<dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>30.1-jre</version> </dependency> ConcurrentMap<String, String> cache = new ConcurrentLinkedHashMap.Builder<String, String>() .maximumWeightedCapacity(100) .build(); cache.put("key", "value"); String value = cache.get("key"); cache.remove("key");