編寫一個應用程式實現檔案的複製。使用格式：java Copy 原始檔目標檔案，功能是將原始檔的內容複製到目標檔案。

import java.io.*;
public class Main{
    public static void main(String args[ ]){
        try{  FileReader inOne=new FileReader("a.txt");
             BufferedReader inTwo= new BufferedReader(inOne);
             FileWriter tofile=new FileWriter("hello.txt");
             BufferedWriter out= new BufferedWriter(tofile);
             String s=null;
             while((s=inTwo.readLine())!=null){
                 out.write(s);
                 out.newLine();
             }
             out.flush();
             out.close();
             tofile.close();
             inOne=new FileReader("hello.txt");
             inTwo= new BufferedReader(inOne);
             while((s=inTwo.readLine())!=null){
                System.out.println(s);
             } 
             inOne.close();
             inTwo.close();
        }
        catch(IOException e){
             System.out.println(e.toString());
        }  
    }
}