Effortless Duplicate Removal: A Java ArrayList Refresher

The Set Solution: A Simple yet Effective Approach

Imagine having an ArrayList named numbers containing duplicate elements. To remove these duplicates, we can utilize the power of Java Sets. Here’s how:

Set<Integer> set = new LinkedHashSet<>(numbers);
numbers.clear();
numbers.addAll(set);

This approach takes advantage of the Set’s inherent property of automatically removing duplicates. By using LinkedHashSet, we maintain the insertion order while removing duplicates.

The Stream Solution: A Modern Approach

In our second example, we’ll harness the power of Java Streams to remove duplicates from the numbers ArrayList. Here’s the step-by-step process:

List<Integer> uniqueNumbers = numbers.stream()
   .distinct()
   .collect(Collectors.toList());
numbers.clear();
numbers.addAll(uniqueNumbers);

This approach leverages the stream() method to create a Stream from the ArrayList, followed by the distinct() method to remove duplicate elements. Finally, we collect the results into a List and convert it back into an ArrayList.

With these two solutions, you’ll be well-equipped to tackle duplicate elements in your Java ArrayLists. So, which approach will you choose?

• Learn more about LinkedHashSet and its benefits.