Date 案例

    package TestDate;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
/*      准备一个长度是9的日期数组
        使用1970年-2000年之间的随机日期初始化该数组
        按照这些日期的时间进行升序排序
        比如 1988-1-21 12:33:22 就会排在 1978-4-21 19:07:23 前面，
        因为它的时间更小，虽然日期更大*/
public class Test02 {
    public static void main(String[] args)throws ParseException {
        Date[] dates = new Date[9];
        /*SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy");
        String str = "1970";
        Date d1 = simpleDateFormat.parse(str);
        Date d2 = simpleDateFormat.parse("2000");
        System.out.println(d2.getTime() - d1.getTime()); // 946684800000*/
        getRandomDates(dates);
        System.out.println("结果：");
        for (Date d:dates) {
            System.out.println(d.toLocaleString()+" ");
        }
        sortDates(dates);
        System.out.println("排序：");
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm");
        for (Date d:dates
             ) {
            System.out.println(simpleDateFormat.format(d));
        }
    }
        public  static void sortDates(Date [] dates){
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("HHmm");
            String[] strings = new String[dates.length];
            Date tmp;
            int[] ints = new int[dates.length];
            for (int i = 0; i < dates.length; i++) {
                strings[i] = simpleDateFormat.format(dates[i]);
                ints[i] = Integer.parseInt(strings[i]);
            }
            int tmpInt = 0;
            for(int i = 0;i < dates.length - 1;i++){
                for (int j = 0; j <dates.length - i -1 ;j++) {
                    if(ints[j] <ints[j+1]){
                        tmpInt = ints[j];
                        ints[j] = ints[j+1];
                        ints[j+1] = tmpInt;

                        tmp = dates[j];
                        dates[j] = dates[j+1];
                        dates[j+1] = tmp;
                    }
                }
            }
        }
        public static void getRandomDates(Date[] dates)throws ParseException{
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm");
            String str = "2000/12/31 23:59";
            Date endDate = simpleDateFormat.parse(str);
            for (int i = 0; i < dates.length; i++) {
                long tmp_Time = (long) (Math.random() * (endDate.getTime()));
                dates[i] = new Date(tmp_Time);
            }
        }
}



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