El método pollFirst() de java.util.concurrent.ConcurrentSkipListSet es una función integrada en Java que devuelve recupera y elimina el primer elemento (el más bajo), o devuelve un valor nulo si este conjunto está vacío.
Sintaxis:
public E pollFirst()
Valor devuelto: la función devuelve recupera y elimina el primer elemento (el más bajo), o devuelve un valor nulo si este conjunto está vacío.
Los siguientes programas ilustran el método ConcurrentSkipListSet.pollFirst():
Programa 1:
// Java program to demonstrate pollFirst()
// method of ConcurrentSkipListSet
import java.util.concurrent.*;
class ConcurrentSkipListSetpollFirstExample1 {
public static void main(String[] args)
{
// Creating a set object
ConcurrentSkipListSet<Integer>
Lset = new ConcurrentSkipListSet<Integer>();
// Adding elements to this set
for (int i = 10; i <= 50; i += 10)
Lset.add(i);
// Printing the content of the set
System.out.println("Contents of the set: " + Lset);
// Retrieving and removing first element of the set
System.out.println("The first element of the set: "
+ Lset.pollFirst());
// Printing the content of the set after pollFirst()
System.out.println("Contents of the set after pollFirst: "
+ Lset);
}
}
Producción:
Contents of the set: [10, 20, 30, 40, 50] The first element of the set: 10 Contents of the set after pollFirst: [20, 30, 40, 50]
Programa 2:
// Java program to demonstrate pollFirst()
// method of ConcurrentSkipListSet
import java.util.concurrent.*;
class ConcurrentSkipListSetpollFirstExample2 {
public static void main(String[] args)
{
// Creating a set object
ConcurrentSkipListSet<Integer>
Lset = new ConcurrentSkipListSet<Integer>();
// Printing the content of the set
System.out.println("Contents of the set: " + Lset);
// Retrieving and removing first element of the set
System.out.println("The first element of the set: "
+ Lset.pollFirst());
}
}
Producción:
Contents of the set: [] The first element of the set: null
Referencia:
https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#pollFirst–
Publicación traducida automáticamente
Artículo escrito por rupesh_rao y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA