If it is present, then increase its count using. What are examples of software that may be seriously affected by a time jump? It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. You are iterating by using the hashmapsize and indexing into the array using the count which is wrong. Complete Data Science Program(Live) A better way would be to create a Map to store your count. Find duplicate characters in a string video tutorial, Java program to reverse a string using stack. We solve this problem using two methods - a brute force approach and an optimised approach using sort. Clash between mismath's \C and babel with russian. If you have any questions or feedback, please dont hesitate to leave a comment below. Why are non-Western countries siding with China in the UN? This will make it much more valuable. You could use the following, provided String s is the string you want to process. @SaurabhOza, this approach is better because you only iterate through string chars once - O(n), whereas with 2 for loops you iterate n/2 times in average - O(n^2). Applications of super-mathematics to non-super mathematics. How to get an enum value from a string value in Java. Seems rather inefficient, consider using a. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. open the file in an editor that reveals hidden Unicode characters. If the character is not already in the Map then add it with a count of 1. Then we extract all the keys from this HashMap using the keySet () method, giving us all the duplicate characters. Is something's right to be free more important than the best interest for its own species according to deontology? Now we can use the above Map to know the occurrences of each char and decide which chars are duplicates or unique. There is a Collectors.groupingBy() method that can be used to group characters of the String, method returns a Map where character becomes key and value is the frequency of that charcter. All rights reserved. Java program to reverse each words of a string. A HashMap is a collection that stores items in a key-value pair. Find centralized, trusted content and collaborate around the technologies you use most. Traverse in the string, check if the Hashmap already contains the traversed character or not. Java 8 onward, you can also write this logic using Java Stream API. What factors changed the Ukrainians' belief in the possibility of a full-scale invasion between Dec 2021 and Feb 2022? Use your debugger and step through your code. In case characters are equal you also need to remove that character First we have converted the string into array of character. ii) If the hashmap already contains the key, then increase the frequency of the . How to update a value, given a key in a hashmap? How to remove all white spaces from a String in Java? You can use the hashmap in Java to find out the duplicate characters in a string -. This problem is similar to removing duplicate elements from an array if you know how to solve that problem, you should be able to solve this one as well. Can the Spiritual Weapon spell be used as cover? If the character is not already in the Map then add it with a count of 1. What is the difference between public, protected, package-private and private in Java? i) Declare a set which holds the value of character type. This is the implementation without using any Collection and with complexity order of n. Although the accepted solution is good enough and does not use Collection as well but it seems, it is not taking care of special characters. *; class GFG { static String removeDuplicate (char str [], int n) { int index = 0; for (int i = 0; i < n; i++) { int j; for (j = 0; j < i; j++) { if (str [i] == str [j]) { break; } } if (j == i) { str [index++] = str [i]; } } here is my solution.!! The add() method returns false if the given char is already present in the HashSet. Is lock-free synchronization always superior to synchronization using locks? For each character check in HashMap if char already exists; if yes then increment count for the existing char, if no then add the char to the HashMap with the initial . Then create a hashmap to store the Characters and their occurrences. If it is present, then increase its count using get () and put () function in Hashmap. Does Java support default parameter values? Next, we use the collection API HashSet class and each char is added to it. If you want to check then you can follow the java collections framework link. If equal, then increment the count. Input format: The first and only line of input contains a string, that denotes the value of S. Output format : If you found it helpful, please share it with your friends and colleagues. The set data structure doesnt allow duplicates and lookup time is O(1) . A Computer Science portal for geeks. Show hidden characters /* For a given string(str), remove all the consecutive duplicate characters. rev2023.3.1.43269. Hello, In this post we will see Program to find duplicate characters in a string in Java, find duplicate characters in a string java without using hashmap, program to remove duplicate characters in a string in java etc. How do you find duplicate characters in a string? Full Stack Development with React & Node JS(Live) Java Backend Development(Live) React JS (Basic to Advanced) JavaScript Foundation; Machine Learning and Data Science. Following program demonstrate it. At last, we will see how to remove the duplicate character using the Java Stream. find duplicates using HashMap [duplicate]. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. In HashMap, we store key and value pairs. In this example, we are going to use another data structure know as set to solve this problem. At what point of what we watch as the MCU movies the branching started? //duplicate chars List duplicateChars = bag.keySet() .stream() .filter(k -> bag.get(k) > 1) .collect(Collectors.toList()); System.out.println(duplicateChars); // [a, o] In this tutorial, I am going to explain multiple approaches to solve this problem.. That would be a Map. However, you require a little bit more memory to store intermediate results. So, in our case key is the character and value is its count. Spring code examples. Dealing with hard questions during a software developer interview. The open-source game engine youve been waiting for: Godot (Ep. Splitting word using regex '\\W'. import java.util.HashMap; import java.util.Map; import java.util.Set; public class DuplicateCharFinder {. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. STEP 1: START STEP 2: DEFINE String string1 = "Great responsibility" STEP 3: DEFINE count STEP 4: CONVERT string1 into char string []. In this program an approach using Hashmap in Java has been discussed. Approach 1: Get the Expression. Could you provide an explanation of your code and how it is different or better than other answers which have already been provided? Then this map is iterated by getting the EntrySet from the Map and filter() method of Java Stream is used to filter out space and characters having frequency as 1. If youre looking to get into enterprise Java programming, its a good idea to brush up on your knowledge of Map and Hash table data structures. Using this property we can easily return duplicate characters from a string in java. get String characters as IntStream. The character a appears more than once in a string. Note, it will count all of the chars, not only letters. Then create a hashmap to store the Characters and their occurrences. 1 Answer Sorted by: 0 You are iterating by using the hashmap size and indexing into the array using the count which is wrong. You need iterate over each character of your string, and check whether its an alphabet. How to react to a students panic attack in an oral exam? STEP 5: PRINT "Duplicate characters in a given string:" STEP 6: SET i = 0. We convert the string into a character array, then create a HashMap with Characters as keys and the number of times they occur as values. Thanks :), @AndrewLogvinov. Learn Java 8 at https://www.javaguides.net/p/java-8.html. Using HashSet In the below program I have used HashSet and ArrayList to find duplicate words in String in Java. How to derive the state of a qubit after a partial measurement? The set data structure doesn't allow duplicates and lookup time is O (1) . All duplicate chars would be * having value greater than 1. Dot product of vector with camera's local positive x-axis? Is a hot staple gun good enough for interior switch repair? Why does the impeller of torque converter sit behind the turbine? Find centralized, trusted content and collaborate around the technologies you use most. Reference - What does this error mean in PHP? A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. Program to find duplicate characters in String in a Java, Program to remove duplicate characters in a string in java. Connect and share knowledge within a single location that is structured and easy to search. SoftwareTestingo - Interview Questions, Tutorial & Test Cases Template Examples, Last Updated on: August 14, 2022 By Softwaretestingo Editorial Board. You can use Character#isAlphabetic method for that. Now the for loop is implemented which will iterate from zero till string length. First we have converted the string into array of character. By using our site, you In this post well see all of these solutions. 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If it is an alphabet, increase its count in the Map. Print these characters with their respective frequencies. What capacitance values do you recommend for decoupling capacitors in battery-powered circuits? In above example, the characters highlighted in green are duplicate characters. Please give an explanation why your example solves the question. acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Data Structure & Algorithm-Self Paced(C++/JAVA), Android App Development with Kotlin(Live), Full Stack Development with React & Node JS(Live), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Java program to count the occurrence of each character in a string using Hashmap. How do I count the number of occurrences of a char in a String? Integral with cosine in the denominator and undefined boundaries. By using our site, you from the String so that it is not counted again in further iterations. Mail us on [emailprotected], to get more information about given services. We will discuss two solutions to count duplicate characters in a String: HashMap based solution Java 8, functional-style solution In given Java program, we are doing the following steps: Split the string with whitespace to get all words in a String [] Convert String [] to List containing all the words. You could also use a stream to group by and filter. HashMap<Integer, String> hm = new HashMap<Integer, String> (); With the above statement the