Question

Write a java program to remove duplicate elements from an array. Do not use Java library utilities or 3^rd party tools to solve this problem. You need to use the “for loop” and manage the index as you traverse thru the array [i ] while looking for duplicates.

For example:

Example 1 ---------------------

Original Array:

105 123 -921 -1 123 8 8 8 -921

Array with unique values:

105 123 -921 -1 8

Example 2 ---------------------------

Original Array:

10 22 10 20 11 22 22

Array with unique values:

10 22 11 20

Answer 1

Java code with explanation:

import java.util.Scanner;

import java.util.Arrays;

public class removeDuplicates{

public static void main(String[] args) {

int n;

System.out.print("Please enter the size of the array: ");

Scanner sc = new Scanner(System.in);

n = sc.nextInt(); //reading input array size

int[] array = new int[n];

System.out.print("Please enter the " + n + " elements of the array: ");

for(int i = 0; i<n; i++)

array[i] = sc.nextInt(); //reading the elements of the array

Arrays.sort(array); //sorting the array, so that repeated elements are consecutive

int new_size = 0;

for (int i=0; i < n-1; i++){

if (array[i] != array[i+1]){ // if elements at index i is different to it's next element, then, considering the element

array[new_size++] = array[i];

}

}

array[new_size++] = array[n-1];

for(int i = 0; i<new_size; i++) //printing the elements

System.out.println(array[i]);

}

}

Screenshot of the code's output:

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