java - 创建引用父数组列表的方法

Question

所以我问了一个与此类似的问题，但我认为我得到的答案与我想要做的事情不符。

假设我有这门课:

Java 代码

public class Section
{
    private String sDocumentTitle;
    private String sHeadingTitle;
    private String sText;
    public ArrayList<Section> aSiblingSection = new ArrayList<Section>();
    public ArrayList<Section> aChildSection = new ArrayList<Section>();
    public ArrayList<image> aImages = new ArrayList<image>();

    public void setName(String docTitle)
    {
        //set passed parameter as name
        sDocumentTitle = docTitle;
    }

    public void addName (String docTitle)
    {
        //adds remaining Title String together
        sDocumentTitle += (" " + docTitle);
    }

    public String getName()
    {
        //return the set name
        return sDocumentTitle;
    }

    public void setSection(String section)
    {
        //set passed parameter as name
        sHeadingTitle = section;
    }

    public void addSection(String section)
    {
        //adds section parts together
        sHeadingTitle += ("" + section);
    }

    public String getSection()
    {
        //return the set name
        return sHeadingTitle;
    }
    public void setText(String text)
    {
        //set passed parameter as name
        sText = text;
    }

    public void addText(String text)
    {
        //adds 
        sText += (" " + text);
    }

    public String getText()
    {
        //return the set name
        return sText;
    }
    public ArrayList getChildSection()
    {
        return aChildSection;
    }
}  

并且在驱动程序类中以这种方式初始化子部分......

Section aSection = new Section();
aMainSection.get(0).aChildSection.add(aSection);

本质上，有人可以告诉我如何在节类中添加一个方法，该方法从“aChildSection”的数组列表返回父项吗？

Answer 1

添加构造函数

private final Section parent;
public Section(Section parent) {
    this.parent = parent;
}

public Section getParent() {
    return parent;
}

当您添加 child 时

Section aSection = new Section(aMainSection.get(0));
aMainSection.get(0).aChildSection.add(aSection);