Java - 檔案處理(1) - 如何複製貼上檔案(copy paste)

如果想要把某一個檔案，複製到另一個地方，程式如下:

        FileInputStream fis = null;
        FileOutputStream fos = null;
        try {
            fis  = new FileInputStream("/mnt/sdcard/sample.apk");
            fos = new FileOutputStream("/mnt/sdcard/sample.apk");
            byte[] buf = new byte[1024];
            int i = 0;
            while ((i = fis.read(buf)) != -1) {
                fos.write(buf, 0, i);
            }
            if (fis != null) fis.close();
            if (fos != null) fos.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }