OnJava8-Examples/containersindepth/FailFast.java

// containersindepth/FailFast.java
// Demonstrates the "fail-fast" behavior.
import java.util.*;

public class FailFast {
  public static void main(String[] args) {
    Collection<String> c = new ArrayList<>();
    Iterator<String> it = c.iterator();
    c.add("An object");
    try {
      String s = it.next();
    } catch(ConcurrentModificationException e) {
      System.out.println(e);
    }
  }
}
/* Output:
java.util.ConcurrentModificationException
*/