Assert that the two lists have the same length. Done Create a list of all names and surnames. Done Is there any better way to do this ? or can the code be reduced? —> I need help. the output : [A, B, C, D, E, F, G, H, I, J, K, L] Answer I assume you don’t need a
Tag: java-stream
Get every nth element of nested lists using Java Streams
Here’s a function that will take a nested ArrayList allLists, an index nth, and return the nth element of every sublist. E.g. for allLists = {{1,2,3}, {4,5,6}, {7,8,9}}, nth = 1, the function will return {2,5,8} I’ve managed to get a version working where I can print it out: How to gather the results into an array? Answer Solved:
Merging instances of objects in a list by attribute
I have an object Person which has firstName, lastName and email I have a list of Person where there are potentially multiple Persons of the same firstName and lastName and I want to merge these by their email address with a delimiter. i.e. Person A = Person B = And I want these to be merged into So as to
What is the difference between Stream.of and IntStream.range?
Please, consider this code: The output will be: Could anyone explain, why output of two streams are different? Answer Well, IntStream.range() returns a sequential ordered IntStream from startInclusive(inclusive) to endExclusive (exclusive) by an incremental step of 1, which means it’s already sorted. Since it’s already sorted, it makes sense that the following .sorted() intermediate operation does nothing. As a result,
Two loops for into stream
I have some String method with two for and if: And I still try to change this implementation to some stream. Is it possible in this case? I’ve tried many options, but I have a problem with indexing (index++;) and then with filter in tableCells By.tagname. I think that is it not possible to change that full method to stream,
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
Java. Best way to split each element of List
How can I optimize this using streams ? Answer split returns the initial string if the delimiter is not found, so there is no need to test for “.” before performing the split:
Check if list elements are a continuous range of integers using java stream API [duplicate]
This question already has answers here: How can I check whether the numbers in the array list are sequential (3 answers) Closed 12 hours ago. Given var ns = List.of(1,2,3,4) How can one check if the list elements are consecutive using java stream API It can be done using the following loop: How can it be done using ns.stream.reduce or
Java Streams return throws error Unexpected return value
I am quite new to Java streams and I am trying to implement a method using the streams but when I try to return the value it’s throwing me the error Unexpected return value. I just wanted to know what am I doing wrong. Following is the return within the Arrays.stream value which is throwing the error: However, if I
How to reduce a limited stream (e.g. an ArrayList) from right in Java?
I would like to convert a list to a self-implemented linked list using reduce. I managed to do that in a reverse order: Output is I think to obtain result in the correct order, I may have to use something like foldRight or reduceRight in other languages. Does java provide anything similar, given that the stream is guaranteed to be