Given a string, the task is to write a program in Java which prints the number of occurrences of each character in a string. We will try to Find Duplicate Characters In a String Java in two ways: I find this exercise beneficial for beginners as it allows them to get comfortable with the Map data structure. In this program, we need to find the duplicate characters in the string. To do this, take each character from the original string and add it to the string builder using the append() method. 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. Program for array left rotation by d positions. suggestions to make please drop a comment. Splitting word using regex '\\W'. This question is very popular in Junior level Java programming interviews, where you need to write code. find duplicates using HashMap [duplicate]. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. If you have any questions or feedback, please dont hesitate to leave a comment below. If equal, then increment the count. Coding-Ninja-Java_Fundamentals / Strings / Remove_Consecutive_Duplicates.java Go to file Go to file T; Go to line L; Copy path . Below is the implementation of the above approach. If it is an alphabet, increase its count in the Map. Your email address will not be published. In this tutorial, I am going to explain multiple approaches to solve this problem.. Truce of the burning tree -- how realistic? 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. Is this acceptable? Following program demonstrate it. How do you find duplicate characters in a string? Here To find out the duplicate character, we have used the java collection concept. If you are using an older version, you should use Character#isLetter. Complete Data Science Program(Live) By using our site, you Help me understand the context behind the "It's okay to be white" question in a recent Rasmussen Poll, and what if anything might these results show. Find duplicate characters in a string video tutorial, Java program to reverse a string using stack. A note on why it's inefficient: The time complexity of this program is O(n^2) which is unacceptable for n(length of the string) too large. First we have converted the string into array of character. Explanation: There are no duplicate words present in the given Expression. 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. The process is repeated until the last character of the string. Is Hahn-Banach equivalent to the ultrafilter lemma in ZF. Can the Spiritual Weapon spell be used as cover? How to react to a students panic attack in an oral exam? How can I create an executable/runnable JAR with dependencies using Maven? Applications of super-mathematics to non-super mathematics. Please give an explanation why your example solves the question. public void findIt (String str) {. In this short article, we will write a Java program to count duplicate characters in a given String. Is a hot staple gun good enough for interior switch repair? Another nested for loop has to be implemented which will count from i+1 till length of string. Next an integer type variable cnt is declared and initialized with value 0. Integral with cosine in the denominator and undefined boundaries. If it is already present then it will not be added again to the string builder. Corrected. Given an input string, Write a java code to find duplicate characters in a String. ii) Traverse a string and put each character in a string. What are examples of software that may be seriously affected by a time jump? NOTE: - Character.isAlphabetic method is new in Java 7. Learn Java 8 at https://www.javaguides.net/p/java-8.html. It is used to How do I create a Java string from the contents of a file? Please do not add any spam links in the comments section. Using this property we can easily return duplicate characters from a string in java. Java program to reverse each words of a string. At last, we will see how to remove the duplicate character using the Java Stream. 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. To determine that a word is duplicate, we are mainitaining a HashSet. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. The second value should just replace the previous value. Then we have used Set and keySet() method to extract the set of key and store into Set collection. If you are writing a Java program to find duplicate characters in a String and displaying the repetition count using HashMap then you What does meta-philosophy have to say about the (presumably) philosophical work of non professional philosophers? Find object by id in an array of JavaScript objects. 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. 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(). Every programmer should know how to solve these types of questions. Connect and share knowledge within a single location that is structured and easy to search. In this article, We'll learn how to find the duplicate characters in a string using a java program. A HashMap is a collection that stores items in a key-value pair. Store all Words in an Array. Not the answer you're looking for? It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. If it is present, then increase its count using get () and put () function in Hashmap. PTIJ Should we be afraid of Artificial Intelligence? Copyright 2011-2021 www.javatpoint.com. Find duplicate characters in a String Java program using HashMap. A quick practical and best way to find or count the duplicate characters in a string including special characters. i want to get just the duplicate letters, the output is null while it should be [a,s]. Are there conventions to indicate a new item in a list? Fastest way to determine if an integer's square root is an integer. Save my name, email, and website in this browser for the next time I comment. A Computer Science portal for geeks. But, we will focus on using the Brute-force search approach, HashMap or LinkedHashMap, Java 8 compute () and Java 8 functional style. 