Java – regular expression or exception handling?

Which of the following is better to check whether the string is floating?

try{
 Double.parseDouble(strVal);
}catch(NumberFormatException e){
 //My Logic
}

or

if(!strVal.matches("[-+]?\\d*\\.?\\d+")){
 //My Logic
}

In terms of performance, maintenance and readability?

Yes, I want to know which is a good coding exercise?

Solution

Personal opinion - I've seen code, and I hope most developers tend to try - capture blocks Try catch is also more readable in a sense and assumes that in most cases the string will contain significant numbers But there are many things to consider your example, which may affect the effect of your choice

>You often want strings to contain no significant digits. > Note that for batch processing, you should create a pattern object outside the loop This will prevent the code from recompiling the mode every time. > As a general rule, you should never use expectations as a logical process Your try catch represents logic. If it is not a string, your regular expression represents logic if it is a number Therefore, it is not obvious what the context of the code is. > If you choose regular expression technology, you may still need to convert at some point, so in fact, it may be a waste of energy. > Finally, whether the performance requirements of the application are important enough to ensure analysis at this level In general, I recommend keeping it as simple as possible, making it work, and then using some code analysis tools to find bottlenecks and adjust them if there are performance problems