El método iterator () de CopyOnWriteArrayList devuelve un iterador sobre los elementos de esta lista en la secuencia adecuada. El iterador NO admite el método de eliminación.
Sintaxis:
public Iterator iterator()
Parámetros: La función no acepta ningún parámetro.
Valor devuelto: la función devuelve un iterador sobre los elementos de la lista.
Los siguientes programas ilustran la función anterior:
Programa 1:
// Java Program to illustrate the CopyOnWriteArrayList
// iterator() method in Java
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create object of CopyOnWriteArrayList
CopyOnWriteArrayList<Integer> ArrLis
= new CopyOnWriteArrayList<Integer>();
// Add elements
ArrLis.add(32);
ArrLis.add(67);
ArrLis.add(67);
ArrLis.add(100);
// print CopyOnWriteArrayList
System.out.println("CopyOnWriteArrayList: " + ArrLis);
// Call iterator() method of
Iterator iteratorVals = ArrLis.iterator();
// Print elements of iterator
// created from CopyOnWriteArrayList
System.out.println("The iterator values"
+ " of CopyOnWriteArrayList are:");
// prints the elements using an iterator
while (iteratorVals.hasNext()) {
System.out.println(iteratorVals.next());
}
}
}
Producción:
CopyOnWriteArrayList: [32, 67, 67, 100] The iterator values of CopyOnWriteArrayList are: 32 67 67 100
Programa 2:
// Java Program to illustrate the CopyOnWriteArrayList
// iterator() method in Java
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create object of CopyOnWriteArrayList
CopyOnWriteArrayList<String> ArrLis
= new CopyOnWriteArrayList<String>();
// Add elements
ArrLis.add("gopal");
ArrLis.add("gfg");
ArrLis.add("jgec");
ArrLis.add("sudo");
// print CopyOnWriteArrayList
System.out.println("CopyOnWriteArrayList: " + ArrLis);
// Call iterator() method of
Iterator iteratorVals = ArrLis.iterator();
// Print elements of iterator
// created from CopyOnWriteArrayList
System.out.println("The iterator values"
+ " of CopyOnWriteArrayList are:");
// prints the elements using an iterator
while (iteratorVals.hasNext()) {
System.out.println(iteratorVals.next());
}
}
}
Producción:
CopyOnWriteArrayList: [gopal, gfg, jgec, sudo] The iterator values of CopyOnWriteArrayList are: gopal gfg jgec sudo
Referencia: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArrayList.html#iterator–