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how to avoid NumberFormatException

 
Greenhorn
Posts: 23
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As we know, while parsing a string in to int/floal by using the method Integer.parseInt(String s)/Float.parseFloat(String s), it will return int/float value, if the String contains any numeric value like "101" or "101.11". but if it is not numeric like "a12", then it will throw NumberFormatException.

Please let me know, is there way to avoid this Exception except handling the exception means try catch block.

Thanks in advance.
 
Bartender
Posts: 10336
Hibernate Eclipse IDE Java
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Personally I check the string first with a regular expression. But you could also split the sting in to a character array and check each character is acceptable in an number.
 
Ranch Hand
Posts: 116
Eclipse IDE Tomcat Server
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You could just let it happen and then catch the exception, i.e.



Personally I find that easier than doing a validity check beforehand.
What to do if the string is not a valid numeric is more an issue and that's app specific.
 
Greenhorn
Posts: 10
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To avoid this exception you have to feed a valid integer or float values to parsers... this is the idea only... as you can not peal coconuts using potato pealers.. so to avoid breakage (of pealer) use potato only... not the coconut.. otherwise.. just check before pealing.. whether you are trying with potato only or not.... simple..
 
Ranch Hand
Posts: 109
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Why dont you want to make use of try catch ? Java provides very robust exception handling mechanism.
 
Wanderer
Posts: 18671
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JDK 5 provided another nice alternative:
 
Don't get me started about those stupid light bulbs.
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