Using Pairs or 2-tuples in Java

Java does not include a built-in Pair or 2-tuple class in its core language. However, developers often need a simple way to group two related values without creating a separate class. Thankfully, several reliable options exist through the Java ecosystem and standard libraries.

 Popular ways to use Pairs in Java:

Using AbstractMap.SimpleEntry or SimpleImmutableEntry

   Pair p = new AbstractMap.SimpleEntry<>("Apple", 10);

• Part of standard Java (java.util)
  
• Ideal for key-value style pairing
  

Using JavaFX’s Pair class

 import javafx.util.Pair;

Pair pair = new Pair<>("Name", 25);

• Very easy to use but requires JavaFX dependencies
  

Using custom Pair class

 class Pair {

    public A first;

    public B second;

    Pair(A first, B second) { this.first = first; this.second = second; }

}

• Good for full control and readability
  
• Recommended if Pairs are a common need in your codebase
  

Using external libraries

• Apache Commons: Pair & ImmutablePair
  
• Vavr: Tuples up to 8+ elements
  
• These provide clean APIs and immutability options
  

 When to use Pairs?

• Returning two values from a method
  
• Storing small linked data structures
  
• Avoiding unnecessary custom classes for quick grouping
  

 When NOT to use Pairs?

• If the data has meaningful names — a proper class improves clarity
  

In summary, even though Java does not provide a direct Pair type, there are many great alternatives like JavaFX Pair, Apache Commons Pair, or simply creating your own lightweight class.