标准输入输出流

//方法一：
        InputStream is = System.in; //字节流
        int by;
        while ((by = is.read()) != -1) {
            System.out.print((char) by);
        }
        //如何把字节流 转换为 字符流？ 用转换流
        // BufferedReader br = new BufferedReader(isr);

        //方法二：
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        br.readLine();
        int i = Integer.parseInt(br.readLine());

        //方法三：
        Scanner scanner = new Scanner(System.in);
        scanner.nextLine();
        scanner.nextInt();
        scanner.next();

  //方法一：
        PrintStream out = System.out;
        out.println("1111");
        out.print(11);

        //方法二：
        System.out.println("11111111");
        System.out.print(11);