Write a Java program to remove the duplicate elements of a given array and return the new length of the array

1. Break Down the Problem

To solve the problem, we need to:

1. Identify duplicates in the given array.
2. Create a new array or modify the existing one to store unique elements.
3. Return the length of the new array/list containing only unique elements.

2. Relevant Concepts

We can use a data structure like a HashSet to keep track of unique elements since it doesn’t allow duplicates. We will iterate over the input array, add elements to the HashSet, and finally convert it back to an array if needed.

3. Analysis and Detail

The Java code will:

• Utilize an array as input.
• Employ a HashSet to store unique elements.
• Convert the HashSet back to an array if necessary (for demonstration).
• Return the size of the HashSet, which is the length of the array without duplicates.

4. Verify and Summarize

We will ensure that the code correctly identifies duplicates and returns the expected output.

Final Answer

Here’s the complete Java program:

import java.util.HashSet;

public class RemoveDuplicates {

    public static void main(String[] args) {
        int[] array = {1, 2, 3, 1, 2, 4, 5}; // Sample input
        int newLength = removeDuplicates(array);
        System.out.println("The new length of the array is: " + newLength);
    }

    public static int removeDuplicates(int[] array) {
        HashSet<Integer> uniqueElements = new HashSet<>();

        // Add elements to HashSet to remove duplicates
        for (int num : array) {
            uniqueElements.add(num);
        }
        
        // Calculate the new length (size of HashSet)
        return uniqueElements.size();
    }
}

This program will output the new length of the array after removing duplicates.