import java.io.File;

public class Test {	
	
	public static void main(String[] args) {
		File file = new File("D:\\Documents");
		printFile(file);
	}
	
	public static void printFile(File file) {
		String[] str = file.toString().split("\\\\");
		System.out.println("-" + str[str.length - 1]);
		printFile(file, 1);
	}
	
	private static void printFile(File path, int level) {
		File[] files = path.listFiles();
		if(files == null) {
			return;
		}
		for(File file: files) {
			for(int i = 0 ; i < level; i++) {
				System.out.print("  ");
			}
			String[] str = file.toString().split("\\\\");
			System.out.println("-" + str[str.length - 1]);
			if(file.isDirectory()) {
				printFile(file, level + 1);
			}
		}
	}
}