相关代码：

class Letter implements Runnable {
	char[] letter = new char[26];

	public Letter() {
		for (int i = 0; i <= 25; i++) {
			letter[i] = (char) (i + 97);
		}
	}

	public void run() {
		for (int i = 0; i < 26; i++) {
			System.out.print(letter[i]);
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
}

public class Test {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Letter letter = new Letter();
		Thread one = new Thread(letter);
		one.start();
	}

}