Sort Map by Value in Java: Explanation & Practice

Problem summary

Write a program that sorts a Map by its values in descending order.

Starter code

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Map<String, Integer> scores = new HashMap<>();
        scores.put("Alice", 85);
        scores.put("Bob", 92);
        scores.put("Carol", 78); // Test case 1
        
        // Sort by score (descending)
        // Print: name: score
    }
}

Expected output and test cases

• Sorted by score

  Bob: 92
  Alice: 85
  Carol: 78

• Different scores

  A: 100
  B: 90
  C: 80

• Single entry

  X: 50

Hints

1. Get entrySet() from map
2. Sort using Comparator
3. Compare by entry.getValue()

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• Practice List Intersection in Java
• Practice Group By Property in Java

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