El método remove() de Queue Interface devuelve y elimina el elemento al frente del contenedor. Elimina la cabecera del contenedor. El método lanza una excepción NoSuchElementException cuando la cola está vacía.
Sintaxis:
E remove()
Devoluciones: este método devuelve la cabeza de la cola.
Excepción: la función lanza una excepción NoSuchElementException cuando la cola está vacía.
Los siguientes programas ilustran el método remove() de Queue:
Programa 1: Con la ayuda de LinkedList .
// Java Program Demonstrate remove()
// method of Queue
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of Queue
Queue<Integer> Q
= new LinkedList<Integer>();
// Add numbers to end of Queue
Q.add(7855642);
Q.add(35658786);
Q.add(5278367);
Q.add(74381793);
// print queue
System.out.println("Queue: " + Q);
// print head and deletes the head
System.out.println("Queue's head: " + Q.remove());
// print head and deleted the head
System.out.println("Queue's head: " + Q.remove());
}
}
Producción:
Queue: [7855642, 35658786, 5278367, 74381793] Queue's head: 7855642 Queue's head: 35658786
Programa 2: Con la ayuda de ArrayDeque .
// Java Program Demonstrate remove()
// method of Queue
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of Queue
Queue<Integer> Q
= new ArrayDeque<Integer>();
// Add numbers to end of Queue
Q.add(7855642);
Q.add(35658786);
Q.add(5278367);
Q.add(74381793);
// print queue
System.out.println("Queue: " + Q);
// print head and deletes the head
System.out.println("Queue's head: " + Q.remove());
// print head and deleted the head
System.out.println("Queue's head: " + Q.remove());
}
}
Producción:
Queue: [7855642, 35658786, 5278367, 74381793] Queue's head: 7855642 Queue's head: 35658786
Programa 3: Con la ayuda de LinkedBlockingDeque .
// Java Program Demonstrate remove()
// method of Queue
import java.util.*;
import java.util.concurrent.LinkedBlockingDeque;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of Queue
Queue<Integer> Q
= new LinkedBlockingDeque<Integer>();
// Add numbers to end of Queue
Q.add(7855642);
Q.add(35658786);
Q.add(5278367);
Q.add(74381793);
// print queue
System.out.println("Queue: " + Q);
// print head and deletes the head
System.out.println("Queue's head: " + Q.remove());
// print head and deleted the head
System.out.println("Queue's head: " + Q.remove());
}
}
Producción:
Queue: [7855642, 35658786, 5278367, 74381793] Queue's head: 7855642 Queue's head: 35658786
Programa 4: Con la ayuda de ConcurrentLinkedDeque .
// Java Program Demonstrate remove()
// method of Queue
import java.util.*;
import java.util.concurrent.ConcurrentLinkedDeque;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of Queue
Queue<Integer> Q
= new ConcurrentLinkedDeque<Integer>();
// Add numbers to end of Queue
Q.add(7855642);
Q.add(35658786);
Q.add(5278367);
Q.add(74381793);
// print queue
System.out.println("Queue: " + Q);
// print head and deletes the head
System.out.println("Queue's head: " + Q.remove());
// print head and deleted the head
System.out.println("Queue's head: " + Q.remove());
}
}
Producción:
Queue: [7855642, 35658786, 5278367, 74381793] Queue's head: 7855642 Queue's head: 35658786
Los siguientes programas ilustran las excepciones lanzadas por este método :
Programa 5: Para mostrar NoSuchElementException .
// Java Program Demonstrate remove()
// method of Queue
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of Queue
Queue<Integer> Q
= new LinkedList<Integer>();
// Add numbers to end of Queue
Q.add(423);
Q.add(3432);
// print queue
System.out.println("Queue: " + Q);
// print head and deletes the head
System.out.println("Queue's head: " + Q.remove());
// print head and deleted the head
System.out.println("Queue's head: " + Q.remove());
// print queue
System.out.println("Queue: " + Q);
try {
// Queue is empty now hence exception
System.out.println("Queue's head: " + Q.element());
}
catch (Exception e) {
System.out.println("Exception: " + e);
}
}
}
Producción:
Queue: [423, 3432] Queue's head: 423 Queue's head: 3432 Queue: [] Exception: java.util.NoSuchElementException
Referencia: https://docs.oracle.com/javase/8/docs/api/java/util/Queue.html#remove–