import net.openhft.collections.SharedHashMap; public class Example { public static void main(String[] args) { SharedHashMap<String, Integer> map = new SharedHashMap.Builder() .entries(1000000) .create(); map.put("key1", 1); map.put("key2", 2); map.put("key3", 3); int value = map.get("key1"); map.remove("key2"); map.forEach((key, val) -> System.out.println(key + ": " + val)); } }