Print duplicate elements in array in java. Different ways are explained.

Print duplicate elements in array in java. We'll use the Stream API, Collectors and Collections. Nov 9, 2022 · Learn to find, count and remove duplicate elements from an array in Java using Streams, Map and Set from the Collections framework. If a match is found then we print the index and duplicate element. This guide will show you how to create a Java program that identifies and displays duplicate elements in an array. What is duplicate number? Duplicate means two identical copies of same element. In this tutorial, we will learn how to find duplicate elements in an array of strings. Print Duplicate in Array InterviewBit solution. How can we detect this duplicate in time O (n)? For example, an array of 4,1,2,3 would become 4,1,2,2. 12 How to print duplicate Elements in ArrayList in Java Tutorial, Find duplicate element from an Aug 26, 2015 · Do a first run through of the array to see how many duplicates there are Create a new array of size (oldSize - duplicates) Do another run through of the array to put the unique values in the new array Since the array is sorted, you can just check if array [n] == array [n+1]. In this example, the program finds 2 twice and 1 twice, so it prints them as duplicates. Printing elements of an array Using for loop The algorithm used in this approach is as follows: Step 1: Declare and initialize an array. Objective: Given a set of integers in array, we have to print all unique values from the array. Given an array of n numbers, give an algorithm for checking whether, there are any duplicates in the array or not? For such questions obvious answer is Brute force or Naive solution. Now, let's understand the logic behind each of those solutions in little more detail. That Java program finds or duplicates elements from the array. add () method: If the element is present in the Set already, then this Set. for example this array has 4 duplicates now. Problem Description Given an array of integers, find and print the repeated elements and their frequency of repetition. May 4, 2023 · Learn how to find duplicate elements and the frequency of repeated elements in a Java array using nested loops, sets, streams, and hash tables. See full list on baeldung. There are multiple ways to achieve this in Java, each with its own benefits and complexity. Sep 20, 2023 · In this tutorial, we'll go over how to find duplicate elements in a Java Stream from a list, map or set. This code will print out the duplicate elements. The time complexity of this approach is O (n2). There is only one repeated number in nums, return this repeated number. You must solve the problem without modifying the array nums and using only constant extra space. It highlights key Java concepts such as hash-based data structures and string processing. java ? Jun 12, 2017 · Actually, there is a more simple solution using Java TreeSet. Explanation: We go through the array one element at a time. You will found different methods to solve this problem in this page. please watch the full playlist for more java tut 1 If your array satisfied these two conditions -: Only duplicates and single value allowed (No triplicate or greater allowed) There should only be one unique value in the array // Use Bitwise 'exclusive or' operator to find unique value int result = array[0]; for (int i = 1; i < array. *; public class Main { Dec 13, 2022 · Learn to find duplicate Elements in the array, Find the Duplicate element, if it is two or more duplicate element. As we traverse the sorted string, we increment a counter for each matching character, and only print those with count > 1. If I have understood the question correctly, we all have to look for number of duplicate occurrence not how many times it present. I need to print also rest of array element, please try to help me. Oct 18, 2024 · Finding the first duplicate in an array can be done using different strategies, each with its time and space complexity trade-offs. If the add() method returns back false then that element already exists in the set and it is there for your duplicate. Different Ways to Find Duplicate Elements in an Array There are various ways of doing it: Nov 1, 2024 · for explanation watch video Find Duplicates using HashSet import java. There is only one duplicate element, find the duplicate element in O (n) time complexity and O (1) space. add () returns false. Jul 1, 2018 · Write a java program to remove duplicate elements from sorted array. is there any methods or classes for it? can you help me to implement my own? Printing all elements of an array in one println statement in Java [duplicate] Asked 10 years, 8 months ago Modified 10 years, 8 months ago Viewed 41k times Code is trying to reduce the size of an array once it finds replication of a number. com Finding duplicate elements