Java Hashmap Key существует
// Java code to illustrate the containsKey() method
import java.util.*;
public class Hash_Map_Demo {
public static void main(String[] args)
{
// Creating an empty HashMap
HashMap<Integer, String> hash_map = new HashMap<Integer, String>();
// Mapping string values to int keys
hash_map.put(10, "Geeks");
hash_map.put(15, "4");
hash_map.put(20, "Geeks");
hash_map.put(25, "Welcomes");
hash_map.put(30, "You");
// Displaying the HashMap
System.out.println("Initial Mappings are: " + hash_map);
// Checking for the key_element '20'
System.out.println("Is the key '20' present? " +
hash_map.containsKey(20));
// Checking for the key_element '5'
System.out.println("Is the key '5' present? " +
hash_map.containsKey(5));
}
}
Angry Albatross
