代码如下，可根据需求衍生出各种格式的输出和使用package test;import java.util.ArrayList;import java.util.List;public class Folder ...{public Folder(String title) ...{this.title = title;}private String title;private List<Folder> children = new ArrayList<Folder>();public void addChild(Folder f) ...{children.add(f);}public List<Folder> getChildren() ...{return children;}public void setChildren(List<Folder> children) ...{this.children = children;}public String getTitle() ...{return title;}public void setTitle(String title) ...{this.title = title;}publi...