从Java中的Map中选择随机密钥和值集 [英] Selecting random key and value sets from a Map in Java

问题描述

我想从地图中获取随机密钥及其各自的值。这个想法是随机生成器会选择一个键并显示该值。棘手的部分是键和值都是字符串，例如 myMap.put（Geddy，Lee）。

解决方案

  HashMap< String，String> X; 
 
随机random = new Random（）; 
列表< String> keys = new ArrayList< String>（x.keySet（））; 
 String randomKey = keys.get（random.nextInt（keys.size（）））; 
 String value = x.get（randomKey）; 
  

I want to get random keys and their respective values from a Map. The idea is that a random generator would pick a key and display that value. The tricky part is that both key and value will be strings, for example myMap.put("Geddy", "Lee").

解决方案

HashMap<String, String> x;

Random       random    = new Random();
List<String> keys      = new ArrayList<String>(x.keySet());
String       randomKey = keys.get( random.nextInt(keys.size()) );
String       value     = x.get(randomKey);

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