Java?? ?? ???? ? ? ??

?? ???? ?? ?? ????? ??? ???? TreeMap ?? ??? ?? SortedSet? ???? ?? ????. ???.

?? TreeMap

• TreeMap? ?? ??? ??? ???? ?? Map ?????.
• ???? ?? ???? TreeMap? ????? ? TreeMap.

?? SortedSet

• Map? ??? TreeMap? ?? ?? TreeSet? ???? ?? SortedSet? ??? ? ????.
• ?? ?? ??? ?? ??? ? ????. ?????.

?? ?:

import java.util.SortedSet;
import java.util.TreeMap;
import java.util.TreeSet;

public class MapSortByKey {

    // Using TreeMap
    public static void sortByTreeMap() {
        Map<String, String> map = new TreeMap<>();
        map.put("question1", "1");
        map.put("question9", "1");
        map.put("question2", "4");
        map.put("question5", "2");

        // Iterate through the sorted map
        StringBuilder questionString = new StringBuilder();
        StringBuilder answerString = new StringBuilder();
        for (Map.Entry<String, String> entry : map.entrySet()) {
            questionString.append(entry.getKey() + ",");
            answerString.append(entry.getValue() + ",");
        }

        // Remove the trailing commas
        questionString.setLength(questionString.length() - 1);
        answerString.setLength(answerString.length() - 1);

        System.out.println("Questions: " + questionString);
        System.out.println("Answers: " + answerString);
    }

    // Using SortedSet
    public static void sortBySortedSet() {
        Map<String, String> map = new HashMap<>();
        map.put("question1", "1");
        map.put("question9", "1");
        map.put("question2", "4");
        map.put("question5", "2");

        // Create a sorted set of the keys
        SortedSet<String> keys = new TreeSet<>(map.keySet());

        // Iterate through the sorted keys
        StringBuilder questionString = new StringBuilder();
        StringBuilder answerString = new StringBuilder();
        for (String key : keys) {
            String value = map.get(key);
            questionString.append(key + ",");
            answerString.append(value + ",");
        }

        // Remove the trailing commas
        questionString.setLength(questionString.length() - 1);
        answerString.setLength(answerString.length() - 1);

        System.out.println("Questions: " + questionString);
        System.out.println("Answers: " + answerString);
    }

    public static void main(String[] args) {
        sortByTreeMap();
        sortBySortedSet();
    }
}

? ??? Java?? ?? ???? ?? ?? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!