问如何检查列表中的字母(Java)？

EN

package Hangman;
import java.util.Scanner;
import java.util.ArrayList;
import java.util.Random;
import java.util.*;

public class HangmanCode extends HangmanPictures {
    public static ArrayList<String> guessed = new ArrayList<String>();
    public static String[] words =  {"hello","goodbye","relax","amazing"};

    public static void main(String[] args) {
        String word = words[new Random().nextInt(words.length)];
        for(int i=0;i <= word.length();i++) {
            System.out.print("_ ");
        }
        int tries = 7;
        boolean gameOn = true;
        while(gameOn = true) {
            System.out.println("So lets start hangman!");
            System.out.println(pic1());
            System.out.println("Enter a letter");
            Scanner g = new Scanner(System.in);



        }

    }
}