Remove null values from array java

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Writing code in comment? Please use ide. Load Comments. What's New. Vote count: 8. No votes so far! Be the first to rate this post. Primary Primary. Skip to content. Using Collection. Arrays ;. List ;. ArrayList ;. Objects ;. There is an easy way of removing all the null values from collection. You have to pass a collection containing null as a parameter to removeAll method. I played around with this and found out that trimToSize seems to work. I am working on the Android platform so it might be different.

I used the stream interface together with the stream operation collect and a helper-method to generate an new list. Using Java 8 this can be performed in various ways using streams, parallel streams and removeIf method:. The parallel stream will make use of available processors and will speed up the process for reasonable sized lists.

It is always advisable to benchmark before using streams. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How to efficiently remove all null elements from a ArrayList or String Array?

Ask Question. Asked 10 years, 11 months ago. Active 29 days ago. Viewed k times. Can anyone suggest me a better solution? Improve this question. Juan de Dios Juan de Dios 2, 2 2 gold badges 19 19 silver badges 22 22 bronze badges. Dig java-doc. Add a comment. Active Oldest Votes. Try: tourists. Improve this answer. Community Bot 1 1 1 silver badge. Lithium Lithium 5, 1 1 gold badge 19 19 silver badges 32 32 bronze badges. Time complexity of List.

Just saying. For Java 8 or later, see MarcG's answer below. Hemanth Can you elaborate on how you got that time complexity? The same time complexities apply for LinkedList , where they didn't have to put so much effort, because removes are cheap by definition if you have the reference to the node. Hemanth No it isn't.