java - char(int) 和 int 的区别

Question

我有一段代码，它从传感器接收值(通过使用 rxtx 的串行端口)并显示它。奇怪的是，下面的代码

int value = in.read();
System.out.print((char) value);

输出所需的值:

RXTX Warning:  Removing stale lock file. /var/lock/LK.005.018.009
20
27
29
26
21

但是当我将上面的代码更改如下时:

int value = in.read();
System.out.print("The value is"+(char) value);

输出变为:

RXTX Warning:  Removing stale lock file. /var/lock/LK.005.018.009
The value is2The value is6The value is
The value is2The value is2The value is

可以看出，整数 split 了。我想了半天都想不通？

有没有办法可以将控制台值保存为整数，因为我将来会使用这个值。

Answer 1

As it can be seen, the integer splits. For quite a while, I am unable to figure it out?

您不是在读取整数，而是在读取字符编码为“ASCII”的字节

Is there a way where I can save the console value into an integer, as I would be using this value in the future?

最简单的方法是使用扫描仪

Scanner scanner = new Scanner(in);
while (scanner.hasNextInt()) {
   // read bytes up the next whitespace, parse as a int
   int n = scanner.nextInt();