关于File类中的问题

我创建了一个File的文件类对象a,并调用File类中的renameTo(b)方法，而a对应的文件与b对应的文件在同一文件夹中，请问运行后a对应的文件会被覆盖吗？
以下是我运行的程序:
package File;
import java.io.*;
import java.util.Date;

public class RenameFile {

    //显示文件基本信息
    private static void fileDate(File f){
        System.out.println(
                "Absolute path:"+f.getAbsolutePath()+
                "\n Can read:"+f.canRead()+
                "\n Can write:"+f.canWrite()+
                "\n getName:"+f.getName()+
                "\n getParent:"+f.getParent()+
                "\n getPath"+f.getPath()+
                "\n length:"+f.length()+
                "\n lastModified:"+new Date(f.lastModified()));
        if(f.isFile())
            System.out.println("It's a file");
        else if(f.isDirectory())
            System.out.println("It's a directory");
    }
    //命令行第一个参数是原来的文件名，第二个参数是新文件名
    public static void main(String []args){
        
        File a=new File("myfile.txt");
        File b=new File("file.txt");
        
        System.out.println("The original file's information:");
        fileDate(a);
        a.renameTo(b);
        System.out.println("\n The file information after rename:");
        fileDate(b);//文件 重命名
        fileDate(a);
        if(!a.exists()){
            System.out.println("\n The original file never exists.");
        }
        
    }
   
}

这是运行后的结果:
The original file's information:
Absolute path:D:\eclipse\workplace\IO.wenjianjibenxinxihuoqu\myfile.txt
Can read:true
Can write:true
getName:myfile.txt
getParent:null
getPathmyfile.txt
length:0
lastModified:Thu Jan 01 08:00:00 CST 1970

The file information after rename:
Absolute path:D:\eclipse\workplace\IO.wenjianjibenxinxihuoqu\file.txt
Can read:true
Can write:true
getName:file.txt
getParent:null
getPathfile.txt
length:14
lastModified:Tue Oct 05 13:11:49 CST 2010
It's a file
The original file never exists.

a的文件是否被覆盖了?有人知道吗?


[ 本帖最后由 tmaceye 于 2010-11-3 12:07 编辑 ]
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