java中的list时间排序

发布时间：2020-12-14 06:21:42 所属栏目：Java 来源：网络整理

导读：最初设想使用：时间long型 testTimes() = 1 0,0 = Calendar ca2/span=span style="color: #000000;"gt;Calendar.getInstance(); ca2.add(Calendar.DATE,/span1span style="color: #000000;"gt;); ca2.set(cal.get(Calendar.YEAR),0span style="color: #00000

最初设想使用：时间long型

testTimes() =10,0=

    Calendar ca2</span>=<span style="color: #000000;"&gt;Calendar.getInstance();
    ca2.add(Calendar.DATE,</span>1<span style="color: #000000;"&gt;);
    ca2.set(cal.get(Calendar.YEAR),0<span style="color: #000000;"&gt;);

    Long time2</span>=<span style="color: #000000;"&gt;ca2.getTimeInMillis();

    System.out.println(time1</span>+"--"+<span style="color: #000000;"&gt;time2);
}</span></pre>

发现整型可能不一致，即有时候一致，有时候不一致。

经测算发现，Collections提供了排序功能：

cals= ArrayList

    Calendar cal3</span>=<span style="color: #000000;"&gt;Calendar.getInstance();
    cal3.add(Calendar.DATE,</span>2<span style="color: #000000;"&gt;);
    cal3.set(cal3.get(Calendar.YEAR),cal3.get(Calendar.MONTH),cal3.get(Calendar.DAY_OF_MONTH),0<span style="color: #000000;"&gt;);

    Calendar cal4</span>=<span style="color: #000000;"&gt;Calendar.getInstance();
    cal4.add(Calendar.DATE,</span>2<span style="color: #000000;"&gt;);
    cal4.set(cal4.get(Calendar.YEAR),cal4.get(Calendar.MONTH),cal4.get(Calendar.DAY_OF_MONTH),0<span style="color: #000000;"&gt;);

    Calendar cal1</span>=<span style="color: #000000;"&gt;Calendar.getInstance();
    cal1.add(Calendar.DATE,</span>2<span style="color: #000000;"&gt;);
    cal1.set(cal1.get(Calendar.YEAR),cal1.get(Calendar.MONTH),cal1.get(Calendar.DAY_OF_MONTH),2<span style="color: #000000;"&gt;);

    Calendar cal2</span>=<span style="color: #000000;"&gt;Calendar.getInstance();
    cal2.add(Calendar.DATE,</span>2<span style="color: #000000;"&gt;);
    cal2.set(cal2.get(Calendar.YEAR),cal2.get(Calendar.MONTH),cal2.get(Calendar.DAY_OF_MONTH),0<span style="color: #000000;"&gt;);

    cals.add(cal3);
    cals.add(cal4);
    cals.add(cal1);
    cals.add(cal2);

    Calendar minTime</span>=<span style="color: #000000;"&gt;Collections.min(cals);

    System.out.println(DateUtils.formatDate(Collections.min(cals).getTime(),</span>"yyyy-MM-dd HH:mm:ss"<span style="color: #000000;"&gt;));


    </span><span style="color: #0000ff;"&gt;for</span>(<span style="color: #0000ff;"&gt;int</span> i=0;i<cals.size();i++<span style="color: #000000;"&gt;){
        </span><span style="color: #0000ff;"&gt;if</span><span style="color: #000000;"&gt;(DateUtils.defaultFormatDate(minTime.getTime()).equals(DateUtils.defaultFormatDate(cals.get(i).getTime()))){
            System.out.println(DateUtils.formatDate(cals.get(i).getTime(),</span>"yyyy-MM-dd HH:mm:ss"<span style="color: #000000;"&gt;));
        }
    }
    </span><span style="color: #008000;"&gt;/*</span><span style="color: #008000;"&gt;        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"));
    }</span><span style="color: #008000;"&gt;*/</span><span style="color: #000000;"&gt;
}</span></pre>

（编辑：李大同）

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