A KeyValuePair in Java

Question

I m looking for a KeyValuePair class in Java  Since java util heavily uses interfaces there is no concrete implementation provided  only the Map Entry interface   Is there some canonical implementation I can import  It is one of those  plumbers programming  classes I hate to implement 100x times

User · Answer

You can create your custom KeyValuePair class easily   public class Key lt K  V gt        K key      V value       public Key                 public Key K key  V  value            this key   key          this value   value             public void setValue V value            this value   value            public V getValue             return value             public void setKey K key            this key   key            public K getKey             return key

User · Answer

Hashtable lt String  Object gt    It is better than java util Properties which is by fact an extension of Hashtable lt Object  Object gt

User · Answer

The class AbstractMap SimpleEntry is generic and can be useful

User · Answer

I ve published a NameValuePair class in GlobalMentor s core library  available in Maven  This is an ongoing project with a long history  so please submit any request for changes or improvements

User · Answer

The Pair class from Commons Lang might help   Pair lt String  String gt  keyValue   new ImmutablePair  key    value      Of course  you would need to include commons-lang

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Use of javafx util Pair is sufficient for most simple Key-Value pairings of any two types that can be instantiated   Pair lt Integer  String gt  myPair   new Pair lt  gt  7   Seven    Integer key   myPair getKey    String value   myPair getValue

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import java util Map   public class KeyValue lt K  V gt  implements Map Entry lt K  V gt        private K key      private V value       public KeyValue K key  V value                this key   key          this value   value             public K getKey                 return this key             public V getValue                 return this value             public K setKey K key                return this key   key             public V setValue V value                return this value   value

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Android programmers could use BasicNameValuePair  Update   BasicNameValuePair is now deprecated  API 22   Use Pair instead   Example usage   Pair lt Integer  String gt  simplePair   new Pair lt  gt  42   Second    Integer first   simplePair first     42 String second   simplePair second      Second

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I like to use  Properties  Example   Properties props   new Properties     props setProperty  displayName    Jim Wilson        key  value   String name   props getProperty  displayName         gt  Jim Wilson  String acctNum   props getProperty  accountNumber         gt  null  String nextPosition   props getProperty  position    1         gt  1   If you are familiar with a hash table you will be pretty familiar with this already

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My favorite is   HashMap lt Type1  Type2 gt    All you have to do is specify the datatype for the key for Type1 and the datatype for the value for Type2  It s the most common key-value object I ve seen in Java   https   docs oracle com javase 7 docs api java util HashMap html

[java] A KeyValuePair in Java

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