Hence, we want to save the key-value pairs in a different data structure to sort them based on their value and maintain order. As we know, the key-value pairs stored in a HashMap do not have an order.In the first solution, the key idea is to store each entry of the HashMap in a list and then sort the list and finally store the list elements in a LinkedHashMap. Solution #1: Sorting a HashMap Using a LinkedHashMap We can assume the number of superheroes is at max 106, and all superhero names are unique. If two superheroes have the same strength, we arrange them based on the alphabetical order of their names and hence the above output. For example, let’s say we are given a list of superheroes and their strengths. We are provided a HashMap of key-value pairs, and we are required to sort this HashMap based on its values. The rest of this article is dedicated to solving this problem. It gets tricky when we want to order the key-value pairs of the HashMap based on values. We can also define a custom comparator and assign it to the TreeMap constructor to define our custom ordering of elements. Ordering by key is easy, as Java supports TreeMap, where every key-value pair is inserted into the HashMap by the natural order of keys. Some programming challenges involve ordering elements that are present in a HashMap. Both read and access are O(1) operations. We're just concerned about the speed at which we can read an element and gain access to the value using the element (if it's present in the cache). In caching, we're not concerned with the order of the elements. The behavior of a HashMap can be thought of as a caching mechanism. If a match is found, override the value else, add a new entry to the List. Now, we check if any key present in the entries of the List matches the key.Ħ. If a List is present, we create a new Node and add it to the end of the List otherwise, we create a new list.ĥ. Next, we check if there is a List of nodes present corresponding to the bucket.Ĥ. In the above image, let’s assume the hashcode for IronMan is 002 - it’ll be stored in the second bucket that maintains a pointer to a List, where each node contains a key and its corresponding value.ģ. Using the hashcode, we check in which bucket the key is to be stored. We compute the hashcode for each of the keys being inserted.Ģ.
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