CopyOnWriteArraySet - fail-safe or fail-fast iteration using iterator, Enumeration and enhanced for loop program.
iterator returned by CopyOnWriteArraySet is fail-safe. Means any structural modification made to CopyOnWriteArraySet like adding or removing elements during Iteration won’t throw any Exception.
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
/**
* Copyright (c), AnkitMittal JavaMadeSoEasy.com
*/
public class CopyOnWriteArraySetTest {
public static void main(String args[]) {
Set<String> copyOnWriteArraySet = new CopyOnWriteArraySet<String>();
copyOnWriteArraySet.add("ankit");
copyOnWriteArraySet.add("javaMadeSoEasy");
System.out.println("-------use iterator-------");
// fail-safe
Iterator<String> iterator = copyOnWriteArraySet.iterator();
while (iterator.hasNext()) {
copyOnWriteArraySet.add("newElement1");
System.out.println(iterator.next());
}
System.out.println("-------use Enumeration-------");
// fail-safe
Enumeration<String> listEnum = Collections.enumeration(copyOnWriteArraySet);
while (listEnum.hasMoreElements()) {
copyOnWriteArraySet.add("newElement2");
System.out.println(listEnum.nextElement());
}
System.out.println("-------use enhanced for loop-------");
// enhanced for loop is fail-safe
for (String string : copyOnWriteArraySet) {
copyOnWriteArraySet.add("newElement3");
System.out.println(string);
}
}
}
/*OUTPUT
-------use iterator-------
ankit
javaMadeSoEasy
-------use Enumeration-------
ankit
javaMadeSoEasy
newElement1
-------use enhanced for loop-------
ankit
javaMadeSoEasy
newElement1
newElement2
*/
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CopyOnWriteArraySet - iterate using iterator, Enumeration and enhanced for loop program
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Collection programs
Core Java