Main.java

package com.sayandip.kvstore;

public class Main {
    public static void main(String[] args) throws InterruptedException {
        KVStore<String, String> store = new KVStore<>(3);

        store.put("a", "apple");
        store.put("b", "banana");
        store.put("c", "cherry");
        System.out.println("get a: " + store.get("a")); // touching a makes it MRU

        store.put("d", "date"); // capacity=3 exceeded -> evicts LRU, which is now "b"
        System.out.println("get b (expect evicted -> null): " + store.get("b"));
        System.out.println("get d: " + store.get("d"));

        store.put("temp", "will expire", 2); // 2 second TTL
        System.out.println("get temp (immediate): " + store.get("temp"));
        Thread.sleep(2500);
        System.out.println("get temp (after ttl -> expect null): " + store.get("temp"));

        store.shutdown();
    }
}