in an array is a common problem in programming, especially in data processing tasks. Examples: Input: arr [] = {10, 5, 3, 4, 3, 5, 6} Output: 5 Explanation: 5 is the first element that repeats Input: arr [] = {6, 10, 5, 4, 9, 120, 4, 6, 10} Output: 6 Explanation: 6 is the first Dec 27, 2024 · By Dynamic Initialization of Array Elements Method-1: Java Program to Find the Duplicate Values of an Array of String Values By Static Initialization of Array Elements Approach: Create a string array. Then, we iterate over an array to check if the next adjacent element is a duplicate or not. Traverse through the first arraylist and store the first appearance of each element into the second arraylist using contains () method. Aug 13, 2019 · I am a newbie here. Jul 23, 2025 · In Java, copying an array can be done in several ways, depending on our needs such as shallow copy or deep copy. The output should show the non duplicate element i. We have kept the different logics for sorted and unsorted array in this post. Examples : Input : arr[] = {1, 4, 3, 4, 2} Output : 4 Input : arr[] = {1, 3, 2, 1} Output : 1 Approach: Firstly, the constraints of this problem imply that a cycle must exist. Jul 25, 2025 · Introduction Arrays in Java store multiple elements of the same type, but duplicates can cause inefficiencies. Learn how to check for duplicate elements in a Java array using nested loops, HashSet, and sorting. To find duplicate elements, we will count the frequency of each elements of array and store it in a Map<integer, integer=””>. If a number is present two times in array we will treat this element as duplicate number. This new array is used to store the frequency of each element and then only those elements are printed whose frequency is greater than 1. In my solution, the idea is that you have a second array where the index (the numeric value representing which item in the array you care about) of the boolean array is used to correspond to the index of the flower array. Dec 12, 2023 · Discover 5 Effective Methods in Java to Remove Duplicates values from an array while Preserving the Original Order. Now from if condition we check first elements is equals to next elements. Let's see how we can do it by Jul 12, 2025 · There are many methods to find duplicate elements in a Stream: Using Set: Since Set has the property that it cannot contain any duplicate element. This can be achieved using two loops. Using stream () method :- First convert String Arrays to list using Arrays. If There are multiple ways to delete all duplicate elements from an arrays. Program is intended to take user input. Mar 3, 2019 · How to Find Duplicate Elements in an Array METHOD 1 – Using brute force approach This is the most basic and easiest approach to find and print duplicate elements of an array. However when you have 3 same elements, you count the last one twice - when you run internal loop for first and for second element. May 27, 2018 · Find duplicate value in array list and print the duplicated value Asked 7 years, 2 months ago Modified 3 years ago Viewed 41k times Mar 15, 2020 · - Java 8 - Find duplicate elements in a Stream Aug 27, 2023 · Here’s a Java program that demonstrates how to implement a method to find duplicate elements in an ArrayList. we can collect them. The following code prints some element in the array more than one time. Jul 17, 2022 · Few simple examples to find or count the duplicates in stream and remove the duplicates from stream in Java 8. Question:- Count Jul 23, 2025 · Using for loop Using standard library arrays Using while loop Using forEach () method 1. May 9, 2025 · Java exercises and solution: Write a Java program to remove duplicate elements from an array. 2. Loop method: The first thing that comes to mind is to write a for loop from i = 0 to n, and print each element by arr [i]. For-each input element, check whether Nov 29, 2022 · Method 1 Method 2 Method 3 So let us get started then, Removing Duplicate Elements In Java Array To remove the duplicate elements present in an array and get a unique array, we use multiple methods and procedures. - The inner loop compares it with all the numbers that come after it. asList method Now get the Stream data from List Can you solve this real interview question? Find the Duplicate Number - Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. First program will remove the duplicate elements from a sorted array and the second program will remove the duplicates from unsorted array. If you know how to find duplicate elements in array then this problem is a cake walk, because its nothing but a special case of that problem. May 9, 2025 · Java exercises and solution: Write a Java program to find duplicate values in an array of string values. java ? Jul 24, 2019 · Asked5 years, 9 months ago Modified 5 years, 9 months ago Viewed 2k times 1 This question