Java计时器接口

/**
 *作者：魏宝航
 *2020年11月23日,下午23:10
 */
package 测试;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Times {
  private static final SimpleDateFormat fmt = new SimpleDateFormat("HH:mm:ss.SSS");
  public interface Task {
    void execute();
  }
  public static void test(String title, Task task) {
    if (task == null) return;
    title = (title == null) ? "" : ("【" + title + "】");
    System.out.println(title);
    System.out.println("开始：" + fmt.format(new Date()));
    long begin = System.currentTimeMillis();
    task.execute();
    long end = System.currentTimeMillis();
    System.out.println("结束：" + fmt.format(new Date()));
    double delta = (end - begin) / 1000.0;
    System.out.println("耗时：" + delta + "秒");
    System.out.println("-------------------------------------");
  }
}