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我们在处理数据的时候经常会需要进行排序后再返回给前端调用，比如按照时间升序排序，前端展示数据就是按时间先后进行排序。 这里可以运用stream的
sorted()方法来进行自定义的排序
用法
这里举例数据是一个list集合，List<Data>list，Data实体类中有许多属性，其中有时间字段，month
月份，那我们用stream().sorted()方法排序时，因为元素是类引用类型，需要自定义一个比较器Comparator，按month月份进行升序排序。代码如下。
list.stream().sorted(Comparator.comparing(o->new
Integer(o.getMonth()))).collect(Collectors.toList());
注意：这里比较器里面参数用了Lambda 表达式，new Integer(o.getMonth())
，这种封装成Integer类型的是因为我们设计的Data实体类中的month属性是String类型，并非Integer，转换成Integer是为了后续做月份遍历判断，如果属性是Integer
Month，则可以比较器中可以直接定义类的方法引用 如下：
list.stream().sorted(Comparator.comparing(Data::getMonth).collect(Collectors.toList());
