字节读写文件

import java.io.*;
class Demo10
{
    public static void main(String s[])throws Exception
    {
        InputStream  is = new FileInputStream("Demo10.java");
        OutputStream os = new FileOutputStream("xxx.java");
        
        int data;
        while((data=is.read())!=-1)
        {
            System.out.print((char)data);   
            os.write(data);
        }
    
        is.close();
        os.close();
    }
}