第一?/p>
实验一
package ch01;
import java.text.SimpleDateFormat;
import java.util.Date;
class Timer extends Thread {
private SimpleDateFormat sdf = new SimpleDateFormat("yyyy
?/p>
MM
?/p>
dd
?/p>
HH:mm:ss");
public void run() {
while (true) {
System.out.print("\r
现在时间是:
");
Date now = new Date();
System.out.print(sdf.format(now));
try {