int[] prices = new int[1000000]; ObjectPool<MyObject> objectPool = new ObjectPool<>(MyObject::new); MyObject obj = objectPool.borrowObject(); objectPool.returnObject(obj); ConcurrentHashMap<String, Integer> map = new ConcurrentHashMap<>(); map.put("key", 1); int value = map.get("key"); CacheManager cacheManager = CacheManagerBuilder.newCacheManagerBuilder() .withCache("myCache", CacheConfigurationBuilder.newCacheConfigurationBuilder() .buildConfig(KeyType.String, ValueType.Integer)) .build(true); Cache<String, Integer> cache = cacheManager.getCache("myCache", String.class, Integer.class); cache.put("key", 1); int value = cache.get("key");