How to Eliminate Duplicate Email Addresses in Java Using a HashSet?

Unique Email Address Detection in Java

Your goal is to remove duplicate emails from an array of addresses stored in a file. Here's how you can achieve this using a Set data structure:

In the provided code, an array, address, is used to store emails. However, to eliminate duplicates, you can leverage the HashSet class.

HashSet in Java

A HashSet is a collection of unique elements. When you add an element to a HashSet that already exists, it is not added again. This property makes it ideal for removing duplicates.

Code Modification

To use a HashSet to remove duplicates from your array, modify the code as follows:

1. Create a new HashSet called uniqueEmails.
2. Iterate through the address array and add each email to the uniqueEmails HashSet.
3. Convert the uniqueEmails HashSet back into an array using the toArray() method and store it in uniqueAddress.

// Create a HashSet for storing unique emails
Set<String> uniqueEmails = new HashSet<>();

// Iterate through the address array and add each email to the HashSet
for (String email : address) {
    uniqueEmails.add(email);
}

// Convert the HashSet back into an array
String[] uniqueAddress = uniqueEmails.toArray(new String[uniqueEmails.size()]);

// Print the unique email addresses
for (String email : uniqueAddress) {
    System.out.println(email);
}

This modified code ensures that all duplicate emails are eliminated and that only unique addresses remain in the uniqueAddress array.

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