Is it possible to go back to the parent-object after applying flatmap() operation, and accumulate parent-objects into a set? I have an UnifiedOfferEntity with set of other entity objects as a field: I would like to filter through fields of the parent-object (UnifiedOfferEntity) like this: And then I would lik…
Tag: set
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 i…
How to add using element to a Collection Set using Streams?
Currently I am adding an element to a Collection Set like this. Is there a way to do this with Streams that does not use Stream.concat()? Answer I would suggest you to remodel the objects, you’re updating User’s favorites outside this should happen within the User class Read this OO Principle, Tel…
I’m getting classcastException , can anybody solve this? [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 8 months ago. Improve this question gett…
Accessing array attributes from other classes with setter/getter
I’m new to Java and was wondering how to access attributes from other classes with setter/getter if they are arrays. Currently, I have one date class that sets a date with parameters for month/day/year. I need to make another class that uses the date class to set a date of hire to store as an attribute,…
Java: join the values of a map containing sets
Consider the following pseudo Map<String, Set<String>>: What is the best way to join the value Sets into a single Set (above example should be [“A”, “B”, “C”, “D”]). The order of the resulting set does not matter. I know that I can to something like …
How to use java stream to convert a List of some class to a list/set of any one property of class?
I have a class I have a list of class student say, List<Student> students whose size is 100. I want to stream id of all the students and save it in a set Set<int>id, one easy way to do it is using a for loop, can someone please tell how the same can be implemented using java stream API. Answer
Duplicate elements being added in a set after I change the value after insertion
I have a set with two distinct objects added to it. After insertion, I change one of the objects in such a way that both the objects are equal (as verified by the overridden equals method in object class). At this point in time I have two duplicate elements in a set. Now I try to add these two duplicate
creating a java lottery program that allows the user to select the number of players
I am creating a lottery program that uses a set to store the numbers. The user inputs their number, and it’s stored in a set, then the computer generates some random number, and this is stored in a different set also. The 2 sets are then compared, and the intersect is taken out. The user can select the …
I need an algorithmic help to convert an input Array object to ArrayList<List> object? [closed]
I need an algorithmic help to convert an input array in Java having this content : {5,6,3,2,4,7} To this format : [[2, 3], [3, 4], [4, 5], [5, 6], [6, 7]].