ls

ls.java

import java.io.File;

public class ls {
	public static void main(String[] args) {
		if (args.length == 0) System.out.println("please input path ...");
		else {
			dirlist(args[0]);
		}
	}
	
	private static void dirlist(String path) {
		File dir = new File(path);
		String[] list = dir.list();
		
		try { System.out.println("List of " + dir.getCanonicalPath()); } catch (Exception e) { System.out.println("Error: "+e.getMessage()); }
		
		for (String list_ : list) {
			File isDir = new File(path + "/" + list_);
			if (isDir.isDirectory()) list_ = list_ + File.separator;
			System.out.println(list_);
		}
		
	}
}

Notes

fix bug : show folder path