//需要排序的實體
@Data
public class SortDemo{
private String field;
}
//排序方法
public static void main(String[] args) {
List<SortDemo> list = new ArrayList<>();
list.add(new SortDemo("test75aa"));
list.add(new SortDemo("test80ccs"));
list.add(new SortDemo("test60nmsss"));
Set< SortDemo > set = new HashSet<>(list);
List<SortDemo> collect = set.stream()
.sorted(Comparator.comparingInt(a -> Integer.parseInt(a.field().substring(5, 7))))//這里截取方式自己去定義可能有不是兩位數的情況
.collect(Collectors.toList());
System.out.println(collect.toString());
}