Main.java

package com.example;

import java.util.ArrayList;
import java.util.Comparator;

public class Main {

    public static void main(String[] args) {
        ArrayList<String> strings = new ArrayList<>();
        String result = strings.stream()
                .max(Comparator.comparing(String::length))
                .get();
        System.out.println(result);
    }
}