package fx;

public class Pair<K, V> {
    private K key;
    private V value;

    public Pair(K key, V value) {
        this.key = key;
        this.value = value;
    }

    public K getKey() { return key; }
    public V getValue() { return value; }

    public void setKey(K key) { this.key = key; }
    public void setValue(V value) { this.value = value; }

    // swap：交换 key 和 value 的类型和值
    public Pair<V, K> swap() {
        return new Pair<>(value, key);
    }

    @Override
    public String toString() {
        return "(" + key + ", " + value + ")";
    }
}