英文:
Alternative to try-catch in a loop
问题
我有一个Method对象的列表，我想使用用户提供的参数来执行这些对象，直到运行时我才知道参数的类型或值。
我想循环遍历方法数组，并使用invoke方法执行它们，直到其中一个方法成功执行而没有异常。这样做好吗？
Method[] methods = cls.getMethods();
for (Method method : methods) {
try {
method.invoke(obj, param1, param2);
break;
}
catch (Exception e) {
System.out.println(e);
}
}
有人告诉我在流程控制中使用try和catch是不好的主意，但我不太清楚为什么。在像这样的情况下，我不确定替代方案是什么，因为我预期在正常执行中会因为用户提供参数而引发异常。
非常感谢您的帮助。
英文:
I have a list of Method objects that I want to execute using user supplied parameters which I don't know the type or value until runtime.
I want to loop through the methods array and execute them using the invoke method until one of the methods executes successfully without an exception. Is this a good way to do it?
Method[] methods = cls.getMethods();
for (Method method : methods) {
try {
method.invoke(obj, param1, param2);
break;
}
catch(Exception e)
{
System.out.println(e);
}
}
I've been told that using try and catch for flow control is bad idea, but I'm not sure why. I'm also not sure what the alternative would be in a situation like this where I expect an exception to occur in the normal execution because the user supplies the parameters.
Any help is greatly appreciated.
答案1
得分: 2
在这种特殊情况下，为什么不尝试使用 getParametersType()。当参数类型与 param1 和 param2 的类型匹配时，您实际上可以执行 method.invoke(obj, param1, param2);
一般而言，这是一个不好的主意，因为您不知道一个函数有多么耗费资源。因此，在最终抛出异常之前，它可能会消耗大量的处理时间或 CPU 周期。
英文:
In this particular case , why don't you try getParametersType().
And when it parameter types matches the type of the param1 and param2 you can actually execute method.invoke(obj, param1, param2);
In general it is bad idea because you don't know how heavy a function is . So it might consume lot of processing time or cpu cycle before ultimately throwing exception.
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