java/src/w8/W88/Cache.java

package w8.W88;

import java.util.concurrent.ConcurrentHashMap;

public class Cache<K, V> {
    private ConcurrentHashMap<K, V> cache;
    private long defaultTTL;

    public Cache() {
        this.cache = new ConcurrentHashMap<>();
        this.defaultTTL = 60000;
    }

    public Cache(long ttlMillis) {
        this.cache = new ConcurrentHashMap<>();
        this.defaultTTL = ttlMillis;
    }

    public void put(K key, V value) {
        if (key == null) {
            System.out.println("Error: Key cannot be null");
            return;
        }
        cache.put(key, value);
        System.out.println("Cache put: " + key + " = " + value);
    }

    public V get(K key) {
        if (key == null) {
            System.out.println("Error: Key cannot be null");
            return null;
        }
        V value = cache.get(key);
        if (value == null) {
            System.out.println("Cache miss: " + key + " not found");
            return null;
        }
        System.out.println("Cache hit: " + key + " = " + value);
        return value;
    }

    public void remove(K key) {
        cache.remove(key);
        System.out.println("Cache removed: " + key);
    }

    public void clear() {
        cache.clear();
        System.out.println("Cache cleared");
    }

    public int size() {
        return cache.size();
    }

    public boolean containsKey(K key) {
        return cache.containsKey(key);
    }
}