How Can I Sort a Java Map's Values by Key?

Sorting Map Values by Key in Java

To sort a map in Java based on its keys, utilizing a TreeMap is the recommended solution. TreeMaps inherently maintain a sorted order of keys. If the map being worked with is not a TreeMap, it can be converted using the following approach:

SortedSet<String> keys = new TreeSet<>(map.keySet());

This creates a sorted set of the map's keys, which can then be iterated over in sorted order, accessing the corresponding values from the original map.

Here's a code snippet demonstrating this technique:

SortedSet<String> sortedKeys = new TreeSet<>(paramMap.keySet());
String questions = "";
String answers = "";

for (String key : sortedKeys) {
    questions += key + ",";
    answers += paramMap.get(key) + ",";
}

This will create two strings: one containing the sorted questions and the other containing the corresponding answers, all arranged in the desired order.

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