Write a java program to count the number of words in a string using hashmap Jun 9, 2019 · Let’s write a program to count the word in a sentence using java HashMap an implementation class of Map. Example: Iterative approach to counting the occurrences of each character in a String using nested loops. Mar 23, 2018 · Counting words of string using java is a easy using HashMap, where key will become words and value will become number of occurrence of the word, if word already available in the HashMap so increase the value with 1 else add a new word with value 1. Jul 11, 2025 · Given a string, the task is to write a program in Java which prints the number of occurrences of each character in a string. By counting the occurrences of each word and then filtering out those with a frequency greater than 1, the program efficiently finds and displays any duplicates. Sep 22, 2015 · Since the key in the hashmap would have the capitalization, it becomes difficult to query since the combinations of capital and non-capital letters used to find the Good key could increase in complexity as the words grow longer. A string is a class in Java that stores a series of characters enclosed within double quotes. steps -1 :Input string step-2: Split the input string into an array of words step-3: Create a . The length of that array tells us the total number of words. g. Loops and if statements are okay! Output The occurence of every character in the string is 2 r 1 e 2 E 1 i 1 J 1 n 1 o 1 A class named Demo contains the function named ‘count_characters’. In your case you want to map words to counts. If it is whitespace and the next character is a Oct 13, 2025 · Java Program To Calculate Number Of Words In A String – In this article, we will brief in on all the methods to calculate the number of words in a string. Apr 20, 2017 · You are on the right path but you will need to alter the collections storing the data. util. Map is data structure which contains value based on key. One object is used as a key to another object. To count words of the given strings, check whether the character at the current index is a whitespace (' ') or a letter. HashMap package or its superclass. How to write Java Program to count the number of words in a string using HashMap. #java #hashmap #string #countnumbers #fyp Java Program to count the number of words in a string using HashMap. This Java program effectively counts the occurrences of each word in a string using a HashMap. The following java code has been written in multiple ways, if you have any suggestions or queries do leave a comment about number of words in string. The Key in this program is String and the Value in an Integer. By tracking the frequency of each word, the program can display the exact number of times each word appears in the input string. 🚀 Dive into the world of Java programming with our latest tutorial! 🤓 In this comprehensive guide, we'll show you step-by-step how to count the number of words in a string using the powerful Jul 29, 2022 · I want to find Java program to count the occurrence of each character in a string without using Hashmap or array concept Asked 3 years, 3 months ago Modified 1 year, 1 month ago Viewed 5k times Conclusion This Java program effectively identifies duplicate words in a string using a HashMap to track word frequencies. Then we iterate using for loop and inside for loop, we have if-else statement and if HashMap (Hmap) contains a key we add the object to the Hmap. If the character is not counted then use another loop and compare it with the other characters of the string. Examples: Input: str = "GeeksForGeeks" Output: r 1 s 2 e 4 F 1 G 2 k 2 o 1 Input: str = "Ajit" Output: A 1 t 1 i 1 j 1 An approach using frequency [] array has already been discussed in the previous post. Apr 17, 2025 · We are given a String and our task is to write Java programs that count its words. A map maps a set of keys to a set of values - something like mapping names to ages. May 3, 2011 · I was wondering how I would write a method to count the number of words in a java string only by using string methods like charAt, length, or substring. If you want a count for each word then in java this requires a Map. Jul 23, 2025 · HashMap<Key, Value> provides the basic implementation of the Map interface of Java and import java. In the example, the string "One Two Three Four" is split into 4 words. Write a Java Program to count the number of occurrences of each word in a given string using HashMap. This function iterates through the string and checks for the count of every character. HashMap stores the data in (Key, Value) pairs, and accessed by an index of another type (e. an Integer). Get the answers you need, now! Apr 9, 2025 · Increment the count by 1. Explanation: The method split("\\s") breaks the string into an array wherever it finds a space. In this program an approach using Hashmap in Java has been Apr 21, 2019 · Write a Java Program to count the number of words in a string using HashMap. After finishing the comparison, print the character occurrence count one by one. Here, a hashmap is created that will store the character and its count. This example illustrates how to use a HashMap in Java to efficiently count the occurrences of words in a string, showcasing a fundamental technique for text analysis. So start with a map declared like: Map<String, Integer> wordCounts = new HashMap<>(); Then each time you come Mar 15, 2021 · Then we declare the HashMap (which is a part of java’s collection that stores data in (Key, value) pairs). tmssjkf mlqm ecmulj fdo booqaist bopjyqh ireu tyzw jogvan ldn mbhux wvnrq ymiuhx lqjldxs ddyh