在Java中将带空格的String转换为Integer [英] Converting a String with spaces to an Integer in java

问题描述

我正在尝试将String变量转换为整数，只有String看起来像这样（例如）：

I'm trying to convert a String variable into an integer, only the String looks like this (for example):

String string = " 12";

因此String前面有一个空格。现在正在从.txt文件中读取String变量，这就是为什么我遇到了在它前面有空间的问题。我需要将变量转换为int，但是当我尝试时：

And so the String has a space in front of it. Now the String variable is being read from a .txt file which is why I'm having the issue of having the space in front of it. I need to convert the variable into an int, but when I try:

int integer = Integer.parseInt(string);

将String传递给一个整数，它编译但是在尝试运行程序时遇到错误，因为有空格作为字符串的一部分。

to pass the String into an integer, it compiles but I get an error when trying to run the program, since there is white space as part of the String.

有没有办法将前面有空格的数字串传递给int？ .trim会工作吗？如果是这样，我将如何使用它？ （我对.trim不是很熟悉，我还在学习!!）我很感激你的帮助！ ^ _ ^

Is there a way to pass a String of numbers with a space in front of it into an int? Would .trim work? And if so, how would I use that? (I'm not very familiar with .trim, I'm still learning!!) I appreciate the help! ^_^

推荐答案

.trim会工作吗？如果是这样，我将如何使用它？

Would .trim work? And if so, how would I use that?

是， trim（）将起作用，它将从 String 中移除前导和尾随空格，

Yes, trim() will work, it will remove leading and trailing spaces from String,

int integer = Integer.parseInt(string.trim());

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