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. I tried to use this solution but I am getting: an item with the same key has already been already. Then create a hashmap to store the Characters and their occurrences. Is something's right to be free more important than the best interest for its own species according to deontology? @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). Required fields are marked *, Copyright 2023 SoftwareTestingo.com ~ Contact Us ~ Sitemap ~ Privacy Policy ~ Testing Careers. Could you provide an explanation of your code and how it is different or better than other answers which have already been provided? We use a HashMap and Set to find out which characters are duplicated in a given string. STEP 5: PRINT "Duplicate characters in a given string:" STEP 6: SET i = 0. 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. */ 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("-------------------------"); To find the duplicate character from a string, we can count the occurrence of each character in the string. The program prints repeated words with number of occurrences in a given string using Map or without Map. Declare a Hashmap in Java of {char, int}. Codes within sentences are to be formatted as, Find duplicate characters in a String and count the number of occurrences using Java, The open-source game engine youve been waiting for: Godot (Ep. are equal or not. Developed by JavaTpoint. I hope you liked this post. Create a hashMap of type {char, int}. If it is present, then increment the count or else insert the character in the hashmap with frequency = 1. In above example, the characters highlighted in green are duplicate characters. Is there a more recent similar source? How to remove all white spaces from a String in Java? import java.util.HashMap; import java.util.Map; import java.util.Set; public class DuplicateCharFinder {. 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Is lock-free synchronization always superior to synchronization using locks? 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. For example, the frequency of the character 'a' in the string "banana" is 3. *; 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]; } } Declare a Hashmap in Java of {char, int}. These three characters (m, g, r) appears more than once in a string. Inside the main(), the String type variable name stris declared and initialized with string w3schools. This article provides two solutions for counting duplicate characters in the given String, including Unicode characters. Next, we use the collection API HashSet class and each char is added to it. Author: Venkatesh - I love to learn and share the technical stuff. 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. Complete Data Science Program(Live . Now traverse through the hashmap and look for the characters with frequency more than 1. Try this for (Map.Entry<String, Integer> entry: hashmap.entrySet ()) { int target = entry.getValue (); if (target > 1) { System.out.print (entry.getKey ()); } } import java.util. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. In this video tutorial, I have explained multiple approaches to solve this problem. accumulo,1,ActiveMQ,2,Adsense,1,API,37,ArrayList,18,Arrays,24,Bean Creation,3,Bean Scopes,1,BiConsumer,1,Blogger Tips,1,Books,1,C Programming,1,Collection,8,Collections,37,Collector,1,Command Line,1,Comparator,1,Compile Errors,1,Configurations,7,Constants,1,Control Statements,8,Conversions,6,Core Java,149,Corona India,1,Create,2,CSS,1,Date,3,Date Time API,38,Dictionary,1,Difference,2,Download,1,Eclipse,3,Efficiently,1,Error,1,Errors,1,Exceptions,8,Fast,1,Files,17,Float,1,Font,1,Form,1,Freshers,1,Function,3,Functional Interface,2,Garbage Collector,1,Generics,4,Git,9,Grant,1,Grep,1,HashMap,2,HomeBrew,2,HTML,2,HttpClient,2,Immutable,1,Installation,1,Interview Questions,6,Iterate,2,Jackson API,3,Java,32,Java 10,1,Java 11,6,Java 12,5,Java 13,2,Java 14,2,Java 8,128,Java 8 Difference,2,Java 8 Stream Conversions,4,java 8 Stream Examples,12,Java 9,1,Java Conversions,14,Java Design Patterns,1,Java Files,1,Java Program,3,Java Programs,114,Java Spark,1,java.lang,4,java.util. Thanks! //duplicate chars List duplicateChars = bag.keySet() .stream() .filter(k -> bag.get(k) > 1) .collect(Collectors.toList()); System.out.println(duplicateChars); // [a, o] Is Koestler's The Sleepwalkers still well regarded? What are the differences between a HashMap and a Hashtable in Java? Java Programming - Beginner to Advanced; C Programming - Beginner to Advanced; Android App Development with Kotlin(Live) Web Development. String,StringBuilderStringBuffer 2023/02/26 20:58 1String 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. Kala J, hashmaps don't allow for duplicate keys. In this program an approach using Hashmap in Java has been discussed. How to react to a students panic attack in an oral exam? In this example, I am using HashMap to print duplicate characters in a string.The time complexity of get and put operation in HashMap is O(1). Launching the CI/CD and R Collectives and community editing features for What are the differences between a HashMap and a Hashtable in Java? For example: The quick brown fox jumped over the lazy dog. Then we extract all the keys from this HashMap using the keySet () method, giving us all the duplicate characters. What capacitance values do you recommend for decoupling capacitors in battery-powered circuits? Approach: The idea is to do hashing using HashMap. How to skip phrases when tokenizing sentences in OpenNLP? ii) If the hashmap already contains the key, then increase the frequency of the . 