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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.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 	    HashMap<Integer, Integer> m = new HashMap<>();
  13.         m.put(1, 2);
  14.         m.forEach((k, v) -> {
  15.             m.put(-k, -v);
  16.         });
  17. 	}
  18. }
Runtime error #stdin #stdout #stderr 0.19s 33292KB
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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.ConcurrentModificationException
	at java.util.HashMap.forEach(HashMap.java:1291)
	at Ideone.main(Main.java:14)
https://ideone.com/SRtWiJ
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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