java中将数据转为树结构

```
	//实体类中需要包含唯一id，pid和名称  此处不贴实体类
 	List<HrmDepartment> h1 = testService.queryDepApi();
  	//将department设置为部门树
    if (!h1.isEmpty()) {
    	for ( HrmDepartment p : h1 ) {
            // 子节点
    		HrmDepartment child = p;
    		if (ids.contains(p.getParentId())) {
            	allList.add(p);
            	continue;
            } else {
                for ( HrmDepartment innerPermission : h1 ) {
                    if ( child.getParentId() == innerPermission.getId()) {
						// 父节点
                    	HrmDepartment parent = innerPermission;
                        // 组合父子节点的关系
                        parent.getChildren().add(child);
                        break;
                    }
                }
            }
        }
	}