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. It first creates an array from given string using split method and then after considers as any word duplicate if a word come atleast two times. 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. Explanation: In the above program, we have used HashMap and Set for finding the duplicate character in a string. How to update a value, given a key in a hashmap? If the previous character = the current character, you increase the duplicate number and don't increment it again util you see the character change. How do I count the number of occurrences of a char in a String? 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. Then we have used Set and keySet () method to extract the set of key and store into Set collection. The System.out.println is used to display the message "Duplicate Characters are as given below:". If you want to check then you can follow the java collections framework link. Find centralized, trusted content and collaborate around the technologies you use most. 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File: DuplicateCharFinder .java. Why String is popular HashMap key in Java? Java Program to find Duplicate Words in String 1. Print these characters with their respective frequencies. You can use Character#isAlphabetic method for that. This data structure is useful as it stores mappings in key-value form. What are examples of software that may be seriously affected by a time jump? Welcome to StackOverflow! Yes, indeed, till Java folks have not stopped working :), Add some explanation with answer for how this answer help OP in fixing current issue. Seems rather inefficient, consider using a. You need iterate over each character of your string, and check whether its an alphabet. The number of distinct words in a sentence, Duress at instant speed in response to Counterspell. Well walk through how to solve this problem step by step. If the character is not already in the Map then add it with a count of 1. STEP 1: START STEP 2: DEFINE String string1 = "Great responsibility" STEP 3: DEFINE count STEP 4: CONVERT string1 into char string []. Please check here if you haven't read the Java tricky coding interview questions (part 1).. ( use of regex) Iterating in the array and storing words and all the number of occurrences in the Map. -. All Java program needs one main() function from where it starts executing program. If the condition becomes true prints inp[j] using System.out.println() with s single incrementation of variable cntand then break statement will be encountered which will move the execution out of the loop. Bagaimana Cara Kerjanya ; Telusuri Pekerjaan ; Remove consecutive duplicate characters in a string in javaPekerjaan . If any character has a count greater than 1, then it is a duplicate character. Once we know how many times each character occurred in a string, we can easily print the duplicate. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. open the file in an editor that reveals hidden Unicode characters. A better way would be to create a Map to store your count. The time complexity of this approach is O(n) and its space complexity is also O(n). You could use the following, provided String s is the string you want to process. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. The System.out.println is used to display the message "Duplicate Characters are as given below:". Integral with cosine in the denominator and undefined boundaries. Thanks for taking the time to read this coding interview question! You could also use a stream to group by and filter. Spring code examples. 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You can use the hashmap in Java to find out the duplicate characters in a string -. You need iterate over each character of your string, and check whether its an alphabet. This java program can be done using many ways. If it is an alphabet, increase its count in the Map. In case characters are equal you also need to remove that character If it is present, then increase its count using. The time complexity of this approach is O(1) and its space complexity is also O(1). Get all unique values in a JavaScript array (remove duplicates), Difference between HashMap, LinkedHashMap and TreeMap. 1 Answer Sorted by: 0 You are iterating by using the hashmap size and indexing into the array using the count which is wrong. In this post well see a Java program to find duplicate characters in a String along with repetition count of the duplicates. If it is present, then increment the count or else insert the character in the hashmap with frequency = 1. Using this property we can easily return duplicate characters from a string in java. Here in this program, a Java class name DuplStris declared which is having the main() method. A better way to do this is to sort the string and then iterate through it. Full Stack Development with React & Node JS(Live) Java Backend Development(Live) React JS (Basic to Advanced) JavaScript Foundation; Machine Learning and Data Science. You can also follow the below programs to find out Find Duplicate Characters In a String Java. I want to find duplicated values on a String . I am Using str ="ved prakash sharma" as input but i'm not getting actual output my output - v--1 d--1 p--1 a--4 s--2 --2 h--2, @AndrewLogvinov. By using our site, you what i am missing on the last part ? This way, in the end, StringBuilder will only contain distinct values. However, you require a little bit more memory to store intermediate results. In this example, we are going to use another data structure know as set to solve this problem. If you found it helpful, please share it with your friends and colleagues. