eg_4

4. 编写一个程序，要求以树状结构展现特定的文件夹及其子文件(夹)

import java.io.*;

public class Test {

	public static void main(String[] args) {

		File f = new File("E:/Java/");

		System.out.println(f.getName());

		tree(f,1);

	}

	public static void tree(File f, int level) {

		String prestr = " ";

		for(int i=0;i<level;i++){

			prestr +="      ";

		}

		File childs[] = f.listFiles();

		for(int i=0;i<childs.length;i++){

			System.out.println(prestr+childs[i].getName());

			if(childs[i].isDirectory()){

				tree(childs[i],level+1);

			}

		}

	}

}

运行结果：

Java
       aa.txt
       ARE
             dd.txt
             ee.txt
             myfile.txt
       bb.txt
       cc.txt
       HAO
             Dictionaries
                   ak.docx
                   en-US-6-1.bdic
                   ggg.zip
             ff.txt

巴特西

eg_4

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