import java.util.*;

public class CheckDuplicates {
    public static boolean hasDuplicates(List<String> stringList) {
        if (stringList == null || stringList.isEmpty()) return false;
        Set<String> stringSet = new HashSet<>();
        for (String str : stringList) {
            if (!stringSet.add(str)) {
                return true; // Duplicate found
            }
        }
        return false;
    }

    public static void main(String[] args) {
        List<String> stringList = Arrays.asList("apple", "banana", "cherry", "apple");
        System.out.println("Has Duplicates: " + hasDuplicates(stringList));
    }
}