Category: HashMap
Java : How to Remove elements from HashMap while Iterating
In this article we will discuss different ways to remove elements from HashMap while Iterating. Let’s create a HashMap of String as Key and Integer as value and add some elements into it i.e. Advertisements // Create a HashMap of string and int HashMap<String, Integer> wordFreqMap = new HashMap<>(); // Add elements in Map wordFreqMap.put(“this”, …
Java : How to Remove elements from HashMap while IteratingRead More
Java : Creating HashMap by associating multiple values with same Key
In this article we will discuss how to create a HashMap with multiple values associated with same Key in Java. Suppose we want to create a HashMap to keep the track of strings and their occurrences in text. For example. Advertisements “the” occurred at following indexes 1,4,8,12. “at” occurred at following indexes 22, 28, 44 …
Java : Creating HashMap by associating multiple values with same KeyRead More
Java : How to update the value of an existing key in HashMap | put() vs replace()
In this article we will discuss different ways to update the value of an existing key in HashMap in Java. Suppose we have a HashMap of words and their frequency count i.e. Advertisements // Create a Map of words and their frequency count HashMap<String, Integer> mapOfWords = new HashMap<String, Integer>() { { put(“John”, 25); put(“at”, …
Java : How to update the value of an existing key in HashMap | put() vs replace()Read More
Java: How to get all keys by a value in HashMap ? | Search by Value in Map
In this article we will discuss how to search into a Map by value and fetch associated keys to the given value. Suppose we have a map of string and integers i.e. Advertisements HashMap<String, Integer> mapOfWords = new HashMap<String, Integer>() { { put(“John”, 25); put(“at”, 2); put(“from”, 10); put(“is”, 5); put(“the”, 2); put(“hello”, 1); put(“break”, …
Java: How to get all keys by a value in HashMap ? | Search by Value in MapRead More