system can understands that we are going to store a set of String objects (Values) and each such object is identified by an Integer object (Key). JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. Was Galileo expecting to see so many stars? Given a string S, you need to remove all the duplicates. Then we extract all the keys from this HashMap using the keySet() method, giving us all the duplicate characters. A better way to do this is to sort the string and then iterate through it. NOTE: - Character.isAlphabetic method is new in Java 7. The statement: char [] inp = str.toCharArray(); is used to convert the given string to character array with the name inp using the predefined method toCharArray(). In this video tutorial, I have explained multiple approaches to solve this problem. For example, "blue sky and blue ocean" in this blue is repeating word with 2 times occurrence. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. A Computer Science portal for geeks. If count is greater than 1, it implies that a character has a duplicate entry in the string. 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Program for array left rotation by d positions. Launching the CI/CD and R Collectives and community editing features for How to count and sort letters in a string, Using Java+regex, I want to find repeating characters in a string and replace that substring(s) with character found and # of times it was found, How to add String to Set that characters doesn't repeat. This cnt will count the number of character-duplication found in the given string. Now traverse through the hashmap and look for the characters with frequency more than 1. I want to find duplicated values on a String . Thats the reason we are using this data structure. 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If the character is already present in a set, it means its a duplicate character. Is Koestler's The Sleepwalkers still well regarded? asked to write it without using any Java collection. Thanks! You can also achieve it by iterating over your String and using a switch to check each individual character, adding a counter whenever it finds a match. can store each char of the String as a key and starting count as 1 which becomes the value. Is this acceptable? Is a hot staple gun good enough for interior switch repair? Java program to find duplicate characters in a String using HashMap If you are writing a Java program to find duplicate characters in a String and displaying the repetition count using HashMap then you can store each char of the String as a key and starting count as 1 which becomes the value. The System.out.println is used to display the message "Duplicate Characters are as given below:". HashMap but you may be To find the frequency of each character in a string, we can use a HashMap in Java. Java Program to Count Duplicate Characters in a String Author: Ramesh Fadatare Java Programs String Programs In this quick post, we will write a Java Program to Count Duplicate Characters in a String. Any character which appears more than once in a string is a duplicate character. If you are not using HashMap then you can iterate the passed String in an outer and inner loop and check if the characters Copyright 2011-2021 www.javatpoint.com. Here To find out the duplicate character, we have used the java collection concept. Every programmer should know how to solve these types of questions. Is there a more recent similar source? are equal or not. Technology Blog Where You Find Programming Tips and Tricks, //Find duplicate characters in a string using HashMap, //Using set find duplicate letters in a string, //If character is already present in a set, Find Maximum Difference between Two Elements of an Array, Find First Non-repeating Character in a String Java Code, Check whether Two Strings are Anagram of each other, Java Program to Find Missing Number in Array, How to Access Localhost from Anywhere using Any Device, How To Install PHP, MySql, Apache (LAMP) in Ubuntu, How to Copy File in Linux using CP Command, PHP Composer : Manage Package Dependency in PHP. Learn Java programming at https://www.javaguides.net/p/java-tutorial-learn-java-programming.html. ( use of regex) Iterating in the array and storing words and all the number of occurrences in the Map. If you are not using HashMap then you can iterate the passed String in an outer and inner loop and check if the characters are equal or not. If it is present, then increment the count or else insert the character in the hashmap with frequency = 1. Traverse the string, check if the hashMap already contains the traversed character or not. Is Hahn-Banach equivalent to the ultrafilter lemma in ZF. */ for(Character ch:keys) { if(map.get(ch) > 1) { System.out.println("Char "+ch+" "+map.get(ch)); } } } public static void main(String a[]) { Details obj = new Details(); System.out.println("String: BeginnersBook.com"); System.out.println("-------------------------"); The solution to counting the characters in a string (including. 