Can you return an arraylist in java

Arrays in Java. Strings in Java. OOPS in Java. Constructors in Java. Interfaces in Java. Keywords in Java. Exception Handling in Java. Collection Framework. Multi-threading in Java. Table of Contents. Save Article. Improve Article.

Like Article. Previous List Interface in Java with Examples. Next Vector Class in Java. Recommended Articles. Article Contributed By :. Easy Normal Medium Hard Expert. Writing code in comment? If your analyzer only contains a list of people, you can easily implement the removePerson method using the Collection.

Don't return null from methods. Return Optional. This may appear a little bit advanced for you now, but maybe it will give you something to hold on to when learning about the concepts I've described earlier: import java. Entry; import static java. Liutauras Vilda. I like Double check if you aren't mistaken about removing person form the stats based on his name equality. If there are persons: Person John, 10, 7, Person John, 22, 1, Your method is able to remove only the very first John running method once.

Maybe check beforehand if such Person object can be legal with given values? Also I think Person supposed to have some randomly generated identifier, which uniquely would identify its identity. Current implementation does not permit Persons with same names and which appear got birth on the same date. Stephan van Hulst I tried your method but it does not seem to work? Paul Clapham. Two things: You'll want to create your ArrayList only once, before you start going through the Persons.

And you'll want to delay returning it until you've gone through all of the Persons. After all, it's possible that there's more than one Person born in July, right? Steven Villarreal wrote If you're looking for help with something like that, it's much more helpful if you tell us what exactly isn't working. For instance if I want to know who's born in July I would type in 7 and it would return the people born in that month. I just don't know how to do that though. The function myNumbers is not static.

So, we need to create an instance of ClassB in ClassA. A static function can be accessed or invoked without creating an object of the class to which it belongs.

If the static method is to be called from outside its parent class, we have to specify the class where that static function was defined. Do not sell my personal information. Close Privacy Overview This website uses cookies to improve your experience while you navigate through the website.

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