Generic pair class

Question

Just attempting this question I found in a past exam paper so that I can prepare for an upcoming Java examination.

Provide a generic class Pair for representing pair

Answer 1

I implemented something similar but with static builder and chained setters

public class Pair {

private R left;
private L right;

public static  Pair of(K k, V v) {
    return new Pair(k, v);
}

public Pair() {}

public Pair(R key, L value) {
    this.left(key);
    this.right(value);
}

public R left() {
    return left;
}

public Pair left(R key) {
    this.left = key;
    return this;
}

public L right() {
    return right;
}

public Pair right(L value) {
    this.right = value;
    return this;
}
}