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# 字符串
### 输入与输出
>-next不能输入空格
>-nextLine可以输入空格
### 输入流
>- // System.in 读取键盘上的数据
>- // InputStreamReader 将字节流向字符流的转换
>- InputStreamReader isr = new InputStreamReader(System.in); // 读取
>- // 创建字符流缓冲区
>- BufferedReader br = new BufferedReader(isr); // 缓冲
>- // 读取一个文本行
>- String s = br.readLine(); // 阻塞式，当没有数据读取时，就一直会阻塞，而不是返回null
