Java List双重排序法

//按专业名称+班级名称排序
result.sort((o1, o2) -> {
if (o1.getStr("zhuanye_name").equals(o2.getStr("zhuanye_name"))) {
return 0 - o2.getStr("class_name").compareTo(o1.getStr("class_name"));
} else {
return o1.getStr("zhuanye_name").compareTo(o2.getStr("zhuanye_name"));
}
});