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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. 	static void test_1() {
  11. 		ArrayList<Integer> list = new ArrayList<>( Arrays.asList( 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ) );
  12.  
  13.         for (Integer i : list)
  14.             if (i > 10)
  15.                 list.remove(i);
  16.  
  17.         System.out.println( "test_1 success: " + list );
  18. 	}
  19.  
  20. 	static void test_2() {
  21. 		ArrayList<Integer> list = new ArrayList<>( Arrays.asList( 11, 12, 13, 14 ) );
  22.  
  23.         for (Integer i : list)
  24.             if (i > 10)
  25.                 list.remove(i);
  26.  
  27.         System.out.println( "test_2 success: " + list );
  28. 	}
  29.  
  30. 	public static void main (String[] args) throws java.lang.Exception
  31. 	{
  32. 		test_1();
  33.  
  34. 		try {
  35. 			test_2();
  36. 		} catch ( Exception ex ) {
  37. 			System.out.println( "test 2 failed: " + ex );
  38. 		}
  39. 	}
  40. }
Success #stdin #stdout 0.09s 320576KB
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stdin
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Standard input is empty
stdout
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test_1 success: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
test 2 failed: java.util.ConcurrentModificationException
https://ideone.com/FuDKb7
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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