Javers – comparison String, Collection and Boolean with defined rules

I have 2 classes: @Data @Builder public class Boss { private String name; private List subordinates; } @Data @Builder public class Employee { private String …

How to Avoid nested for Loops in java to get the heirarchical data?

// This method will return the list of reference names, in this method I wrote the code using nested //for-loops this handle only 3 subfolders set what if there is one more subfolder and how to handle …

ConcurrentModificationException when iterate through ImmutableMap.copyof()

Currently, I have a problem when I frequently iterating through a HashMap (1-time per second) I add new element to the map on the main thread and iterate the map on the other thread I return an …

Trying to sort a Double Collection

I am trying to sort a Collection. I cant seem to get my code to work with what I have found online. Collection: [104.131119, 104.188937, 93.174548, 100.533096, 97.902247, 98.608619, 93.380054, 106….

Best way to sort customerAddress in such a way that all primary address are at the top and others at the bottom

I am trying to sort the below list in such a way that primary address is at the top of the list followed by other address (p.getIsPrimary is a Boolean value and can be null). Is there any other way …

Java 8 Remove 1 List from Other

I have two list of different Objects. class School { private String schoolName; private String location; private String pinCode; private String rating; } class World { private …

Sort List of Strings by Characters In Java

I am trying to write a program to order a list of strings by most least frequent characters within the list. For example, if the list was [apple, orange, banana] the letter frequency within the list …

Transform List into Map using only two keys and odd or even list indexes as values – Java 8 Stream

I would like to transform list into map using as key values only two string values. Then as values just list of strings containing elements from odd or even index positions from input list. Here is …

List.of() or Collections.emptyList()

As an special case of List.of(…) or Collections.unmodifiableList() – what is the preferred Java 9 way of pointing to an empty and immutable list? Keep writing Collections.emptyList(); or switch …

How do I keep the iteration order of a List when using Collections.toMap() on a stream?

I am creating a Map from a List as follows: List strings = Arrays.asList(“a”, “bb”, “ccc”); Map map = strings.stream() .collect(Collectors.toMap(Function….