现在有两组数据集合list
public class DataEntity{
private Long id;
private String name;
private Double value;
private Date date;
.....
}
一组为:
+----+----------+-------+------------+
| id | name | value1| date |
+----+----------+-------+------------+
| 1 | 北京大厦 | 12 | 2009-09-01 |
| 2 | 北京大厦 | 10 | 2009-09-02 |
| 3 | 北京大厦 | 11 | 2009-09-03 |
| 4 | 北京大厦 | 14 | 2009-09-04 |
| 13 | 南京大厦 | 14 | 2009-09-01 |
| 14 | 南京大厦 | 16 | 2009-09-02 |
| 15 | 南京大厦 | 18 | 2009-09-03 |
| 16 | 南京大厦 | 10 | 2009-09-04 |
另一组为:
+----+----------+-------+------------+
| id | name | value2| date |
+----+----------+-------+------------+
| 1 | 北京大厦 | 13 | 2009-09-01 |
| 2 | 北京大厦 | 12 | 2009-09-02 |
| 3 | 北京大厦 | 14 | 2009-09-03 |
| 4 | 北京大厦 | 11 | 2009-09-04 |
| 13 | 南京大厦 | 14 | 2009-09-01 |
| 14 | 南京大厦 | 15 | 2009-09-02 |
| 15 | 南京大厦 | 17 | 2009-09-03 |
| 16 | 南京大厦 | 10 | 2009-09-04 |
写一个方法按照时间对应关系得到
+----+----------+-------+------------+
| id | name |value1/value2| date |
+----+----------+-------+------------+
| 1 | 北京大厦 | 12/13 | 2009-09-01 |
| 2 | 北京大厦 | 10/11 | 2009-09-02 |
| 3 | 北京大厦 | 11/14 | 2009-09-03 |
| 4 | 北京大厦 | 14/11 | 2009-09-04 |
| 13 | 南京大厦 | 14/14 | 2009-09-01 |
| 14 | 南京大厦 | 16/15 | 2009-09-02 |
| 15 | 南京大厦 | 18/17 | 2009-09-03 |
| 16 | 南京大厦 | 10/10 | 2009-09-04 |
急用,请大家多帮忙,非常感谢!!!