程序代码：

import *;

public class FileTest {

    /**
     * @param args
     */
    public static void main(String[] args) throws FileNotFoundException 
    {
        String dir = System.getProperty("user.dir");
        System.out.println(dir);
        
        PrintWriter out = new PrintWriter("myfile.txt");
        out.print(dir);
    }

}