I have an array of arrays of two strings. How can I collect the above array into a Map<String, Set<String>> whose key is the first element of each array and the value is a set of second elements of the array? So that I get following map? So far, I found I can classify the first element of each array
Tag: collectors
Zipped String from 2 (or more) Strings – “AB” + “YZ” = “AYBZ”
So I am trying to return another String from 2 input sentences zipped together. If the 2 sentences are identical in length it will produce an actual output. If the two input sentences are not identical in length then it will just return an empty string. Here is my code so far but I can’t figure out how to zip
How to extract values from a list of class objects, remove the duplicates and sort alphabetically?
I have a class Tag in java public class Tag { private int excerptID; private String description; } and I am extracting descriptions from a list of Tag objects rawTags to a set (I need to …
Convert list of integer into comma separated string?
I was trying to convert list of Integers into String of comma separated integers. Collectors.joining(CharSequence delimiter) – Returns a Collector that concatenates the input elements, separated by …
extract list inside a list as a single list
I’ve a two POJOs, Sample code below Controller class This returns me a list of the list: but what I want is a single list like How can I do that with Java 8 streams? I’ve tried flatMap also, but that doesn’t go well with the Object datatype of entries. Answer Consider a List<String> as a field entries in the
Hashmap with Streams in Java 8 Streams to collect value of Map
Let consider a hashmap I inserted some values into both hashmap. For Example, Q1) Now I want to apply a filter condition on the key in hashmap and retrieve the corresponding value(List). Eg: Here My query is key=1, and output should be ‘list1’ I wrote But I don’t know how to retrieve as a list as output of this stream