Input
Output
import java.util.Map; public class HashtableExample { public static void main(String[] args) { Hashtable<Integer, String> employees = new Hashtable<>(); // Adding key-value pairs employees.put(100, "Alice"); employees.put(101, "Bob"); employees.put(102, "Charlie"); // Display all entries for (Map.Entry<Integer, String> entry : employees.entrySet()) { System.out.println("ID: " + entry.getKey() + ", Name: " + entry.getValue()); } // Update and remove employees.put(101, "Bobby"); employees.remove(100); // Check contains System.out.println("Has key 102? " + employees.containsKey(102)); System.out.println("Has value 'Charlie'? " + employees.containsValue("Charlie")); // Size System.out.println("Size: " + employees.size()); } }