问题描述：

请老师检查：

相关代码：

​package com.imooc.sleep;
class Letter implements Runnable{
    char[] letter;
    public Letter(){
        letter = new char[26];
        char i = 'a';
        int b = 0;
        while ( b < 26){
            letter[b] = i;
            b++;
            i++;
        }
    }
    @Override
    public void run() {
        for (int i = 0; i <letter.length ; i++) {
            System.out.print(letter[i]);
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}
public class LetterTest {
    public static void main(String[] args) {
        Letter letter = new Letter();
        Thread thread = new Thread(letter);
        thread.start();
    }
}