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We use a HashMap and Set to find out which characters are duplicated in a given string. I tried to use this solution but I am getting: an item with the same key has already been already. Create a hashMap of type {char, int}. In the last example, we have used HashMap to solve this problem. Complete Data Science Program(Live . To find the duplicate character from a string, we can count the occurrence of each character in the string. If you are writing a Java program to find duplicate characters in a String and displaying the repetition count using HashMap then you This way, in the end, StringBuilder will only contain distinct values. How can I find the number of occurrences of a character in a string? What does meta-philosophy have to say about the (presumably) philosophical work of non professional philosophers? Then we have used Set and keySet () method to extract the set of key and store into Set collection. How do I efficiently iterate over each entry in a Java Map? You can use Character#isAlphabetic method for that. what i am missing on the last part ? @RohitJain Sure, I was writing by memory. Are there conventions to indicate a new item in a list? Coding-Ninja-Java_Fundamentals / Strings / Remove_Consecutive_Duplicates.java Go to file Go to file T; Go to line L; Copy path . you can also use methods of Java Stream API to get duplicate characters in a String. But, we will focus on using the Brute-force search approach, HashMap or LinkedHashMap, Java 8 compute () and Java 8 functional style. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. These are heavily used in enterprise Java applications, so having a strong understanding of them will give you a leg up when applying for jobs. Iterate over List using Stream and find duplicate words. Copyright 2020 2021 webrewrite.com All Rights Reserved. We can remove the duplicate character in the following ways: This problem can be solved by using the StringBuilder. Book about a good dark lord, think "not Sauron". already exists, if yes then increment the count (by accessing the value for that key). Check whether two Strings are Anagram of each other using HashMap in Java, Convert String or String Array to HashMap In Java, Java program to count the occurrences of each character. How can I create an executable/runnable JAR with dependencies using Maven? Thanks for taking the time to read this coding interview question! Using streams, you can write this in a functional/declarative way (might be advanced to you), Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. In this post well see a Java program to find duplicate characters in a String along with repetition count of the duplicates. This data structure is useful as it stores mappings in key-value form. Please use formatting tools to properly edit and format your question/answer. Thanks! Not the answer you're looking for? We will use Java 8 lambda expression and stream API to write this program. If your string only contains alphabets then you can use some thing like this. The process is repeated until the last character of the string. public static void main(String[] args) {// TODO Auto-generated method stubString s="aaabbbccc";s=s.replace(" ", "");char[] ch=s.toCharArray();int count=1;int match_count=1;for(int i=0;i<=s.length()-1;i++){if(ch[i]!='0'){for(int j=i+1;j<=s.length()-1;j++){if(ch[i]==ch[j]){match_count++;ch[j]='0';}else{count=1;}}if(match_count>1&& ch[i]!='0'){System.out.println("Duplicate Character is "+ch[i]+" appeared "+match_count +" times");match_count=1;}}}}, Java program to find duplicate characters in a String without using any library, Java program to find duplicate characters in a String using HashMap, Java program to find duplicate characters in a String using Java Stream, Find duplicate characters in a String wihout using any library, Find duplicate characters in a String using HashMap, Find duplicate characters in a String using Java Stream, Convert String to Byte Array Java Program, Add Double Quotes to a String Java Program, Java Program to Find First Non-Repeated Character in a Given String, Compress And Decompress File Using GZIP Format in Java, Producer-Consumer Java Program Using ArrayBlockingQueue, New Date And Time API in Java With Examples, Exception Handling in Java Lambda Expressions, Java String Search Using indexOf(), lastIndexOf() And contains() Methods. Program to Convert HashMap to TreeMap in Java, Java Program to Sort a HashMap by Keys and Values, Converting ArrayList to HashMap in Java 8 using a Lambda Expression. Given an input string, Write a java code to find duplicate characters in a String. What tool to use for the online analogue of "writing lecture notes on a blackboard"? This question is very popular in Junior level Java programming interviews, where you need to write code. In this video, we will write a Java Program to Count Duplicate Characters in a String.We will discuss two solutions to count duplicate characters in a String. Store all Words in an Array. Integral with cosine in the denominator and undefined boundaries. The program prints repeated words with number of occurrences in a given string using Map or without Map. Then we have used Set and keySet() method to extract the set of key and store into Set collection. Without further ado, let's dive into the 5 more . Developed by JavaTpoint. Algorithm to find duplicate characters in String (Java): User enter the input string. *; public class JavaHungry { public static void main( String args []) { // Given String containing duplicate words String input = "Java is a programming language. Declare a Hashmap in Java of {char, int}. i want to get just the duplicate letters, the output is null while it should be [a,s]. For example, the frequency of the character 'a' in the string "banana" is 3. Cari pekerjaan yang berkaitan dengan Remove consecutive duplicate characters in a string in java atau merekrut di pasar freelancing terbesar di dunia dengan 22j+ pekerjaan. Save my name, email, and website in this browser for the next time I comment. The steps are as follows, i) Create a hashmap where characters of the string are inserted as a key, and the frequencies of each character in the string are inserted as a value.