I am trying to understand Collections and Stream. I have split the sentence below and kept the position of each letter (I ignored space/blank): “Hello Word!” Results: [H, e, l, l, o, , W, o, r, d, !] (charsList) {!=[10], r=[8], d=[9], e=[1], W=[6], H=[0], l=[2, 3], o=[4, 7]} (charsIndex) How can I sort the characters and rebuild my word
Tag: hashmap
Will TreeMap (BST) be able to solve this question in reasonable time?
You are given a list of up to 10^7 chess players and their ratings r in a competition. However, this competition uses a unique form of rating calculations. The task is to determine the rank of a player after a certain point in the competition. During the competition, the following can occur: A player joins the competition late. They are
Not able to inject Map into the object while testing with Mockito
I am trying to test a method of hashMap using Mockito but its not working as expected. My Class My test class Its giving 0L instead of 2L. Answer Only reflection can help with private static field:
The longest Substring without Repeating Characters
I’m starting out on LeetCode, and am currently working on the problem Longest Substring Without Repeating Characters. Given a string s, find the length of the longest substring without repeating characters. Input: s = “abcabcbb” Output: 3 Explanation: The answer is “abc”, with the length of 3. I feel like my approach should work, but for some reason it fails
Deserialize json string with nested array of objects with dynamic key
Given the JSON string I need to convert it to my POJO named TransactionInfo JSON String POJO Additional Note (From comment) After the deserialization, I want to access different keys in the transactionProperties map. If it’s converted into a List<Map<String,String>> then it becomes complex. FYI, the keys are guaranteed to be unique so in the end, I want one single
Search for all po files in a directory and its subdirectories and create a Hashmap containing the filepaths as value and its directory as key
I want to search for all .po files in a directory and add them to a HashMap. My directories looks like the following: How can I represent/search these files with the help of java-Streams and HashMap<String, List<File>>, with en/de/it.po as a List<File> type and the respective directory root of these files dir1subdir-1**subdir-n as a key? I’ve tried the following solution
Converting a class containing a hashmap of non-primitive keys or values to Json
I want to convert a class which contains a Hashmap of non-primitive keys or values to Json using Gson. so I realize that Hashmap keys and values are stored only as Strings when serializing with Gson. so I can’t serialize them. I ran into this solution which should be fine, but I get this error: any idea? EDIT: this is
Print the contents of a HashMap in sorted order according to the Size of each HashMap nested inside the given HashMap
I have a HashMap inside a HashMap. I want to print the elements in the HashMap according to the size of elements in the inner HashMap. So the element with the highest number of elements should print first. I’m new to HashMaps and got stuck. This is the HashMap and how I’m printing it: The output that I’m currently getting:
Tranforming a Map containing Sets into a Map of Set-Sizes [closed]
Closed. This question needs debugging details. It is not currently accepting answers. Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question. Closed last month. Improve this question This is my hash map: How can I get a new HashMap that will
Mapping duplicate values from Map against the keys in which they are found [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 6 months ago. Improve this question What I have is: What I want is: Wherein result contains: Product1 -> Shop1,Shop3 Product2 -> Shop2,Shop4 Here Product1 is found at multiple times in