El método clear() de CopyOnWriteArraySet borra todos los elementos del Conjunto. El tamaño del conjunto se convierte en cero después de llamar a la función.
Sintaxis:
public void clear()
Valor devuelto: la función no devuelve nada.
Los siguientes programas ilustran la función anterior:
Programa 1:
// Java Program to illustrate the CopyOnWriteArraySet
// clear() method in Java
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(98);
// print CopyOnWriteArraySet
System.out.println("CopyOnWriteArraySet: "
+ ArrSet);
// Clear the CopyOnWriteArraySet
// Using clear() method
ArrSet.clear();
System.out.println("\nCopyOnWriteArraySet cleared\n");
// Print the updated CopyOnWriteArraySet
System.out.println("Updated CopyOnWriteArraySet: "
+ ArrSet);
}
}
Producción:
CopyOnWriteArraySet: [32, 67, 98] CopyOnWriteArraySet cleared Updated CopyOnWriteArraySet: []
Programa 2:
// Java Program to illustrate the CopyOnWriteArraySet
// clear() method in Java
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>();
// Add elements
ArrSet.add("gopal");
ArrSet.add("gfg");
ArrSet.add("jgec");
ArrSet.add("jgec");
// print CopyOnWriteArraySet
System.out.println("CopyOnWriteArraySet: "
+ ArrSet);
// Clear the CopyOnWriteArraySet
// Using clear() method
ArrSet.clear();
System.out.println("\nCopyOnWriteArraySet cleared\n");
// Print the updated CopyOnWriteArraySet
System.out.println("Updated CopyOnWriteArraySet: "
+ ArrSet);
}
}
Producción:
CopyOnWriteArraySet: [gopal, gfg, jgec] CopyOnWriteArraySet cleared Updated CopyOnWriteArraySet: []
Referencia: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArraySet.html#clear–