用JAVA实现文本形式的树状结构显示代码

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 children = new ArrayList();

public void addChild(Folder f) {
children.add(f);
}

public List getChildren() {
return children;
}

public void setChildren(List children) {
this.children = children;
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public String toString(String lftStr, String append) {
StringBuilder b = new StringBuilder();
b.append(append + title);
b.append("\n");
if (children.size() > 0) {
for (int i = 0; i < children.size() - 1; i++) {
b.append(lftStr+children.get(i).toString(lftStr + "│", "├"));
}
b.append(lftStr + children.get(children.size() - 1).toString(
lftStr + " ", "└"));

}
return b.toString();

}

public static void main(String[] args) {
Folder root = new Folder("菜单列表");
Folder f1 = new Folder("开始菜单");
root.addChild(f1);
Folder f1_1 = new Folder("程序");
f1.addChild(f1_1);
Folder f1_1_1 = new Folder("附件");
f1_1.addChild(f1_1_1);
Folder f1_1_1_1 = new Folder("娱乐");
f1_1_1.addChild(f1_1_1_1);
Folder f1_1_1_2 = new Folder("娱乐2");
f1_1_1.addChild(f1_1_1_2);
Folder f1_2 = new Folder("辅助工具");
f1.addChild(f1_2);
Folder f2 = new Folder("My Documents ");
root.addChild(f2);
Folder f3 = new Folder("My Documents2 ");
root.addChild(f3);

System.out.println(root.toString(" ", ""));
}
}

运行结果如下：

菜单列表
├开始菜单
│├程序
││└附件
││ ├娱乐
││ └娱乐2
│└辅助工具
├My Documents
└My Documents2