Dec 11, 2018 · Given an ArrayList with duplicate values, the task is to remove the duplicate values from this ArrayList in Java. Examples: Get the ArrayList with duplicate values. Create another ArrayList. Traverse through the first arraylist and store the first appearance of each element into the second arraylist using contains () method.

Oct 15, 2008 · The easiest way to remove repeated elements is to add the contents to a Set (which will not allow duplicates) and then add the Set back to the ArrayList: Of course, this destroys the ordering of the elements in the ArrayList. …

May 17, 2010 · the correct way to remove duplicates from a list in Java is to use a Set. And you can't just override equals() without overriding hashCode() as well. –

Apr 16, 2015 · You can get a stream from the List and put in in the TreeSet from which you provide a custom comparator that compares id uniquely. Then if you really need a list you can put then back this collection into an ArrayList.

Nov 28, 2024 · How to remove all duplicate elements from a List - first with plan Java, then Guava and finally with Java 8 lambdas.

This Java 8 program demonstrates how to remove duplicate elements from a list using streams and the distinct() method. The program covers simple lists of integers and strings, as well as lists of custom objects.

Learn to remove duplicate elements from a List in Java using Collection.removeIf(), HashSet, LinkedHashSet, and Stream APIs. This table compares the different approaches and their advantages.

The arraylist contains duplicate elements. Here, we have used the Stream class to remove duplicate elements from the arraylist. numbers.stream() - create a stream from the arraylist; stream.distinct() - removes duplicate elements; stream.collect(Collectors.toList()) - returns a …

Nov 9, 2024 · In this guide, we’ll explore how to remove duplicate elements from lists in Java with step-by-step examples, covering both basic lists and lists of objects. You’ll learn several ways to remove duplicates, from simple approaches in plain Java to …

Dec 27, 2023 · Use a method in the Java Streams API to remove duplicates from a List. Use a HashSet to automatically dedupe the List. Write your own Java algorithm to remove duplicates from a List.