already has answers here: How do I compare strings in Java? (23 answers) Feb 22, 2020 · 0 I have an array of integers like = 3,1,2,3,1 ; and I just want to count how many duplicates this array has. Jul 1, 2025 · In the first paragraph, I have given you a brief overview of three ways to find duplicate elements from Java array. It's when there are multiple identical elements in a collection. To get frequency of duplicate element/object in String Array : First, convert Arrays to List using Arrays. e. There are multiple way to find duplicate elements in array in java. In this count duplicate array number example, we used a while loop to iterate Dup_Count_arrr array, count duplicate items (item shown more than once), and print the total. Sep 9, 2013 · 4 I have a java class which involves a String array and two for loops for going through the array elements and prints them plus their redundancy in the array as they are Strings . In this guide, we’ll explore a simple yet effective way of Removing Duplicate Elements in Array. util. This article explores various techniques to remove duplicates from an array in Java, including sets, hash maps, and frequency-based approaches. Illustration: Array: {1, 2, 2, Jul 14, 2023 · In Java 8, you can use the Stream API and lambda expression features to find the non-duplicates element from a list. You can also find duplicates by using the Set data structure which returns false if you try to add duplicates. Because each Oct 7, 2024 · When working with collections in Java, a common task is finding duplicate elements. Java Arrays Arrays are used to store multiple values in a single variable, instead of declaring separate variables for each value. Words with no duplicates should be displayed alone The output needs to be like this anps anps anps bbo ehllo I have tried while, for loops but the logic seems impossible. In this approach, we use two for loops (inner and outer loops) to compare an element with each element of an array. For example: Example 1: Suppose we have a given sorted array arr= [10, 20, 30, 30, 30, 40, 50, 50] then Jun 1, 2021 · Java program to find duplicate elements in an array using iteration and comparison logic and by using HashSet. ArrayList supports dynamic arrays that can grow as needed. Using nested for loop :- First we create nested for loop and iterate the elements. Examples: Input: A [] = {1, 1, 2, 3, 3} Output: 2 Explanation: Distinct array elements are {1, 2, 3}. /*Java Proggram to find the repeated elements with Frequency*/ import java. I've got an arraylist called digits : [1, 1, 2, 3, 5, 8, 13, 21, 34, - Java Interview Questions -5, Write java program to find duplicate elements in array in java? 14. Therefore, all you have to do is create a TreeSet and adding all elements to it. In this article, we will learn different methods to copy arrays in Java. Apr 13, 2017 · If it doesn’t contains inside unique List, then add element to unique List Repeat step 3-4, until all elements of Arrays are compared and unique elements are stored inside List Convert unique list into Arrays using toArray () method Again, iterate through Arrays to print unique elements RemoveDuplicateFromArraysUsingList. Jan 21, 2019 · There are many methods through which you can find duplicates in array in java. Java 8 provides an efficient way to remove duplicates from an array using the Stream API. However, in this article, we will learn how to remove duplicates from an array in Java without using a set, in an efficient manner. Non Repeating elements in an Array in Java Here, in this page you will find the code for printing non repeating elements in an array in java programming language We are given with an array and need to print the distinct elements among them. Jul 22, 2025 · Given an array arr [] of integers of size n, where each element is in the range 1 to n and each element can occur at most twice, find all elements that appear twice in the array. We will use ArrayList to provide stream of elements including duplicates. Display the array. println("Duplicate for "+currNumber +" in " +i); break; } } pointer++; } It will print all duplicates for all the numbers in the array. Create a hashMap of type {char, int}. *; public class GFG { Feb 12, 2022 · For finding duplicates, iterate through original List and remove elements by comparing elements in unique list and store into new Set using collect (Collectors. The most important ones are given below: Method 1 In this method, we remove the duplicate elements by using a temporary array. See the code, output and explanation for each example. Jul 5, 2024 · Java Program: The provided Java program utilizes the HashSet class to identify duplicate elements in an array. So if we add the elements in a Set, it automatically discards the duplicate elements while addition itself. Jan 17, 2019 · Print Non-Duplicate Integer