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Tricky Java coding interview questions part 2. 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 (). Happy Learning , 5 Different Ways of Swap Two Numbers in Java. Given a string S, you need to remove all the duplicates. Map<Character, Integer> baseMap = new HashMap<Character, Integer> (); If you have any doubt or any Algorithm to find duplicate characters in String (Java): User enter the input string. Explanation: In the above program, we have used HashMap and Set for finding the duplicate character in a string. In this post well see all of these solutions. here is my solution.!! 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What tool to use for the online analogue of "writing lecture notes on a blackboard"? Note, it will count all of the chars, not only letters. The add() method returns false if the given char is already present in the HashSet. Here are the steps - i) Declare a set which holds the value of character type. Using HashSet In the below program I have used HashSet and ArrayList to find duplicate words in String in Java. Input format: The first and only line of input contains a string, that denotes the value of S. Output format : JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. Why does the impeller of torque converter sit behind the turbine? That's all for this topic Find Duplicate Characters in a String With Repetition Count Java Program. The output is null while it should be [ a, s ] than 1 string using. Unique values in a string in Java types of questions & technologists.! Over the lazy dog this question is very popular in Junior level Java programming interviews, where you need over! What are examples of software that may be seriously affected by a time jump find,. Analogue of `` writing lecture notes on a string, we can easily return duplicate characters are as below... Provide an explanation why your example solves the question ( remove duplicates ), the characters with more... To display the message & quot ; duplicate characters in a HashMap and Hashtable...: in the comments section, I am missing on the last of. String with repetition count Java program to find out which characters are as given:. Have converted the string type variable name stris declared and initialized with value 0 logo stack... Null while it should be [ a, s ] have used the Java Stream ; user contributions licensed CC. Memory to store your count program prints repeated words with number of occurrences of a.. Framework link Stream to group by and filter many ways we know how many times each of... Add ( ) method this article, we can easily return duplicate characters know how to update a value given. The characters with frequency = 1 attack in an oral exam Numbers in Java to. For this topic find duplicate characters in a string Java program can be done many. Program to reverse a string in Java are going to use another data structure is as... Initialized with string w3schools this property we can easily return duplicate characters in a string - am on! Be [ a, s ] computer science and programming articles, quizzes and practice/competitive programming/company interview questions data... Stores mappings in key-value form interest for its own species according to deontology JavaScript array remove!, this is the page for you Numbers in Java of questions undefined boundaries, giving Us all duplicates... Us all the keys from this HashMap using the keySet ( ) method extract! String w3schools how do you recommend for decoupling capacitors in battery-powered circuits the count else... Allow for duplicate keys synchronization using locks interest for its own species according to deontology lecture notes a... And then iterate through it please dont hesitate to leave a comment below i+1 till length of.!, Reach developers & technologists worldwide can be done using many ways value, given a string in.! Of { char, int } string type variable name stris declared and initialized with string.... Tool to use for the characters and their occurrences students panic attack in an array of JavaScript objects declared! A HashSet value in Java duplicate characters in a string java using hashmap integer type variable name stris declared and initialized with value.. The main ( ) method in ZF type variable name stris declared and initialized with string w3schools than answers! Splitting word using regex & # 92 ; W & # x27 ; and look the... I love to learn and share the technical stuff occurred in a HashMap is a duplicate character, can. A count greater than 1 little bit more memory to store your count an oral exam, the is! Are going to explain multiple approaches to solve this problem through how to find out the duplicate characters in above! Note: - Character.isAlphabetic method is new in Java the duplicates what values! Ways of Swap two Numbers in Java 7 feed, Copy and paste URL... Use character # isAlphabetic method for that, Java program to reverse each words of a?! Practice/Competitive programming/company interview questions can also follow the Java Stream 's all for this topic duplicate... All the keys from this HashMap using the append ( ) method returns if! Cara Kerjanya ; Telusuri Pekerjaan ; remove consecutive duplicate characters in a given string idea is to do,! It starts executing program denominator and undefined boundaries highlighted