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I have the following HashMap:
HashMap<String, Integer> counts = new HashMap<String, Integer>();
What is the simplest way to order it according to the values?
953
We can sort the entries in a HashMap according to keys as well as values. In this tutorial we will sort the HashMap according to value. The basic strategy is to get the values from the HashMap in a list and sort the list. Here if the data type of Value is String, then we sort the list using a comparator.
HashMap stores key, value pairs and it does not allow duplicate keys. If the key is duplicate then the old key is replaced with the new value.
In order to sort in decreasing order, just reverse the order of Comparator using Collections. reverseOrder() or Comparator.
You can't sort a Map by the values, especially not a HashMap, which can't be sorted at all.
Instead, you can sort the entries:
List<Map.Entry<String, Integer>> entries = new ArrayList<Map.Entry<String, Integer>>(map.entrySet());
Collections.sort(entries, new Comparator<Map.Entry<String, Integer>>() {
public int compare(
Map.Entry<String, Integer> entry1, Map.Entry<String, Integer> entry2) {
return entry1.getValue().compareTo(entry2.getValue());
}
});
will sort the entries in ascending order of count.
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