Java - create generic pair (tuples, point)

public class Pair<A, B> {

    private final A a;

    private final B b;

​

    public Pair(A a, B b) {

        this.a = a;

        this.b = b;

    }

​

    public A getA() {

        return a;

    }

​

    public B getB() {

        return b;

    }

​

    @Override

    public String toString() {

        return "Pair{" +

                "a=" + a +

                ", b=" + b +

                '}';

    }

​

    public static void main(String[] args) {

        {

            Pair<String, String> pair = new Pair<>("A", "B");

            String a = pair.getA();

            String b = pair.getB();

            System.out.println(pair); // Pair{a=A, b=B}

        }

​

        {

            Pair<Double, Double> pair = new Pair<>(0.2, 3.14);

            Double a = pair.getA();

            Double b = pair.getB();

            System.out.println(pair); // Pair{a=0.2, b=3.14}

        }

​

        {

            Pair<Integer, Integer> pair = new Pair<>(10, 25);

            Integer a = pair.getA();

            Integer b = pair.getB();

            System.out.println(pair); // Pair{a=10, b=25}

        }

​

        {

            Pair<Pair<Integer, Integer>, Pair<String, String>> pair

                    = new Pair<>(new Pair<>(10, 25), new Pair<>("A", "B"));

            Pair<Integer, Integer> a = pair.getA();

            Pair<String, String> b = pair.getB();

            System.out.println(pair); // Pair{a=Pair{a=10, b=25}, b=Pair{a=A, b=B}}

        }

    }

}

Pair{a=A, b=B}

Pair{a=0.2, b=3.14}

Pair{a=10, b=25}

Pair{a=Pair{a=10, b=25}, b=Pair{a=A, b=B}}