|. Java Program to find Duplicate Words in String 1. The difficulty level for this question is the same as questions about prime numbers or the Fibonacci series, which are also popular among junior programmers. Inside the main(), the String type variable name stris declared and initialized with string w3schools. A Computer Science portal for geeks. File: DuplicateCharFinder .java. Below is the implementation of the above approach: Remove all duplicate adjacent characters from a string using Stack, Count the nodes of a tree whose weighted string does not contain any duplicate characters, Find the duplicate characters in a string in O(1) space, Lexicographic rank of a string with duplicate characters, Java Program To Remove All The Duplicate Entries From The Collection, Minimum number of operations to move all uppercase characters before all lower case characters, Min flips of continuous characters to make all characters same in a string, Make all characters of a string same by minimum number of increments or decrements of ASCII values of characters, Modify string by replacing all occurrences of given characters by specified replacing characters, Minimize cost to make all characters of a Binary String equal to '1' by reversing or flipping characters of substrings. Of a duplicate characters in a string java using hashmap already exists, if yes then increment the count by... Full-Scale invasion between Dec 2021 and Feb 2022 string s is the character and value pairs Copy... In a string presumably ) philosophical work of non professional philosophers for its own species to! The possibility of a char in a Java, program to reverse each words of a character has duplicate. Store into set collection inside the main ( ) method, giving us the... The Map then add it with a count of the string to deontology to store your count error. By memory good dark lord, think `` not Sauron '' an with... Array and storing words and all the keys from this HashMap using the keySet ( ) method false..., Java program to reverse each words of a qubit after a partial measurement then create a is! Thats the reason we are going to use for the characters and their occurrences Test Cases Template examples, Updated... To implement a way to do this is to sort the string as a key and store into set.. All white spaces from a string along with repetition count of the string as a in. Through the HashMap already contains the traversed character or not for its species. A good dark lord, think `` not Sauron '' like this our website siding with in... String s, you need iterate over each entry in a HashMap to store count! A-143, 9th Floor, Sovereign Corporate Tower, we are using this structure!, in our case key is the string and then iterate through.... I efficiently iterate over each character in the possibility of a char in HashMap... Is new in Java of { char, int } affected by a time jump the technologies you most! Declared and initialized with string w3schools is repeated until the last character of your code how!, Sovereign Corporate Tower, we have used HashMap to solve these types of Questions for: Godot (.! Already exists, if yes then increment the count ( by accessing value... How do I efficiently iterate over each character in a Java program to find duplicate characters there duplicate characters in a string java using hashmap indicate! String as a key and starting count as 1 which becomes the value of.! Not only letters mappings in key-value form given services starting count as which! Ways: this problem given a key and store into set collection comment! Free more important than the best browsing experience on our website allow duplicates lookup! Ways: this problem words of a char in a string, int } regex & # ;... Oral exam of `` writing lecture notes on a blackboard '' also need to remove that character First have! Key, then increment the count ( by accessing the value of character doesnt. Work of non professional philosophers collections framework link solution but I am getting: an item with the key! With China in the string into array of character philosophical work of non professional philosophers format... Character has a duplicate character from a string in Java has been discussed use cookies to ensure have. Floor, Sovereign Corporate Tower, we have used HashSet and ArrayList find... A way to do this is to sort the string as a key in a JavaScript (... As cover character in the HashSet be [ a, s ] ), difference between,. An optimised approach using HashMap in Java to find out the duplicate characters in string.,.Net, Android, Hadoop, PHP, Web Technology and Python [ emailprotected,... Value for that HashMap of type { char, int } well see a Java code find. To write code to extract the set data structure of software that may be to find duplicate.. To react to a students panic attack in an oral exam: this problem can solved. Public, protected, package-private and private in Java 7 file Go to Go! Or not a count of 1 increase its count in the HashMap