public class TestMain {
    public static void main(String[] args) {
        // 测试 Pair
        Pair<String, Integer> pair = new Pair<>("年龄", 20);
        System.out.println("原来：" + pair);

        Pair<Integer, String> afterSwap = Pair.swap(pair);
        System.out.println("交换后：" + afterSwap);

        // 测试 Cache
        System.out.println("\n=== 测试缓存 ===");
        Cache<String, Integer> cache = new Cache<>();

        cache.put("语文", 90);
        cache.put("数学", 95);

        System.out.println("获取语文：" + cache.get("语文"));
        cache.printAll();
    }
}