) with the key and item of this entry. For any entry:

entry.pair == [entry.key,entry.item]
stringshared actual String string

A description of the entry in the form key->item. If item is null, its string representation is the string "<null>".

Refines Object.string
Inherited Attributes
Attributes inherited from: Object
hash, string
Methods
equalsshared actual Boolean equals(Object that)

Determines if this entry is equal to the given entry. Two entries are equal if they have the same key and the same item.

  • The keys are considered the same if they are equal, in the sense of value equality.
  • Two items are considered the same if they are both null or if neither is null and they are equal.
Refines Object.equals
Inherited Methods
Methods inherited from: Object
equals()