基础练习 字母图形

import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        QUE q = new QUE();
        Scanner sc = new Scanner(System.in);
        int a=sc.nextInt(), b=sc.nextInt();

        q.show(b);

        for(int i = 1; i < a; i++){
            char hed = (char)(('A'+i%26));
            q.headin(hed);
            q.show(b);
        }

    }
}

class QUE{
    char[] a = new char[26];
    public QUE(){
        for(int i = 0; i < 26; i++){
            a[i] = (char)('A'+i);
        }
    }

    public void show(int n){
        for (int i = 0; i < n; i++){
            System.out.print(a[i]);
        }
        System.out.println();
    }
    public void headin(char x){

        for(int i = 25; i >0; i--){
            a[i] = a[i-1];
        }
        a[0]=x;
    }
}