import java.io.*;

public class HelloWorld {

	//Main method.

	public static void main(String[] args) {

		CreateFile();

		ListFileName();

		ShowSeparator();

	}

	//Create a file.

	//Judge that the file exists.

	public static void CreateFile() {

		File f = new File("d:\\hello.xt");

		try {

			if (!f.exists()) {

				f.createNewFile();

				System.out.println("File created successfully.");

			} else {

				f.delete();

				f.createNewFile();

				System.out.println("File exists! File is created again.");

			}

		} catch (Exception e) {

			e.printStackTrace();

		}

	}

	//Get file name of all for loop.

	public static void ListFileName()

	{

		String _fileName="D:"+File.separator;

		File _fileObj=new File(_fileName);

		File[] _fileList=_fileObj.listFiles();

		for(File _file : _fileList)

		{

		  System.out.println(_file.getName()+"\n");

		}

	}

	//Separator is applyed to different system. For example,windows,linux and so on.

	public static void ShowSeparator()

	{

		System.out.println("file:"+File.separator+"\n"+"path:"+File.pathSeparator);

	}

}

本文由fang_beny原创，转载请注明出处。