El método addAll() de ConcurrentLinkedQueue se utiliza para insertar todos los elementos de la Colección, pasados como parámetro a este método, al final de una ConcurrentLinkedQueue. La inserción del elemento está en el mismo orden en que lo devuelve el iterador de colecciones.
Sintaxis:
public boolean addAll(Collection<? extends E> c)
Parámetro: este método toma un parámetro c que representa la colección cuyos elementos se necesitan agregar al final de esta ConcurrentLinkedQueue.
Devoluciones: este método devuelve verdadero si se realiza al menos una acción de inserción.
Excepción: este método arroja dos excepciones diferentes:
- NullPointerException : si la colección pasada o cualquiera de sus elementos son nulos.
- IllegalArgumentException : si la colección pasada es esta misma cola.
Los siguientes programas ilustran el método addAll() de ConcurrentLinkedQueue:
Ejemplo 1: intentar agregar una lista de números a ConcurrentLinkedQueue.
// Java Program Demonstrate addAll()
// method of ConcurrentLinkedQueue
import java.util.concurrent.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create an ConcurrentLinkedQueue
ConcurrentLinkedQueue<Integer>
queue = new ConcurrentLinkedQueue<Integer>();
// Add Numbers to queue
queue.add(4353);
// create a ArrayList of Numbers
ArrayList<Integer> arraylist = new ArrayList<Integer>();
// add some numbers to ArrayList
arraylist.add(377139);
arraylist.add(624378);
arraylist.add(654793);
arraylist.add(764764);
arraylist.add(838494);
arraylist.add(632845);
// Displaying the existing ConcurrentLinkedQueue
System.out.println("ConcurrentLinkedQueue: " + queue);
// Displaying the existing Collection
System.out.println("Collection to be added: " + arraylist);
// apply addAll() method and passed the arraylist as parameter
boolean response = queue.addAll(arraylist);
// Displaying the existing ConcurrentLinkedQueue
System.out.println("Collection added: " + response);
// Displaying the existing ConcurrentLinkedQueue
System.out.println("ConcurrentLinkedQueue: " + queue);
}
}
Producción:
ConcurrentLinkedQueue: [4353] Collection to be added: [377139, 624378, 654793, 764764, 838494, 632845] Collection added: true ConcurrentLinkedQueue: [4353, 377139, 624378, 654793, 764764, 838494, 632845]
Ejemplo 2: intentar agregar una lista de strings a ConcurrentLinkedQueue.
// Java Program Demonstrate addAll()
// method of ConcurrentLinkedQueue
import java.util.concurrent.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create an ConcurrentLinkedQueue
ConcurrentLinkedQueue<String>
queue = new ConcurrentLinkedQueue<String>();
// Add String to queue
queue.add("Aman");
queue.add("Amar");
// create a ArrayList of Numbers
ArrayList<String> arraylist = new ArrayList<String>();
// add some numbers to ArrayList
arraylist.add("Sanjeet");
arraylist.add("Rabi");
arraylist.add("Debasis");
arraylist.add("Raunak");
arraylist.add("Mahesh");
// Displaying the existing ConcurrentLinkedQueue
System.out.println("ConcurrentLinkedQueue: " + queue);
// Displaying the existing Collection
System.out.println("Collection to be added: " + arraylist);
// apply addAll() method and passed the arraylist as parameter
boolean response = queue.addAll(arraylist);
// Displaying the existing ConcurrentLinkedQueue
System.out.println("Collection added: " + response);
// Displaying the existing ConcurrentLinkedQueue
System.out.println("ConcurrentLinkedQueue: " + queue);
}
}
Producción:
ConcurrentLinkedQueue: [Aman, Amar] Collection to be added: [Sanjeet, Rabi, Debasis, Raunak, Mahesh] Collection added: true ConcurrentLinkedQueue: [Aman, Amar, Sanjeet, Rabi, Debasis, Raunak, Mahesh]
Ejemplo 3: Mostrar NullPointerException
// Java Program Demonstrate addAll()
// method of ConcurrentLinkedQueue
import java.util.concurrent.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create an ConcurrentLinkedQueue
ConcurrentLinkedQueue<String>
queue = new ConcurrentLinkedQueue<String>();
// Add String to queue
queue.add("Aman");
queue.add("Amar");
// create a ArrayList which is equal to null
ArrayList<String> arraylist = null;
// Displaying the existing ConcurrentLinkedQueue
System.out.println("ConcurrentLinkedQueue: " + queue);
// Displaying the existing Collection
System.out.println("Collection to be added: " + arraylist);
try {
// apply addAll() method and pass the arraylist as parameter
// since the arraylist is null, exception will be thrown
boolean response = queue.addAll(arraylist);
}
catch (NullPointerException e) {
System.out.println("Exception thrown while adding null: " + e);
}
}
}
Producción:
ConcurrentLinkedQueue: [Aman, Amar] Collection to be added: null Exception thrown while adding null: java.lang.NullPointerException
Ejemplo 4: Mostrando IllegalArgumentException
// Java Program Demonstrate addAll()
// method of ConcurrentLinkedQueue
import java.util.concurrent.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create an ConcurrentLinkedQueue
ConcurrentLinkedQueue<String>
queue = new ConcurrentLinkedQueue<String>();
// Add String to queue
queue.add("Aman");
queue.add("Amar");
// Displaying the existing ConcurrentLinkedQueue
System.out.println("ConcurrentLinkedQueue: " + queue);
try {
// apply addAll() method and passed the queue as parameter
boolean response = queue.addAll(queue);
}
catch (IllegalArgumentException e) {
System.out.println("Exception thrown while adding queue"
+ " to itself when collection is required: " + e);
}
}
}
Producción:
ConcurrentLinkedQueue: [Aman, Amar] Exception thrown while adding queue to itself when collection is required: java.lang.IllegalArgumentException
Publicación traducida automáticamente
Artículo escrito por AmanSingh2210 y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA