如何复制同一张图片，生成50张排列名称为1.jpg,2.jpg,3.jpg,4.jpg，顺序1-50张的图片，同一张图片生成50份，名字排序不一样怎样写

public class CopyJpg {
        public static void main(String[] args) throws IOException {
            //根据数据源创建字节输入流对象
            ArrayList<String> array = new ArrayList<String>();
            for (int i = 1; i <= 50; i++) {
                int arr = i;
                String s1 = "files\\" + arr + ".jpg";
                array.add(s1);
            }
            System.out.println(array);
 
 
                FileInputStream fis = new FileInputStream("C:\\Users\\17517\\Pictures\\1.jpg");
                for(int i=0;i<array.size();i++){
                    String s = array.get(i);
                    FileOutputStream fos = new FileOutputStream(s);
                    byte[] bys = new byte[1024];
                    int len;
                    while ((len=fis.read(bys))!=-1) {
                        fos.write(bys,0,len);
                    }
                    fos.close();
                }
            fis.close();
        }}