import java.util.HashMap;
import java.util.Map;
public class MapExample {
public static void main(String[] args) {
Map<String, Integer> map = new HashMap<>();
map.put("John", 25);
map.put("Alice", 30);
map.put("Bob", 20);
int johnAge = map.get("John");
System.out.println("John's age is " + johnAge);
map.remove("Alice");
for (Map.Entry<String, Integer> entry : map.entrySet()) {
String name = entry.getKey();
int age = entry.getValue();
System.out.println(name + " is " + age + " years old.");
}
}
}
