实例化对象失败（设计模式） [英] instantiating an object fails (design patterns)

问题描述

让我说我有一个类

类Thing

{

函数__construct（$ string）

{

//用字符串初始化

}

}

让'比如传递一个无效的字符串来构造它。什么是

处理这个问题的适当方法？我知道在Java中我可能会抛出

异常，但我不知道有多少人真的在

PHP中使用异常。所以，我不想依赖它。


处理这类情况的适当方法是什么？我想b / b
想到两个选项


1.如果Thing不能为
，那么只返回null的ThingFactory实例化。


2.删除构造函数，只需要一个initThing（$ string）方法

，当出现问题时返回false。


这里适合什么？


-
http://www.douglassdavis.com

lets say i have a class
class Thing
{
function __construct($string)
{
// initialize by string
}
}
Let''s say an invalid string is passed to construct it. What is the
appropriate way to handle this? I know in Java I would probably throw
an exception, but I don''t know how much people really use exceptions in
PHP right now. So, I don''t want to depend on it.

What would be the appropriate way to handle this type of situation? I
was thinking of two options

1. A ThingFactory that just returns null if the Thing couldn''t be
instantiated.

2. Remove the constructor and just have an initThing($string) method
that returns false when something goes wrong.

What would be appropriate here?

--
http://www.douglassdavis.com

推荐答案

string）

{

//用字符串初始化

}

}

让我们说传递一个无效的字符串来构造它。什么是

处理这个问题的适当方法？我知道在Java中我可能会抛出

异常，但我不知道有多少人真的在

PHP中使用异常。所以，我不想依赖它。


处理这类情况的适当方法是什么？我想b / b
想到两个选项


1.如果Thing不能为
，那么只返回null的ThingFactory实例化。


2.删除构造函数，只需要一个initThing（

string)
{
// initialize by string
}
}
Let''s say an invalid string is passed to construct it. What is the
appropriate way to handle this? I know in Java I would probably throw
an exception, but I don''t know how much people really use exceptions in
PHP right now. So, I don''t want to depend on it.

What would be the appropriate way to handle this type of situation? I
was thinking of two options

1. A ThingFactory that just returns null if the Thing couldn''t be
instantiated.

2. Remove the constructor and just have an initThing(

字符串）方法

返回false什么时候出错了。


这里适合什么？


-
http://www.douglassdavis.com

string) method
that returns false when something goes wrong.

What would be appropriate here?

--
http://www.douglassdavis.com

< a rel =nofollowhref =http://www.douglassdavis.comtarget =_ blank> www.douglassdavis.com 写道：

www.douglassdavis.com wrote:

班级事件
{
函数__construct（

lets say i have a class
class Thing
{
function __construct(

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