El método remove() de AbstractQueue devuelve y elimina la cabeza de esta cola.
Sintaxis:
public E remove()
Parámetros: este método no acepta ningún parámetro.
Devoluciones: el método devuelve la cabeza de la cola.
Excepción: la función lanza una NoSuchElementException si la cola está vacía.
Los siguientes programas ilustran el método remove() :
Programa 1:
// Java program to illustrate the
// AbstractQueue remove() method
import java.util.*;
import java.util.concurrent.LinkedBlockingQueue;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
// Creating object of AbstractQueue<Integer>
AbstractQueue<Integer>
AQ1 = new LinkedBlockingQueue<Integer>();
// Populating AQ1
AQ1.add(10);
AQ1.add(20);
AQ1.add(30);
AQ1.add(40);
AQ1.add(50);
// print AQ
System.out.println("AbstractQueue1 contains : " + AQ1);
// retrieves the head
int head = AQ1.remove();
System.out.println("head : " + head);
// print AQ
System.out.println("AbstractQueue1 after removal of head : " + AQ1);
}
}
Producción:
AbstractQueue1 contains : [10, 20, 30, 40, 50] head : 10 AbstractQueue1 after removal of head : [20, 30, 40, 50]
Programa 2:
// Java program to illustrate the
// AbstractQueue element() method
// NoSuchElementException
// Java program to illustrate the
// AbstractQueue remove() method
import java.util.*;
import java.util.concurrent.LinkedBlockingQueue;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
// Creating object of AbstractQueue<Integer>
AbstractQueue<Integer>
AQ1 = new LinkedBlockingQueue<Integer>();
// Populating AQ1
AQ1.add(10);
// print AQ
System.out.println("AbstractQueue1 contains : " + AQ1);
// retrieves the head
int head = AQ1.remove();
System.out.println("head : " + head);
// retrieves the head again
head = AQ1.remove();
System.out.println("head : " + head);
}
catch (Exception e) {
System.out.println("Exception: " + e);
}
}
}
Producción:
AbstractQueue1 contains : [10] head : 10 Exception: java.util.NoSuchElementException
Referencia: https://docs.oracle.com/javase/8/docs/api/java/util/AbstractQueue.html#remove–