Java program to remove duplicates from integer array

Java program to remove duplicates from integer array

In this post we will write Java program to remove duplicates from integer array. This is one of the frequently asked Java coding interview questions for experience of 0-2 years. It is very easy to remove duplicates from an array using collections but interviewer may ask to write without using collections also. We will see both.

Remove duplicates using Collection

In this post we will use LinkedHashSet to remove duplicates from an array. You might remember that Set data structure doesn’t allow duplicate elements. If you want to know how Set restricts duplicate elements you can read this post – How HashSet is Implemented.

Remember to use LinkedHashSet implementation. Using HashSet will not maintain insertion order.

Remove duplicates without Collection

This one is little tricky. We need to implement our own algorithm. Here is an implementation using String.

Hope you find the post useful.

Also read my posts on Frequently asked Java interview questions with answers.

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Working as a Java developer since 2010. Passionate about programming in Java. I am a part time blogger.

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