获取树形结构

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private List<Division> makeTree(List<?> list, String parentId){
        //子类
        List<Division> children = list.stream().filter(x -> x.getParentId().equals(parentId)).collect(Collectors.toList());
        //非子类
        List<Division> successor = list.stream().filter(x -> !x.getParentId().equals(parentId)).collect(Collectors.toList());
        children.forEach(x->{
            makeTree(successor,x.getId()).forEach(
                    y->x.getChildrenList().add(y)
            );
        });
        return children;
    }