Java Set是否包含某元素

import java.util.HashSet;
import java.util.Set;

public class Main {
    public static void main(String[] args) {
        Set<String> mySet = new HashSet<>();
        mySet.add("apple");
        mySet.add("banana");
        mySet.add("orange");

        String elementToFind = "banana";
        boolean isElementInSet = mySet.contains(elementToFind);

        if (isElementInSet) {
            System.out.println(elementToFind + " is in the set.");
        } else {
            System.out.println(elementToFind + " is not in the set.");
        }
    }
}