java - 如何使用递归获取 parent 及其 child 的所有 child

Question

refference.

在这里我想获取 parent 的所有 child 。这是我的Screen.

在此屏幕中，我想保存所有行。为此，我创建了以下 bean。

public class AdminComponentBean{

    List<MultiAdminComponent> componentListbean;
}

另一颗 bean :-

public class MultiAdminComponent {

    private String componentName;
    private String componentIdentification;
    private String componentType;
    private String componentState;
    private String componentUrl;
    private String rowId;
    private List<MultiAdminComponent> items;
    }

在我的服务中，我尝试找回所有的 child 。但我无法获得 parent 的 child 。

  List < MultiAdminComponent > adminComponentList = adminComponentBean.getComponentListbean();
       for (MultiAdminComponent adminComponentListBean: adminComponentList) {

          flag = BaseDAO.getAdminComponentDAOObject().saveParentComponentDetails(adminComponentListBean);//Here the parents will save but not the childs
          for (MultiAdminComponent adminComponentchild: adminComponentListBean.getItems()) {//here I am trying to save childs

          }
 }

Answer 1

您可以编写如下递归方法:

void addChildren(MultiAdminComponent parent, List<MultiAdminComponent> children) {
    if(null != parent.getItems()) {
        for(MultiAdminComponent child : parent.getItems()) {
            children.add(child);
            addChildren(child, children);
        }
    }
}

并用空列表调用它，例如:

MultiAdminComponent parent; //parent
List<MultiAdminComponent> children = new ArrayList<>();
addChildren(parent, children);

方法调用后，children列表应该包含所有子对象。