How to remove null values from arraylist in java

Using List. ArrayList ;. Arrays ;. List ;. Collections ;. Iterator ;. Predicates ;. Iterables ;. CollectionUtils ;. PredicateUtils ;. Rate this post. We are sorry that this post was not useful for you! Search for:. Facebook Twitter Instagram YouTube. This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Close Privacy Overview This website uses cookies to improve your experience while you navigate through the website.

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Table of Contents. Improve Article. Save Article. Like Article. Last Updated : 11 Dec, Attention reader! Viewed 35k times. Improve this question. Would it be possible to not allow null values into the array? Add a comment. Active Oldest Votes. Improve this answer. ChinLoong 1, 21 21 silver badges 23 23 bronze badges. Garrett Hall Garrett Hall I was thinking List , to minimize dependency on the actual type. KLE If I were returning the ArrayList, this would be a good idea, since I might want to change the implementation via polymorphism, but for a type within small method it does not matter.

Matvey Zhuravel Matvey Zhuravel 1 1 silver badge 11 11 bronze badges. You'll instead have to return the new array. Serge Slipchenko Serge Slipchenko 21 1 1 bronze badge. Arguments are passed by value in Java, and your assignment does NOT change the value of a in your first method. Try returning an instance to a2 in fillArray , and assign this value to a in removeNull. Vivien Barousse Vivien Barousse 20k 2 2 gold badges 57 57 silver badges 64 64 bronze badges.

Because it is possible that not every field is needed which means I have null-values at the end — 0xJoKe. I don't think that you can optimize with arrayCopy.