Método CopyOnWriteArraySet isEmpty() en Java

El método isEmpty(E e) de CopyOnWriteArraySet comprueba si el conjunto está vacío o no. Devuelve verdadero si el conjunto está vacío, de lo contrario devuelve falso.

Sintaxis:  

public boolean isEmpty()

Valor devuelto: la función devuelve verdadero si el conjunto está vacío; de lo contrario, devuelve falso.

Los siguientes programas ilustran la función anterior:

Programa 1:  

// Java Program to illustrate the
// isEmpty() method in CopyOnWriteArraySet
 
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.*;
 
public class GFG {
    public static void main(String[] args)
    {
 
        // create object of CopyOnWriteArraySet
        CopyOnWriteArraySet<Integer> ArrSet
            = new CopyOnWriteArraySet<Integer>();
 
        // Add elements
        ArrSet.add(32);
        ArrSet.add(67);
        ArrSet.add(98);
        ArrSet.add(100);
 
        // print CopyOnWriteArraySet
        System.out.println("CopyOnWriteArraySet: " + ArrSet);
 
        // check using function
        if (ArrSet.isEmpty())
            System.out.println("\nSet is empty");
        else
            System.out.println("\nSet is not empty");
    }
}

CopyOnWriteArraySet: [32, 67, 98, 100]

Set is not empty

Programa 2:  

// Java Program to illustrate the
// isEmpty() method in CopyOnWriteArraySet
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.*;
 
public class GFG {
    public static void main(String[] args)
    {
 
        // create object of CopyOnWriteArraySet
        CopyOnWriteArraySet<String> ArrSet
            = new CopyOnWriteArraySet<String>();
 
        // print CopyOnWriteArraySet
        System.out.println("CopyOnWriteArraySet: "
                           + ArrSet);
 
        // check using function
        if (ArrSet.isEmpty())
            System.out.println("\nSet is empty");
        else
            System.out.println("\nSet is not empty");
    }
}

CopyOnWriteArraySet: []

Set is empty

Referencia: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArraySet.html#isEmpty–