Validating an integer in java

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In Java 1.4 and later you could make a regular expression (or two or three) that test whether a string matches the format you need.

For full information on the specifications, go ahead and read through the JSR 380.

I have the information about the maximum integer digits and maximum allowed digits in the fraction part. If so, you can figure out how many digits are before & after any decimal point. I was using parse for validating but figured out its the wrong way... In my validation i require 2 things: 1) Validate whether is the string is a number or not 2) The integer and fraction part is also as per my requirement.

Per the JSR 380 specification, the validation-api dependency contains the standard validation APIs: is entirely separate from the persistence aspects of Hibernate and by adding it as a dependency, we're not adding these persistence aspects into the project. This is the message that will usually be rendered when the value of the respective property fails validation.Another example is to validate if user correctly input letters to guest a secret word.In the code snippet below if the user does not enter a letter the code will keep asking for a valid letter. Number Format Exception: For input string: "10A" at programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums I'm new here... So, Lambert: if you are familiar with regular expressions, or are sufficiently motiviated to learn more about them, I recommend something like the above.

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