Map<String,String> hashMap =newHashMap<>();longbeginTime =System.currentTimeMillis(); System.out.println("hashMap存储开始时间-->"+beginTime);for(inti = 0; i <1000000; i++) { hashMap.put(UUID.randomUUID().toString(),
Set<String> keySet = hashMap.keySet(); for (String s : keySet) { System.out.println(s+":"+hashMap.get(s)); } long endTime2 = System.currentTimeMillis(); System.out.println("hashMap【keySet方式】读取结束时间-->"+endTime2); System.out.println("hashMap【keySet方式】读取消耗:"+(en...