import java.io.*;
public class FileClass1{
    public static void main(String[] args){
        File path=new File("d:\\javatry\\classtry");
        File oldFile=new File("d:\\javatry\\classtry\\My.class");
        File newPath=new File("d:\\javatry\\classtry\\tmp");
        File newFile=new File("d:\\javatry\\classtry\\tmp\\Ok.ok");
        String[] stringArray;
        stringArray=path.list();
        System.out.println("begin list file names in path");
        for (int i=0;i<stringArray.length;i++)
             System.out.println(stringArray[i]);
        System.out.println("name of path="+path.getName());
        System.out.println("parent of path="+path.getParent());
        System.out.println("length of old="+oldFile.length());
        newPath.mkdir();
        try{
            newFile.createNewFile();
            }catch(Exception e){}
        stringArray=newPath.list();
        System.out.println("begin list file names in newpath");
        for(int i=0;i<stringArray.length;i++)
             System.out.println(stringArray[i]);
        System.out.println("absolute pathname of newfile="+newFile.getAbsolutePath());
        System.out.println("length of newfile="+newFile.length());
        }
    }