import java.util.HashMap;
import java.util.Map;

public class HashMapExample {
    public static void main(String[] args) {
        HashMap<Integer, String> employeeMap = new HashMap<>();

// Adding key-value pairs
        employeeMap.put(1, "Alice");
        employeeMap.put(2, "Bob");
        employeeMap.put(3, "Charlie");

// Access and modify
        System.out.println("Employee 2: " + employeeMap.get(2));
        employeeMap.put(2, "Bobby");

// Iterating using entrySet
        for (Map.Entry<Integer, String> entry : employeeMap.entrySet()) {
            System.out.println(entry.getKey() + " -> " + entry.getValue());
        }

// Removing an entry
        employeeMap.remove(3);

// Check contents
        System.out.println("Has key 1? " + employeeMap.containsKey(1));
        System.out.println("Has value 'Charlie'? " + employeeMap.containsValue("Charlie"));

// Clear the map
        employeeMap.clear();
        System.out.println("Is map empty? " + employeeMap.isEmpty());
    }
}