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  1. import java.util.*;
  2.  
  3. class WordCounter {
  4.  
  5.     public static Map<String, Integer> countWords(String text) {
  6.         Map<String, Integer> countsByNormalized = new HashMap<>();
  7.         Map<String, String> displayByNormalized = new HashMap<>();
  8.  
  9.         if (text == null || text.isBlank()) {
  10.             return Collections.emptyMap();
  11.         }
  12.  
  13.         String[] tokens = text.split("\\s+");
  14.         for (String raw : tokens) {
  15.             if (raw == null || raw.isEmpty()) continue;
  16.  
  17.             String originalLower = raw.toLowerCase(Locale.ROOT);
  18.  
  19.             String normalized = originalLower.replaceAll("^[^\\p{L}\\p{N}]+|[^\\p{L}\\p{N}]+$", "");
  20.  
  21.             if (normalized.isEmpty()) continue;
  22.  
  23.             displayByNormalized.putIfAbsent(normalized, originalLower);
  24.  
  25.             countsByNormalized.put(normalized, countsByNormalized.getOrDefault(normalized, 0) + 1);
  26.         }
  27.  
  28.         Map<String, Integer> result = new LinkedHashMap<>();
  29.         for (Map.Entry<String, Integer> e : countsByNormalized.entrySet()) {
  30.             String normalized = e.getKey();
  31.             String display = displayByNormalized.get(normalized);
  32.             result.put(display, e.getValue());
  33.         }
  34.  
  35.         return result;
  36.     }
  37.  
  38.     public static void printSortedByKey(Map<String,Integer> map) {
  39.         map.entrySet().stream()
  40.                 .sorted(Map.Entry.comparingByKey())
  41.                 .forEach(e -> System.out.println(e.getKey() + " → " + e.getValue()));
  42.     }
  43.  
  44.     public static void main(String[] args) {
  45.         String input = "This is a test. This is only a test";
  46.         Map<String, Integer> counts = countWords(input);
  47.  
  48.         printSortedByKey(counts);
  49.     }
  50. }
  51.  
  52.  
  53.  
Success #stdin #stdout 0.17s 56600KB
comments (?)
stdin
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Standard input is empty
stdout
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a → 2
is → 2
only → 1
test. → 2
this → 2
https://ideone.com/IRjMLg
language:
Java (HotSpot 12)
created:
3 hours ago
visibility:
public

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