Element in Array using Java without using inbuilt methods Asked 6 years, 3 months ago Modified 6 years, 3 months ago Viewed 6k times Can you solve this real interview question? Find All Duplicates in an Array - Given an integer array nums of length n where all the integers of nums are in the range [1, n] and each integer appears at most twice, return an array of all the integers that appears twice. Jan 6, 2025 · 1. Traverse through the array and print all duplicate elements from the array by comparing them to the next element. Can any one help me to solve this problem I need to separate and count how many values in arraylist are the same and print them according to the number of occurrences. Java Program to Count Digits, Letters, Whitespace, and Special Characters in a String How to Find Duplicate Elements in an Array - Java Program | Java Interview Question and Answer #java 6. Approach: Get the stream of elements in which the duplicates are to be found. If elements is equals, then print data s [j]. The given array may contain duplicates and the output should contain every element only once. We will learn this using two different approaches :. In this post, we will learn to find duplicate elements in array in java using Brute Force method, using Sorting method, using HashSet, using HashMap and using Java 8 Streams. So, I would ge Aug 27, 2025 · Remove duplicates from Java arrays in 5 minutes. Find duplicate elements in an array using the sorting method In this method, we are sorting the first using the Arrays. Different ways are explained. LinkedHashSet, Stream API, and manual methods with working code you can copy-paste. Remove Dup Apr 3, 2024 · If your elements are somehow Comparable (the fact that the order has any real meaning is indifferent -- it just needs to be consistent with your definition of equality), the fastest duplicate removal solution is going to sort the list ( 0 (n log (n)) ) then to do a single pass and look for repeated elements (that is, equal elements that follow Jul 15, 2025 · Given an array of integers arr [], The task is to find the index of first repeating element in it i. Dec 26, 2013 · Finding duplicates in an array is a common interview question. Example 1: Input: nums = [1,3,4,2,2] Output Sep 17, 2014 · 1 Your algorithm is flawed in the following way: for every element in the array you look at all the elements after that element and if they happen to be equal, you increase the counter. May 15, 2017 · Here In this array code I have to print non-repeated integer value Say Array value is :- [1,1,2,3,1,2,4,5] answer should be :- [3,4,5] that is non repeated integer value I have to print . HashSet; public Tagged with java, interview. Below is the implementation of the above approach: import java. So, the number of times an element is present in an array, that is called frequency of the element in the array. Dec 31, 2014 · I am stuck in the following program: I have an input integer array which has only one non duplicate number, say {1,1,3,2,3}. But I am bit wonder whether how can I implement it without any Collection or intermediate Array. System. Frequently Asked Java Program 19: How To Find Duplicate Elements in Array SDET- QA 781K subscribers Subscribed You have an array of numbers from 0 to n-1, one of the numbers is removed, and replaced with a number already in the array which makes a duplicate of that number. So, far I have written below code: public static void main (String [] args) { // TODO Auto-generated method stub Aug 9, 2024 · Find Duplicate Elements in Array: In this blog post, we will talk about one of the very famous interview questions, whether you are a refresher or an experienced one. In this blog post, I’ll walk you through various ways to find duplicate elements in a stream using Java, providing explanations and code examples. Let's say I have the following two arrays: int[] a = [1,2,3,4,5]; int[] b = [8,1,3,9,4]; I would like to take the first value of array a - 1 - and see if it is contained in array b. Here is the source code of the Java Program to Find the Elements that do Not have Duplicates. ly/2ZGeBFCHere we will learn a Java program to find duplicate elements of an array. The findDuplicates method iterates through the array, adding each element to a HashSet called seen. Note: It is guaranteed that only one such element exists in the array. the element that occurs more than once and whose index of the first occurrence is the smallest. Solution: Exhaustively search for duplicates in the array. println(Array[i]); Concept: We will be using the toString () method of the Oct 2, 2015 · Here is the code to find duplicate elements using a brute force algorithm in Java: In this program, instead of printing the duplicate elements, we have stored them in a Set and returned from the method, but if the interviewer doesn't ask you to return