键盘输入10个数，放到数组中 (1)去除该数组中大于10的数 (2)将该数组中的数字写入到本地文件number.txt中

ゞ浴缸里的玫瑰 2024-04-19 10:31 46阅读 0赞

/**
         * 3.键盘输入10个数，放到数组中
         * (1)去除该数组中大于10的数
         * (2)将该数组中的数字写入到本地文件number.txt中
         */
        public static void fun3(File f) {
            Scanner scanner = new Scanner(System.in);
            int num = 0;
            String s = "";
            for (int i = 0; i < 10; i++) {
                if ((num = scanner.nextInt()) <= 10) {
                    s += num;
                }
            }
    
            FileOutputStream fos = null;
            InputStream is = null;
            try {
                fos = new FileOutputStream(f);
                is = new ByteArrayInputStream(s.getBytes());
                FileStreamUtils.copy(is, fos);
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                FileStreamUtils.close(is, fos);
            }
        }
    
    
    /**
     * 流工具类
     */
    public class FileStreamUtils {
    
        /**
         * 拷贝
         * @param is
         * @param os
         */
        public static void copy(InputStream is, OutputStream os) {
            try {
                byte[] buf = new byte[1024];
                int len = 0;
                while ((len = is.read(buf)) != -1) {
                    os.write(buf, 0, len);
    
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    
        /**
         * 关流
         * @param is
         * @param os
         */
        public static void close(InputStream is, OutputStream os){
            try {
                if (is != null)
                    is.close();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    if (os != null)
                        os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }