用java實現文本形式的樹狀結構

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("菜單列表");

Folder f1 = new Folder("開始菜單");

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("娛樂");

f1_1_1.addChild(f1_1_1_1);

Folder f1_1_1_2 = new Folder("娛樂2");

f1_1_1.addChild(f1_1_1_2);

Folder f1_2 = new Folder("輔助工具");

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(" ", ""));

}

}

最後執行結果如下所示：

菜單列表

├開始菜單

│├程序

││└附件

││ ├娛樂

││ └娛樂2

│└輔助工具

├My Documents

└My Documents2