duplicates, then you can simply print them into the console as I have done in next solution. stream(). Dec 17, 2020 · You can use a HashSet because Sets don't allow duplicates, just loop over array of elements and insert them into a HashSet using the add() method. Granted, this is a fair amount of code in isolation, but it can be reused as an intermediate operation in any stream that needs to operate only on duplicates. Oct 17, 2010 · He's expecting duplicates to be false, but every time there are more than 0 elements in the array, the loop will set duplicates to true. frequency (). count() Is it the best way? Dec 11, 2018 · Create another ArrayList. An array can contain duplicate values as well. Here is the code: package sortingattempt; import java. Set is used to take unique elements Hey viewers,In this video, we will see two approaches for solving this problem Printing the Duplicate Elements in an array. How to print repeated elements only once in Java using only array? [duplicate] Asked 5 years, 1 month ago Modified 5 years, 1 month ago Viewed 4k times Finding duplicate elements in an array is a common problem in Java and other programming languages. input is the array and the output will be number of duplicating elements. Identifying Duplicate Elements in Array in Java The Problem Statement Imagine you have an array with multiple elements, and you need to identify and print the duplicate values. I wanted to print out the duplicate elements in an array. Sep 8, 2023 · Handling duplicates is essential for accurate data processing, analysis, and maintaining the integrity of information. Method 1: Using extra space Below given Java Program is to remove duplicate elements in an Array Using the extra space method: In Java 8, finding duplicate elements in a Stream is easy and efficient using the filter() method and a Set to track previously seen elements. If a match is found, indicating a duplicate, the program will print the duplicate element. May 9, 2025 · Java exercises and solution: Write a Java program to find duplicate values in an array of integer values. Write a Java Program to Count Array Duplicates with an example or how to write a program to find and count the duplicates in a given array. Given an array that may contain duplicates, print all repeated/duplicate elements and their frequencies. If not, then it isn't a duplicate. Follow the steps below to solve the given problem: Traverse array and insert elements and their counts in the hash table. Dec 28, 2014 · This way, each distinct element is passed downstream once it is identified as a duplicate, and no other times. Input : A [] = {1, 1, 1, 2, 2 An array is a way of holding multiple values of a single type together, with some order associated with the values. println Jun 12, 2025 · This makes it easier to count consecutive duplicates in one pass. The second ArrayList contains the elements with duplicates removed. To delete the given element from array you can use third temporary array or by sorting the array and then removing the duplicate elements. Traverse array again and print the first element with a count equal to 1. But Arrays. Sorting helps eliminate the need for extra space like maps or arrays, making the logic clean and space-efficient. This is the Java Program to Find Repeated Elements and the Frequency of Repetition. The problem statement can be defined as follows. Dec 23, 2022 · Find Duplicates Using a HashSet in Java A HashSet is a collection of unique elements. Jul 2, 2024 · Given an array of integers (which may contains duplicate elements), we have to print all duplicate elements of array once. Mar 3, 2024 · Finding Duplicates using java streams Using Set. In this program, the objective is to identify and print the duplicate elements present in an array. Jul 12, 2025 · Given an array arr in Java, the task is to print the contents of this array without using any loop. We will write two java programs in this article. Java Program to find duplicate elements in a Stream Mar 19, 2024 · Removing Duplicate Elements in Array using Java Arrays are fundamental in Java, but duplicate elements can clutter your data. If no duplicates are found after all comparisons, return false. As per the problem statement we have to detect the elements which are repeating in an array and print its frequency. print all elements with order (duplicates are not printed). Let’s see them one by one. Removing duplicate elements from an array is a common task in programming. Which one do you really want? How about this one, only for the sorted Array of numbers, to print the Array without duplicates, without using Set or other Collections, just an Array: public static int[] removeDuplicates(int[] array) { Here is the link of Full Play List https://bit. I’ll provide a step-by-step explanation of the logic used in the program. Step 2: Loop through the array by incrementing the value of the iterative variable/s. This way you only loop over the array once which results in a time and space complexity of O(n). toSet ()) method which results into duplicate list FindDuplicatesUsingDistinctMethod. Reverse String - https://youtu. deepToString() accepts only an Object [] (or an array of classes that extend Object, such as Integer, so it won't work on a primitive array of type int []. Suppose I'm taking an array of size 5 with elements [1,2,5,5,5] This Jul 23, 2025 · Removing duplicate elements from an array is a common operation that can be easily accomplished using sets. Dec 7, 2013 · I am trying to find element that is duplicated in an array. Arraylist implements a dynamic array by extending AbstractList. Aug 14, 2023 · Duplicate elements in an array can lead to inefficiencies in data manipulation and can also skew the accuracy of results. Given an input array, our task is to remove duplicate elements from the array. asList (arr); And then convert List into Set for storing only unique element/objects Now, use static frequency (); method of Collections class by passing converted List and unique element from Set Repeat above step for all unique element/objects present in Set, by iterating Set Finally Dec 18, 2024 · That's all about how to print duplicate characters from String in Java. This task is essential in various applications, such as database management, error checking, and more. The program will not only clean up your data but also showcase Java’s versatility in array manipulation. Jul 11, 2025 · Given an array arr [] containing n integers where each integer is between 1 and (n-1) (inclusive). size() != list. Please refer to the Java tutorial. print all the duplicated elements and 2. Feb 15, 2023 · In this tutorial, we will see “How to find Duplicate Element in an Array using Java 8?”. Oct 12, 2018 · Write a java code to find duplicate elements in array. setText() Demo here. It print the only duplicate elements in array. out. The idea is to initialize another array (say count []) with the same size N and initialize all the elements as 0. Jun 22, 2022 · Learn how to write java programs to find and print the duplicate elements of an int or a String array. Scanner; public class ArraySimi Aug 31, 2025 · Given an integer array arr [], find all the distinct elements of the given array. - If a match is found, we print it as a duplicate. Jul 11, 2025 · Hence, 2 is the first non-repeating element. distinct () method eliminates/removes duplicate from Original Arrays and store into new Arrays using toArray (String []::new) method which results into unique elements in an Arrays For finding duplicates, Create a new List using original Arrays Iterate through new List and remove elements by comparing elements in unique Arrays Jul 4, 2025 · In Java, duplicate elements refer to having the same value or content appearing more than once in a data structure like an array, list, or set. toString(<int array>) works fine for primitive arrays. Dec 24, 2012 · can you sort the array ? that would make the answer much simpler. Additional InfoLink for Duplicate elements in an array can lead to unnecessary data processing and incorrect results in many applications. Jul 19, 2023 · Java provides several ways to find duplicate elements, we will focus mainly on two ways: the first one is by using Set of Java Collection Framework and the other one is by using the built-in method of stream named Collections. First let's see the loop method. Traverse the string, check if the hashMap already contains the traversed character or not. The first loop will select an element from the array, and the second loop will iterate through the remaining elements, comparing each one with the selected element. It is an excellent tool for storing and accessing information when solving problems. Frequency of these elements are {2, 1, 2} respectively. - The outer loop picks a number (like the first 1). Nov 27, 2023 · 2. Pseudo Code: for(int i = 0; i < Array. Aug 18, 2016 · Please look in to the below code. Remove duplicate elements from an array (even it could be unsorted array) and then print the result in a sorted array in Java program with its algorithm. Therefore, it becomes essential to have techniques to remove duplicate elements from an array. Print duplicate elements of array. public class DuplicateArray { public static C program to delete an element from an array, How to print duplicate Elements in ArrayList in Java Tutorial, How to remove the duplicates From String in java? Nov 23, 2018 · 3. The simplest method to remove duplicates from an array is using a Set, which automatically eliminates duplicates. Master efficient techniques for duplicate detection in Java. Java program to print all duplicate elements in an integer array with sample input and output with algorithm