Requisito previo: ConcurrentHashmap Java
método clear()
El método java.util.concurrentHashMap.clear() se utiliza para borrar la asignación. Se utiliza para eliminar la asignación de ConcurrentHashMap.
Sintaxis:
public void clear()
// Java program to demonstrate
// clear() method
import java.util.concurrent.ConcurrentHashMap;
import java.util.*;
public class ConcurrentHashMapExample {
public static void main(String[] args)
{
// Creating a ConcurrentHashMap
Map<String, String> my_cmmap = new ConcurrentHashMap<String, String>();
// Inserting mappings in ConcurrentHashMap
// with the help of put() method
my_cmmap.put("1", "1");
my_cmmap.put("2", "1");
my_cmmap.put("3", "1");
my_cmmap.put("4", "1");
my_cmmap.put("5", "1");
my_cmmap.put("6", "1");
// Print the ConcurrentHashMap
System.out.println("Map before use of clear(): \n"
+ my_cmmap);
// Now clear the map using clear()
my_cmmap.clear();
// Print the clea Map
System.out.println("Map after use of clear(): "
+ my_cmmap);
}
}
Producción:
Map before use of clear():
{1=1, 2=1, 3=1, 4=1, 5=1, 6=1}
Map after use of clear(): {}
Ejemplo 2:
// Java program to demonstrate
// clear() method
import java.util.concurrent.ConcurrentHashMap;
import java.util.*;
public class ConcurrentHashMapExample {
public static void main(String[] args)
{
// Creating a ConcurrentHashMap
Map<String, String> my_map = new ConcurrentHashMap<String, String>();
// Inserting mappings in ConcurrentHashMap
// with the help of put() method
my_map.put("Geeks", "100");
my_map.put("Geek2", "150");
my_map.put("Geeks3", "120");
my_map.put("Geek4", "111");
my_map.put("Geek5", "110");
my_map.put("Geek6", "100");
// Print the ConcurrentHashMap
System.out.println("Map before use of clear(): \n"
+ my_map);
// Now clear the map using clear()
my_map.clear();
// Print the cleared Map
System.out.println("Map after use of clear(): "
+ my_map);
}
}
Producción:
Map before use of clear():
{Geeks3=120, Geek6=100, Geek5=110, Geek4=111, Geeks=100, Geek2=150}
Map after use of clear(): {}