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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. 		List<MyObject> list = new ArrayList<>();
  13. 		list.add(new MyObject("abc"));
  14. 		list.add(new MyObject("def"));
  15. 		list.add(new MyObject("ghi"));
  16.  
  17. 		try {
  18. 			for(int i = 0; i < list.size(); i++)
  19. 			{
  20. 				if(list.get(i).Id.compareTo("def") >= 0)
  21. 				{
  22. 					list.remove(list.get(i));
  23. 				}
  24. 			}
  25. 		} catch (Exception e)
  26. 		{
  27. 			System.out.println(e.getMessage());
  28. 		}
  29.  
  30. 		for(MyObject obj : list)
  31. 		{
  32. 			if(obj.Id.compareTo("def") >= 0)
  33. 			{
  34. 				list.remove(obj);
  35. 			}
  36. 		}
  37.  
  38. 		System.out.println(list.size());
  39. 	}
  40. }
  41.  
  42. class MyObject
  43. {
  44. 	public String Id;
  45.  
  46. 	public MyObject(String id) {
  47. 		Id = id;
  48. 	}
  49. }
Runtime error #stdin #stdout #stderr 0.12s 320576KB
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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.ArrayList$Itr.checkForComodification(ArrayList.java:901)
	at java.util.ArrayList$Itr.next(ArrayList.java:851)
	at Ideone.main(Main.java:30)
https://ideone.com/rzNjCV
language:
Java (12.0.1)
created:
10 years ago
visibility:
public

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