public class Fanxingtest {
    public static void main(String[] args) {
        Fanxing<Integer, String> fanxing = new Fanxing<>(888, "Fanxingtest");
        System.out.println("原始Pair:");
        System.out.println("Key: " + fanxing.getKey());
        System.out.println("Value: " + fanxing.getValue());
        
        Fanxing<String, Integer> swapped = Fanxing.swap(fanxing);
        System.out.println("\n交换后的Pair:");
        System.out.println("Key: " + swapped.getKey());
        System.out.println("Value: " + swapped.getValue());
    }
}