Program in java to copy files using command line argument

import java.io.*;

class Copy {

public static void main (String[] args) throws Exception
{
FileReader fin=new FileReader(args[0]);
FileWriter fout=new FileWriter(args[1]);
byte[] buffer =new byte[1024];
int i=0;
while(i!=-1)
{
i=fin.read();
fout.write(i);
}
fin.close();
fout.close();
System.out.println("File copied ");
}

}