// collectiontopics/FailFast.java

// (c)2017 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// 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

*/