Letter

package com.lding.thread;

public class Letter implements Runnable{
    @Override
    public void run() {
        for(int i=0;i<26;i++){
            System.out.print((char)('a'+i));
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

LetterTest

​package com.lding.thread;

public class LetterTest {
    public static void main(String[] args) {
        Letter one= new Letter();
        Thread mt=new Thread(one);
        mt.start();
    }
}