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  1. import java.util.HashMap;
  2. import java.util.Map;
  3. import java.util.function.Predicate;
  4. import java.util.stream.Collectors;
  5. import java.util.stream.Stream;
  6.  
  7. class Ideone {
  8.     public static void main(String[] args) {
  9.         Map<Predicate<String>, String> gbu = new HashMap<>();
  10.         gbu.put(x -> x.contains("a"), "good");
  11.         gbu.put(x -> x.contains("b"), "bad");
  12.         gbu.put(x -> x.contains("c"), "ugly");
  13.  
  14.         Stream.of("bad", "abc", "a")
  15.                 .map(str ->
  16.                         str + ":\t" + gbu.entrySet().stream()
  17.                         .filter(entry -> entry.getKey().test(str))
  18.                                 .map(Map.Entry::getValue)
  19.                                 .collect(Collectors.joining(", "))
  20.                 )
  21.                 .forEach(System.out::println);
  22.     }
  23. }
Success #stdin #stdout 0.16s 56192KB
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stdin
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Standard input is empty
stdout
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bad:	good, bad
abc:	good, bad, ugly
a:	good
https://ideone.com/jC12UZ
language:
Java (HotSpot 12)
created:
125 days ago
visibility:
secret

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