A KeyValuePair in Java [duplicate]

Answer 1

Hashtable<String, Object>

It is better than java.util.Properties which is by fact an extension of Hashtable<Object, Object>.

Answer 2

My favorite is

HashMap<Type1, Type2>

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

Answer 3

Use of javafx.util.Pair is sufficient for most simple Key-Value pairings of any two types that can be instantiated.

Pair<Integer, String> myPair = new Pair<>(7, "Seven");
Integer key = myPair.getKey();
String value = myPair.getValue();

Answer 4

Android programmers could use BasicNameValuePair

Update:

BasicNameValuePair is now deprecated (API 22). Use Pair instead.

Example usage:

Pair<Integer, String> simplePair = new Pair<>(42, "Second");
Integer first = simplePair.first; // 42
String second = simplePair.second; // "Second"

Answer 5

The class AbstractMap.SimpleEntry is generic and can be useful.

Answer 6

The Pair class from Commons Lang might help:

Pair<String, String> keyValue = new ImmutablePair("key", "value");

Of course, you would need to include commons-lang.