explanation. Example: Array: [1,2,3,4,5,5,3] Output: Element—–>Frequency 3—–>2 5—–>2 Problem Solution advertisement Sort the array, and find the frequency of each repeated element and print Mar 5, 2021 · The below program demonstrates how to find the repeated elements in the array using another another. With the introduction of the Stream API in Java 8, performing such operations has become both efficient and elegant. To declare an array, define the variable type with square brackets [ ] : Jun 17, 2024 · In many programming scenarios, finding duplicate elements in an array is a common task. In this blog post, we will walk through a Java program that identifies duplicate elements in an array and Jul 15, 2025 · Since the range of elements in the array is known, hence we could use this sorting technique to improvise the time complexity. Try to solve the given variant of Oct 9, 2020 · A quick and practical guide to remove all duplicate values from Array in java without using Set. FYI, Arrays. Jul 23, 2025 · Given an array A [] consisting of N (1 ? N ? 105) positive integers, the task is to find the only array element with a single occurrence. Below is the implementation of the above idea: Jul 23, 2025 · We simply iterate through the array in reverse order and compare the current and previous element. Jan 25, 2025 · Java program to find duplicate strings in an Array This program provides a simple and efficient way to identify and count duplicate strings in an array. sort() method. The program is successfully compiled and tested using IDE IntelliJ Idea in Windows 7. . Copying Each Element Individually Iterating each element of the given original array and copy one element at a time. 1K Dislike Jul 15, 2025 · Given a string, the task is to write Java program to print all the duplicate characters with their frequency Example: Input: str = "geeksforgeeks" Output: s : 2 e : 4 g : 2 k : 2 Input: str = "java" Output: a : 2 Approach: The idea is to do hashing using HashMap. Nov 3, 2019 · 3 Examples to Print Duplicates from Given Java array As I said, there are multiple ways to find repeating elements in an array, like the brute force way, which requires each number to be compared with every other. Nov 27, 2020 · The frequency of an element in an array is the count of the occurrence of that particular element in the whole array. May 5, 2015 · In java 8, what's the best way to check if a List contains any duplicate? My idea was something like: list. length; i++) System. Count Repeated Elements in Array Using Nested Loops This program example iterates through the array and compares each element with others to count repetitions, using a boolean array to avoid recounting visited elements. Jan 5, 2023 · In Java, Array is a non-primitive data type which stores values of similar data type. Then count the occurrences of each element of the array and update the count in the count []. I want someone help me to print each element (String) one time only even it repeated in the array. Jun 26, 2022 · In this tutorial, you will learn how to write java program to remove duplicate elements in a given array. In order to find duplicates, we are going to use several techniques. Below is the Java example illustrating Sep 26, 2017 · I am trying to write a code which will find the duplicate value in an array. length; i++) { result ^= array[i]; } System. Using Extra Space One approach to remove duplicates from an array is by using extra space. Program: May 9, 2025 · Java exercises and solution: Write a Java program to remove duplicate elements from a given array and return the updated array length. Jul 23, 2025 · Given an array, the task is to remove the duplicate elements from an array. Duplicate for 7 in 6 Duplicate for 7 in 8 Obviously, you'd probably have to concatenate a string and display it at the end of the loop by calling outputResults. Jul 31, 2015 · As a part of the Java interview question paper I have got following issue to solve. Step 3: Print out each element of the array. distinct(). This array may contain duplicate values and the output of our program should be printing only distinct numbers. be/QFxWHs8VG_gBinary Se I have one array String [] array = {anps, anps, anps, bbo, ehllo}; I need to be able to go through the array and find duplicates and print them on the same line. Mar 18, 2016 · You say 1. Apr 22, 2022 · Stream. Apr 3, 2019 · Program to find Unique Array Element We will learn, how to find and print all distinct elements of a given integer array. So far I did Jul 23, 2025 · If any two elements are found to be the same, return true, indicating the array has a duplicate element. java TreeSet doesn't contain duplicate elements. Hi all in this video we will learn find find the duplicate elements in a array in Java and write a programme. tjfmrrojy mqfmzvh yhva oqfcrh atrrbmz abcdni dycah omvxa frjuds zpfth