java休眠

public class SleepDemo {
   public static void main(String args[]) {
      try {
         System.out.println(new Date( ) + "\n");
         Thread.sleep(1000*3);   // 休眠3秒
         System.out.println(new Date( ) + "\n");
      } catch (Exception e) {
          System.out.println("Got an exception!");
      }
   }
}