java 树状list转普通list

 
public static List treeToList(List list) {
    List result = new ArrayList<>();
    for(T test : list) {
        List c = test.getChildren();
        result.add(test);
        if (!CollectionUtils.isEmpty(c)) {
            result.addAll(treeToList(c));
            test.setChildren(null);
        }
    }
    return result;
}