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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import java.util.stream.Collectors;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class Ideone
  10. {
  11. 	public static void main (String[] args) throws java.lang.Exception
  12. 	{
  13. 		Map<String,Character> map = new HashMap<>();
  14. 		map.put("Apple",'a');
  15. 		map.put("Ball",'b');
  16. 		map.put("Cat",'c');
  17. 		String format="aabbbbr";
  18.  
  19. 		List<String> list = format.chars().mapToObj(i -> (char) i).distinct()
  20.                         .map(c -> map.entrySet().stream()
  21.                                 .filter(entry -> entry.getValue() == c).findFirst().get().getKey())
  22.                         .collect(Collectors.toList());
  23.  
  24.                         System.out.println(list);
  25.  
  26. 	}
  27. }
Runtime error #stdin #stdout #stderr 0.13s 34752KB
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Standard input is empty
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Standard output is empty
stderr
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Exception in thread "main" java.util.NoSuchElementException: No value present
	at java.base/java.util.Optional.get(Optional.java:148)
	at Ideone.lambda$main$2(Main.java:21)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
	at java.base/java.util.stream.DistinctOps$1$2.accept(DistinctOps.java:174)
	at java.base/java.util.stream.IntPipeline$1$1.accept(IntPipeline.java:180)
	at java.base/java.lang.StringLatin1$CharsSpliterator.forEachRemaining(StringLatin1.java:837)
	at java.base/java.util.Spliterator$OfInt.forEachRemaining(Spliterator.java:699)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
	at Ideone.main(Main.java:22)
https://ideone.com/Kb2WoN
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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