如何在不获取其他字符的情况下获得第六和第七的大写或小写字母？(这个问题是给初学者的，所以我不能用if命令或任何高级的东西)

import java.util.Random;

public class RandomPasswordGenerator
{
    public static void main(String[] args)
    {
        Random generator = new Random();

        int First = generator.nextInt(26)+97;
        int Second = generator.nextInt(26)+97;
        int Third = generator.nextInt(10);
        int Fourth = generator.nextInt(26)+65;
        int Fifth = generator.nextInt(26)+65;
        int Sixth = generator.nextInt(58)+65;
        int Seventh = generator.nextInt(58)+65;

        System.out.print((char) First);
        System.out.print((char) Second);
        System.out.print((char) Third);
        System.out.print((char) Fourth);
        System.out.print((char) Fifth);
        System.out.print((char) Sixth);
        System.out.println((char) Seventh);
    }
}