ConcurrentLinkedHashMap<String, String> cache = new ConcurrentLinkedHashMap.Builder<String, String>() .build(); cache.put("key1", "value1"); cache.put("key2", "value2"); cache.put("key3", "value3"); ConcurrentLinkedHashMap<String, String> cache = new ConcurrentLinkedHashMap.Builder<String, String>() .build();