最初設想使用：時間long型

private void testTimes() throws InterruptedException{Calendar cal=Calendar.getInstance();cal.add(Calendar.DATE, 1);cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH), 0, 0, 0);Long time1=cal.getTimeInMillis();Calendar ca2=Calendar.getInstance();ca2.add(Calendar.DATE, 1);ca2.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH), 0, 0, 0);Long time2=ca2.getTimeInMillis();System.out.println(time1+"--"+time2);}

發現整型可能不一致，即有時候一致，有時候不一致。

經測算發現，Collections提供了排序功能：

private void testSort(){List<Calendar> cals=new ArrayList<Calendar>();Calendar cal3=Calendar.getInstance();cal3.add(Calendar.DATE, 2);cal3.set(cal3.get(Calendar.YEAR), cal3.get(Calendar.MONTH), cal3.get(Calendar.DAY_OF_MONTH), 0, 0, 0);Calendar cal4=Calendar.getInstance();cal4.add(Calendar.DATE, 2);cal4.set(cal4.get(Calendar.YEAR), cal4.get(Calendar.MONTH), cal4.get(Calendar.DAY_OF_MONTH), 0, 0, 0);Calendar cal1=Calendar.getInstance();cal1.add(Calendar.DATE, 2);cal1.set(cal1.get(Calendar.YEAR), cal1.get(Calendar.MONTH), cal1.get(Calendar.DAY_OF_MONTH), 0, 0, 2);Calendar cal2=Calendar.getInstance();cal2.add(Calendar.DATE, 2);cal2.set(cal2.get(Calendar.YEAR), cal2.get(Calendar.MONTH), cal2.get(Calendar.DAY_OF_MONTH), 0, 0, 0);cals.add(cal3);cals.add(cal4);cals.add(cal1);cals.add(cal2);Calendar minTime=Collections.min(cals);System.out.println(DateUtils.formatDate(Collections.min(cals).getTime(),"yyyy-MM-dd HH:mm:ss"));for(int i=0;i<cals.size();i++){if(DateUtils.defaultFormatDate(minTime.getTime()).equals(DateUtils.defaultFormatDate(cals.get(i).getTime()))){System.out.println(DateUtils.formatDate(cals.get(i).getTime(),"yyyy-MM-dd HH:mm:ss"));}}/* for(int i=0;i<cals.size();i++){System.out.println(DateUtils.formatDate(cals.get(i).getTime(),"yyyy-MM-dd HH:mm:ss"));}Collections.sort(cals);//排序后for(int i=0;i<cals.size();i++){System.out.println(DateUtils.formatDate(cals.get(i).getTime(),"yyyy-MM-dd HH:mm:ss"));}*/}

?

轉載于:https://www.cnblogs.com/davidwang456/p/5782054.html

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