测试字符串是否为整数？ [英] test if a string is an integer?

问题描述

我正在阅读表格中的输入。我想验证输入是否确认

该字符串实际上是一个整数。我该怎么做？我是否需要

将其转换为角色阵列并分解每个角色并进行测试？

还是有更简单的方法吗？谢谢。

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解决方案

" dave" <去********************** @ nowhere.com>在留言中写道

新闻：FA ****************** @ nwrdny02.gnilink.net ...

我我正在阅读表格中的输入。我想通过使
确保该字符串实际上是一个整数来验证输入。我该怎么做？我是否需要将其转换为角色阵列并分解每个角色并对其进行测试？
还是有更简单的方法？谢谢。

尝试执行Integer.parseInt（yourString），如果它抛出一个

NumberFormatException，你就会知道字符串isn' '有效整数

" dave" <去********************** @ nowhere.com>在留言中写道

新闻：FA ****************** @ nwrdny02.gnilink.net ...

我我正在阅读表格中的输入。我想通过使
确保该字符串实际上是一个整数来验证输入。我该怎么做？我是否需要将其转换为角色阵列并分解每个角色并对其进行测试？
还是有更简单的方法？谢谢。

将字符串传递给parseInt并捕获NumberFormatException。

参见：
http：//java.sun .com / j2se / 1.4.2 / docs / ... va.lang.String ）

-

Gary

" Murray" < PA *** @ SMAFFoffSPAMMER.optusnet.SPAMMAGE.com.au>在消息中写道

新闻：6P **************** @ news-server.bigpond.net.au ...

dave <去********************** @ nowhere.com>在消息中写道
新闻：FA ****************** @nwrdny02.gnilink.net ...

我正在阅读来自表单。我想通过使

确定

来验证输入，该字符串实际上是一个整数。我该怎么做？我需要
将其转换为字符数组并分解每个字符并测试
吗？或者有更简单的方法吗？谢谢。

尝试执行Integer.parseInt（yourString），如果它抛出一个
NumberFormatException，你就会知道字符串isn''ta有效整数

你真的是指整数吗？或者是数字。好的，那么你可以使用

Double.parseDouble（string）;这将返回整数的结果，

浮点数和双打。

I am reading input from a form. I want to validate the input by making sure
that the string is actually an integer. How would I do this? Do i need to
convert it to a character array and break down each character and test it?
or is there an easier way? Thanks.
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解决方案

"dave" <go**********************@nowhere.com> wrote in message
news:FA******************@nwrdny02.gnilink.net...

I am reading input from a form. I want to validate the input by making sure that the string is actually an integer. How would I do this? Do i need to
convert it to a character array and break down each character and test it?
or is there an easier way? Thanks.

Try to perform Integer.parseInt(yourString) and if it throws a
NumberFormatException you''ll know the string isn''t a valid integer

"dave" <go**********************@nowhere.com> wrote in message
news:FA******************@nwrdny02.gnilink.net...

I am reading input from a form. I want to validate the input by making sure that the string is actually an integer. How would I do this? Do i need to
convert it to a character array and break down each character and test it?
or is there an easier way? Thanks.

Hand the String to parseInt and catch NumberFormatException.
see:
http://java.sun.com/j2se/1.4.2/docs/...va.lang.String)
--
Gary

"Murray" <pa***@SMAFFoffSPAMMER.optusnet.SPAMMAGE.com.au> wrote in message
news:6P****************@news-server.bigpond.net.au...

"dave" <go**********************@nowhere.com> wrote in message
news:FA******************@nwrdny02.gnilink.net...

I am reading input from a form. I want to validate the input by making

sure

that the string is actually an integer. How would I do this? Do i need to convert it to a character array and break down each character and test it? or is there an easier way? Thanks.

Try to perform Integer.parseInt(yourString) and if it throws a
NumberFormatException you''ll know the string isn''t a valid integer

Do you really mean integer? Or is a "number" ok, then you can use
Double.parseDouble(string); which will return a result for integers,
floats, and doubles.

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