Topic: 判断是否为数值数据

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1.判断是否为数值数据 Copy to clipboard
Posted by: wslss007
Posted on: 2005-11-02 12:18

以下代码是判断是否为数值数据:
for(int i=1;i<args[0].length();i++){
ch=args[0].charAt(i);
if(!Character.isDigit(ch))}
throw new NumberFormatException();}}

我是初学者,看不大懂,是要先记下来呢?还是以后会学到类似的知识。

以后贴代码的时候,把<禁止在这个帖子中使用笑脸标记>这个选项钩上

2.Re:判断是否为数值数据 [Re: wslss007] Copy to clipboard
Posted by: bluecrystal
Posted on: 2005-11-02 12:37

判断方法很多的
这个也算是一种把

3.Re:判断是否为数值数据 [Re: wslss007] Copy to clipboard
Posted by: Jcat
Posted on: 2005-11-02 14:32

1.命令行参数
2.Character类
3.异常处理(抛出异常)

弄清楚这三个问题,你应该就能看懂你的代码了。
前两个比较简单,第三个稍微花点功夫 :)

4.Re:判断是否为数值数据 [Re: wslss007] Copy to clipboard
Posted by: wslss007
Posted on: 2005-11-02 15:08

i have never learn the class character .which chapter is it in?

5.Re:判断是否为数值数据 [Re: wslss007] Copy to clipboard
Posted by: Jcat
Posted on: 2005-11-02 15:40

The Character class wraps a value of the primitive type char in an object. An object of type Character contains a single field whose type is char. In addition, this class provides several methods for determining a character's category (lowercase letter, digit, etc.) and for converting characters from uppercase to lowercase and vice versa.

你可以在一些IDE的帮助文档,或直接在JDK documentation里找到各种类的详细用法及讲解。

上述摘引在JBuilder的帮助和JDK文档里都有。


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