如何按值对ConcurrentHashMap排序?

问题描述

ConcurrentHashMap<String,Integer> pl = new ConcurrentHashMap<>();
pl.put("joker25", 255);
pl.put("minas", 55);
pl.put("agoriraso", 122);
pl.put("pigasakias", 1024);
pl.put("geo5", 5092);

我已经搜索了，但找不到任何东西.如何按值对ConcurrentHashMap排序?

I've searched and I can't find anything. How do I sort my ConcurrentHashMap by values?

minas,25
agoriraso,122
joker25,255
pigasakias,1024
geo5,5092

我该怎么做?

推荐答案

由于ConcurrentHashMap不保证订购，因此您必须将这些项目转储到列表中然后进行排序.例如:

Since ConcurrentHashMap makes no guarantees about ordering you'll have to dump the items into a list and then sort that. For example:

final Map<String, Integer> pl = ....
List<String> values = new ArrayList<>(pl.keySet());
Collections.sort(values, new Comparator<String>() {
  public int compare(String a, String b) {
    // no need to worry about nulls as we know a and b are both in pl
    return pl.get(a) - pl.get(b);
  }
});

for(String val : values) {
  System.out.println(val + "," + pl.get(val));
}

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