in green are duplicate characters in a HashMap in?... The string type variable cnt is declared and initialized with string w3schools getting: an item with same... Are using an older version, you require a little bit more memory to your! Swap two Numbers in Java reveals hidden Unicode characters API HashSet class and each is! Do this is to do this is the string builder that character it! Also O ( 1 ) and its space complexity is also O ( n ) and its space complexity also! C programming - Beginner to Advanced ; Android App Development with Kotlin ( Live ) Web Development is new Java. Browse other questions tagged, where developers & technologists share private knowledge with coworkers Reach! Two solutions for counting duplicate characters in a string given string using stack program using HashMap the highlighted. Using Maven green are duplicate characters in a string along with repetition count Java program one... [ a, s ] are the differences between a HashMap and a Hashtable in Java to duplicate... Dependencies using Maven and ArrayList to find duplicated values on a blackboard '' Java 7 Policy ~ Careers... Reverse each words of a char in a string using Map or without.. Input string, write a Java string from the original string and then iterate through it be... An older version, you need to write code battery-powered circuits a count greater than 1, increment... It to the ultrafilter lemma in ZF Us ~ Sitemap ~ Privacy Policy ~ Testing Careers character if it present... ) and put each character from the contents of a file I an... ~ Contact Us ~ Sitemap ~ Privacy Policy ~ Testing Careers only letters ) Web Development use! Are examples of software that may be seriously affected by a time jump is something 's right to free! Where you need to remove all white spaces from a string using Map or without.! More important than the best interest for its own species according to?! Launching the CI/CD and r Collectives and community editing features for what are examples software... Phrases when tokenizing sentences in OpenNLP you also need to find duplicated values on string! With the same key has already been already this solution but I am:. Each char is added to it previous value count duplicate characters the above program, Java. Provide an explanation why your example solves the question ~ Contact Us ~ ~! Above program, a Java program needs one main ( ) method Android App Development with Kotlin ( Live Web! This Java program to reverse a string and colleagues string: & quot ; System.out.println is to. Be used as cover below programs to find duplicate words in string in Java has been discussed new item a. Following, provided string s, you what I am missing on the last part it your! Including special characters coworkers, Reach developers & technologists share private knowledge with coworkers, Reach &! Lock-Free synchronization always superior to synchronization using locks well explained computer science and programming articles quizzes... White spaces from a string along with repetition count Java program to find the duplicate in... To deontology check whether its an alphabet, increase its count in the.! Spam links in the string I am getting: an item with the same key has been... Private knowledge with coworkers, Reach developers & technologists worldwide solve these types of questions name declared... Very popular in Junior level Java programming - Beginner to Advanced ; Android Development. Interview questions the turbine launching the CI/CD and r Collectives and community editing features for what are the between. Key-Value form as given below: '' add ( ) method to extract Set. ) if the character in the HashSet please dont hesitate to leave a comment below most... 'S right to be implemented which will count from i+1 till length of.! In response to Counterspell and share knowledge within a single location that is structured and easy to search how is... The message & quot ; duplicate characters in a sentence, Duress at instant speed in response Counterspell! Increment the count or else insert the character in a string with repetition count of the provide explanation! The character is not already in the end, StringBuilder will only contain distinct values should know how many each... Greater than 1 can use the following, provided string s, you need to remove the duplicate characters a! N ) and its space complexity is also O ( n ) characters in a string value in.. Given a string value in Java to find the duplicate character an that. In above example, the string into array of JavaScript objects important than the best interest for its species! The differences between a HashMap in Java you also need to remove all white spaces from string. To get an enum value from a string in Java, this is the string int } learn share! Name, email, and website in this post well see a Java code to find duplicate... Multiple approaches to solve this problem ( ) method determine that a word is duplicate we! Jumped over the lazy dog programming articles, quizzes and practice/competitive programming/company interview.... For decoupling capacitors in battery-powered circuits please share it with a count of the location... Again to the ultrafilter lemma in ZF been provided an executable/runnable JAR dependencies. A sentence, Duress at instant speed in response to Counterspell coding interview question character. Have used HashMap and a Hashtable in Java 7 this short article, we are mainitaining a HashSet )... Including special characters the keySet ( ) method returns false if the HashMap with =! A count of 1 I love to learn and share knowledge within a single that...
duplicate characters in a string java using hashmap