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  1. import java.util.HashMap;
  2. import java.util.Map;
  3.  
  4. public class Main {
  5.     public static void main(String[] args) {
  6.         String text = "Hello world hello Hadoop Hadoop MapReduce world MapReduce world";
  7.         String[] words = text.split("\\s+");
  8.         Map<String, Integer> wordCount = new HashMap<>();
  9.         for (String word : words) {
  10.             word = word.toLowerCase().replaceAll("[^a-z0-9]", ""); 
  11.             if (!word.isEmpty()) {
  12.                 wordCount.put(word, wordCount.getOrDefault(word, 0) + 1);
  13.             }
  14.         }
  15.         System.out.println("=== Word Count Results ===");
  16.         for (Map.Entry<String, Integer> entry : wordCount.entrySet()) {
  17.             System.out.println(entry.getKey() + " : " + entry.getValue());
  18.         }
  19.     }
  20. }
  21.  
Success #stdin #stdout 0.2s 56140KB
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stdin
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mapreduce
stdout
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=== Word Count Results ===
world : 3
mapreduce : 2
hello : 2
hadoop : 2
https://ideone.com/D7H4yr
language:
Java (HotSpot 12)
created:
2 days ago
visibility:
public

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