Java8-Concurrency

import java.util.UUID;import java.util.concurrent.ConcurrentHashMap;public class Concurrency1 {    public static void main(String[] args) {        ConcurrentHashMap<Integer, UUID> concurrentHashMap = new ConcurrentHashMap<>();        for (int i = 0; i < 100; i++) {            concurrentHashMap.put(i, UUID.randomUUID());        }        int threshold = 1;        concurrentHashMap.forEachValue(threshold, System.out::println);        concurrentHashMap.forEach((id, uuid) -> {            if (id % 10 == 0) {                System.out.println(String.format("%s: %s", id, uuid));            }        });        UUID searchResult = concurrentHashMap.search(threshold, (id, uuid) -> {            if (String.valueOf(uuid).startsWith(String.valueOf(id))) {                return uuid;            }            return null;        });        System.out.println(searchResult);    }}