Printing Unique Elements in an Array in Java

Learn how to print unique elements from a Java array efficiently. Explore different techniques and examples to handle duplicate elements in arrays.
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When working with arrays in Java, it's common to encounter scenarios where you need to print only the unique elements present in the array while excluding duplicates. There are several ways to achieve this, each with its own advantages. In this guide, we'll explore different techniques to print unique elements from an array in Java.

Method 1: Using HashSet

One of the most efficient ways to print unique elements from an array is by using a HashSet. Here's how you can do it:

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In this method, we use a HashSet to store unique elements. By iterating through the array and adding elements to the HashSet, we automatically eliminate duplicates. Finally, we print the unique elements present in the HashSet.

Method 2: Using Brute Force Approach

A simple approach to finding unique elements involves comparing each element with the rest of the elements in the array. If an element is not repeated, it is unique. Here's how you can implement this method:

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In this method, we use nested loops to compare each element with every other element. If an element is not repeated, it is considered unique and printed.

Method 3: Using Java Streams

Java streams provide an elegant way to handle arrays and collections. You can use streams to filter out unique elements and print them:

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In this method, we use the distinct() method from Java streams to filter out unique elements. The elements are then printed using the forEach() method.

These are three different methods you can use to print unique elements from an array in Java. Choose the one that best fits your requirements and coding style.