Question

java 怎么获取一天的开始时间和结束时间

Answer 1

 Date date=new Date();//取时间
     date.clearTime()
     Calendar calendar = new GregorianCalendar();
     calendar.setTime(date);
     calendar.set(Calendar.HOUR,0)
     calendar.set(Calendar.MINUTE,0)
     calendar.set(Calendar.SECOND,0)
     calendar.set(Calendar.MILLISECOND,0)
     System.out.println("开始时间："+calendar.getTime())
     calendar.set(Calendar.HOUR,23)
     calendar.set(Calendar.MINUTE,59)
     calendar.set(Calendar.SECOND,59)
     calendar.set(Calendar.MILLISECOND,999)
     System.out.println("结束时间："+calendar.getTime())

 可以利用以上代码来实现这个功能