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  1. import java.util.*;
  2.  
  3. class Example
  4. {
  5. 	public static void main (String[] args) throws java.lang.Exception
  6. 	{
  7. 		var routingTable = new ArrayList<String>();
  8. 		routingTable.add("one");
  9. 		routingTable.add("two");
  10. 		routingTable.add("three");
  11. 		synchronized (routingTable) {
  12. 			for (String entry : routingTable) {
  13. 				if (entry.equals("two")) {
  14. 					routingTable.add("four");
  15. 				}
  16. 			}
  17. 		}
  18. 	}
  19. }
Runtime error #stdin #stdout #stderr 0.06s 32444KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
stderr 
Exception in thread "main" java.util.ConcurrentModificationException
	at java.base/java.util.ArrayList$Itr.checkForComodification(ArrayList.java:1042)
	at java.base/java.util.ArrayList$Itr.next(ArrayList.java:996)
	at Example.main(Main.java:12)
https://ideone.com/jMx7Lx
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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