Using Pairs or 2-tuples in Java

In Java, you can use the javafx.util.Pair class to represent a pair or 2-tuple. This class is part of the JavaFX library and is available in Java 8 and later.

Here's an example of how to use the Pair class:

import javafx.util.Pair;

Pair<String, Integer> pair = new Pair<>("Alice", 42);
String first = pair.getKey();
int second = pair.getValue();

System.out.println(first); // Outputs "Alice"
System.out.println(second); // Outputs 42

If you do not want to use the Pair class from the JavaFX library, you can also define your own pair class using a regular Java class.

Here's an example:

public class Pair<T, U> {
    private final T first;
    private final U second;

    public Pair(T first, U second) {
        this.first = first;
        this.second = second;
    }

    public T getFirst() {
        return first;
    }

    public U getSecond() {
        return second;
    }
}

You can then use the Pair class as follows:

Pair<String, Integer> pair = new Pair<>("Alice", 42);
String first = pair.getFirst();
int second = pair.getSecond();

System.out.println(first); // Outputs "Alice"
System.out.println(second); // Outputs 42

I hope this helps! Let me know if you have any other questions.