遞歸展現文件結構目錄

代碼以下：

import java.io.File;

public class FileList {
	public static void main(String[] args) {
		File f = new File("A");
		System.out.println(f.getName()); //根目錄
		FileList.tree(f, 1);
	}
	
	private 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);
			}
		}
	}
}