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Name validation

hello there guys it's Mike so diddly here and today I am here with another Java tutorial tab you get VAT a in your practical exam today I'm going to be teaching you how to check if the user input is a word so you may be asking user to input their name and in most case scenarios a name only is gonna contain letters so you want to make sure that the input only has letters in it if someone calls themselves Billy Bob one two three you don't want that because obviously it's an invalid name now a user names of this different case but we're on about actual names and just if do you want user to input words not numbers or special characters in that case so let's get right into it so first we're gonna make a string I'm gonna call it string input if I can type today and we're gonna call it duck not call it doc we're going to set it to duck sorry now we're gonna have a very very quick method so we're gonna do public static boolean so it's a boolean method again we usually use boolean efforts as we can use it to return a true or false which is really handy for validation when the call it is words and we're gonna take string in so what does this do well it's a it's a public boolean and we called it is word and we're taking in one string which we're gonna call in as our local variable and in we'll take the value of whatever input is so in this case in takes the value of duck I'm gonna have one line of code again so yeah we're gonna do return if I can type return correctly pattern dot matches brackets A to Z A to Z close brackets plus then we're gonna do the thing in no brackets test chilling me comma I'm gonna do in there there and we need to right click on pattern and fit and click on fix imports as we'll be importing a util library a region Pattin I will go into what that is but basically if you know memorize patterns you can do some really quick validation so what does this line of code actually do return means it's going to return a true or false to ever the methods called pattern dot matches basically we're using the pattern class and we're using the matches method and which we have were getting the string and we're checking if the string matches a certain set of rules which a pattern says this pattern basically saying if the pattern no if the string which we are testing in this case duck only contains characters from A to Z in lower case an A to Z and upper case then return true otherwise return false so let's go through this duck as our string in would return true as everything industry duck Matan follows the rules of this pattern all the characters are between a and Z and for both cases and all the characters here and CN there in both cases say if we had lowercase stuck by the way it would also be true by the way say if we had duck 1 2 3 this was being valid as clearly duck itself is fine as it's either upper case or lower case which is what this pattern allows however 1 2 3 is not in the pattern and therefore would return a false it's kind of hard to get your head around and I'm not going to explain everything about patterns because we don't need that for the exam we just need to be able to know how to use them because it can make validation so much quicker and in an exam you want to be quick and also using this just makes the exam that copies like oh it's first of knows how to use patterns and rejects is and all that kind of thing so it's all good now we want a little if statement to so we can outputs the user if it's valid a lot so we're gonna do if is would input funkin out for curly brackets I'm gonna do our else then gonna have our other curly brackets can do jape option paint dots show message log we're gonna do know why do these all keep popping up I hate the automatic adding of codes sometimes by NetBeans you can do invalid gonna close our bracket semicolon I'm gonna do a similar thing here J option pain dot show message diet dialog if I can type today want to do no invalid I meant valid what what oops oh my god i can't type sorry about that guys by the way X I already had the library imported from the start so that's why I didn't fix imports so what does this do well it's an if statement and we're calling the method is words and we're passing in the value of whatever input is which in this case would be duck one two three so if this becomes true then we're gonna execute this piece of code and say valid if it's not true which means it has to be false we're gonna execute this bit of code and tell the user it's invalid so I've really gone for out of the method work so let's just let's just test it in action shall we we're gonna click run project and it's gonna be invalid because duck 1-2-3 does not match this pattern as one two three is not in the range of A to Z for both cases well I said C before what if I changed how I said it I I don't know now let's change our input to duck let's see what that in happens by the way should be true and it says valid why well because duck is uppercase T and lowercase uck and fat fits the pattern of being a to Zed for even though occasionally uppercase so that's all for this tutorial I hope this helps for sure to leave a like in the comment if it did if you want any help or confused about something then leave a comment and also why not share this tutorial for your friends so you can all we can all get aids together anyway thanks for being a great audience and we will see you next time goodbye