already contains the traversed or... Chars, not only letters @ RohitJain Sure, I was writing memory... Declare a HashMap is a collection that stores items in a string dot product of vector with camera 's positive... Not already in the given char is already present in the UN been discussed better way do! Comment below a Stream to group by and filter Hahn-Banach equivalent to the ultrafilter lemma in ZF ) method extract. S is the character is already present in a string in Java int } over. Chars would be * having value greater than 1 ; public class DuplicateCharFinder { ], to get duplicate in! Already been provided, not only letters during duplicate characters in a string java using hashmap software developer interview Stream API write! You in this browser for the online analogue of `` writing lecture notes on a blackboard '' [ emailprotected,! The following, provided string s, you from the string you want to check then can. Your code and how it is present, then increase its count get! Can the Spiritual Weapon spell be used as cover is the difference between public, protected package-private... To be free more important than the best interest for its own species according deontology... Well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview.... Efficiently iterate over each entry in a string is present, then increase its.... Reveals hidden Unicode characters non professional philosophers the following ways: this problem ' belief in the denominator undefined... Superior to synchronization using locks softwaretestingo Editorial Board string in Java to find duplicate characters in string in Java {... Coding interview question the StringBuilder a string, we use cookies to ensure you any. Questions, tutorial & Test Cases Template examples, last Updated on: August 14 2022! Analogue of `` writing lecture notes on a blackboard '' characters are equal you also need to write code Spiritual... Blue ocean & quot ; of your string, and website in this post well see all the! \C and babel with russian content and collaborate around the technologies you use.! The characters and their occurrences this browser for the next time I comment a given string duplicate characters in a string java using hashmap & ;... To indicate a new item in a given string ( Java ): User the... The state of a character in the Map then add it with a count of 1 Java been! Should be [ a, s ] over each character of the string into array of character type JAR dependencies. Add it with a count of 1 over each character of the string want to check you... Little bit more memory to store intermediate results and paste this URL your... It should be [ a, s ] email, and check whether its an alphabet can easily duplicate... Having value greater than 1 game engine youve been waiting for: Godot Ep. Code to find duplicate words in string ( str ), difference between HashMap, can! Value for that HashMap using the keySet ( ) method, giving us all number! Case characters are duplicated in a string in Java 7 alphabets then you can the. Your code and how it is present, then increase the frequency of the string into array of.! Show hidden characters / * for a given string the given char is added to it corresponding! Variable name stris declared and initialized with string w3schools more than once in a video... Count which is wrong Map then add it with a count of chars... Write it without using any Java collection something 's right to be free important! However, you can use character # isAlphabetic method for that key ) HashSet class each... With frequency = 1 number of occurrences in the possibility of a character has duplicate! Has already been provided, please dont hesitate to leave a comment below java.util.Set. Website in this video tutorial, I have used set and keySet )... Of each char is already present in the HashSet I create an executable/runnable with. Some thing like this doesnt allow duplicates and lookup time is O ( 1 ) Corporate Tower, are... To know the occurrences of a character has a duplicate character from a string data! Like this impeller of torque converter sit behind the turbine, provided string s you... String w3schools import java.util.Map ; import java.util.Map ; import java.util.Map ; import java.util.Set ; public class {!: - Character.isAlphabetic method is new in Java 7 interview question this data structure know as to... Converter sit behind the turbine can store each char of the chars, not only letters with. If you want to find out the duplicate character { char, int } more... Consecutive duplicate characters in a given string popular in Junior level Java programming interviews where... The add ( ) method to extract the set data structure is useful it... Repeating word with 2 times occurrence, check if the HashMap and set to solve this problem can be by... Create an executable/runnable JAR with dependencies using Maven string: & quot ; greater than 1 solve problem! If your string only contains alphabets then you can also use methods of Java Stream API force approach and optimised! Have explained multiple approaches to solve this problem java.util.HashMap ; import java.util.Map ; import java.util.Map ; import java.util.Map ; java.util.Set... An item with the same key has already been already or not process is repeated until the last of... Character using the Java collection concept also use methods of Java Stream API get!

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