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  1. import java.util.HashMap;
  2. import java.util.Map;
  3. import java.util.Map.Entry;
  4. import java.util.concurrent.atomic.AtomicInteger;
  5. import java.util.regex.Matcher;
  6. import java.util.regex.Pattern;
  7.  
  8. class Ideone {
  9. 	public static void main(String[] args) {
  10. 		test("I like visiting my friend Will, who lives in Orlando, Florida.");
  11. 	}
  12. 	private static void test(String input) {
  13. 		Map<Integer, AtomicInteger> wordCounts = new HashMap<>();
  14. 		for (Matcher m = Pattern.compile("\\p{L}+").matcher(input); m.find(); ) {
  15. 			m.group().codePoints().map(Character::toUpperCase).distinct().forEach(ch ->
  16. 					wordCounts.computeIfAbsent(ch, c -> new AtomicInteger()).incrementAndGet());
  17. 		}
  18. 		if (wordCounts.isEmpty())
  19. 			throw new IllegalArgumentException("No words in input: " + input);
  20. 		Entry<Integer, AtomicInteger> max = wordCounts.entrySet().stream().
  21. 				reduce((e1, e2) -> e1.getValue().get() >= e2.getValue().get() ? e1 : e2).get();
  22. 		System.out.printf("%s %d%n", new String(Character.toChars(max.getKey())), max.getValue().get());
  23. 	}
  24. }
Success #stdin #stdout 0.1s 711680KB
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I 8
https://ideone.com/Tqpgz1
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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