java List 根據某個欄位進行升降序排列
阿新 • • 發佈：2019-03-22
用法
List<Student> students = new ArrayList<Student>(); SortList<Student> sortList = new SortList<Student>(); sortList.Sort(students, "age", "desc");
/**
* ClassName: SortList
* Function: list升降排序專用
* Date: 2019-03-21 16:57
* author likaixuan
* version V1.0
*/
public class SortList<E> {
public void Sort(List<E> list, final String method, final String sort) {
Collections.sort(list, new Comparator() {
public int compare(Object a, Object b) {
int ret = 0;
try {
Method m1 = ((E) a).getClass().getMethod(method, null);
Method m2 = ((E) b).getClass().getMethod(method, null);
if (sort != null && "desc".equals(sort))// 倒序
ret = m2.invoke(((E) b), null).toString()
.compareTo(m1.invoke(((E) a), null).toString());
else
// 正序
ret = m1.invoke(((E) a), null).toString()
.compareTo(m2.invoke(((E) b), null).toString());
} catch (NoSuchMethodException ne) {
} catch (IllegalAccessException ie) {
} catch (InvocationTargetException it) {
}
return ret;
}
});
}
}