I recently made it through to the final round interview for a company in which they dissected the week-long take-home project they assigned me (Angular Spring Boot "Rock, Paper, Scissors" app). The details of the project don’t matter, my question is very specific. At one point in the interview they asked me to demonstrate my… Read More How to use Optional.of() or Stream.of() approach to reduce code

I was going through How to remove a key from HashMap while iterating over it?, but my requirement is bit different. class Main { public static void main(String[] args) { Map<String, String> hashMap = new HashMap<>(); hashMap.put("RED", "#FF0000"); hashMap.put("BLACK", null); hashMap.put("BLUE", "#0000FF"); hashMap.put("GREEN", "#008000"); hashMap.put("WHITE", null); // I wan’t result like below – get All… Read More How to get all keys whose values are null in Java 8 using Map

I’m trying to write this function with java 8 , but i didn’t succeeded. This is my code : private LocalTime getAbsenceParJour(List<test> tests) { LocalTime absenceParJourTime = null; Duration sum = Duration.ZERO; for (test perPrestation : tests) { if (perPrestation.getTypeContactLibre().equalsIgnoreCase("absence")) { Duration duration = Duration.between(perPrestation.getHeureDebut(), perPrestation.getHeureFin()); sum = sum.plus(duration); } } if (sum != null)… Read More How to write expression in java8?

I have a task and I am familiar with Java 8 but actually do not reckon how to do this one: so we have 2 lists , one is Integer, second – String. task: for each value n from integerList select a string from stringList that starts with a digit and has length n; if… Read More How to map list from another list Stream Api

I have run this code in compiler and getting the output as 1 but I don’t understand how it will be 1. Please explain with answer. public class Main { public static void main(String args[]) { int a = 10; int b = 2; System.out.println((a < b) ? a++ : –b); } } >Solution :… Read More I don't understand the logic of code that is given below

I have a string "/p4products/nemis2/filehandlerU/encdv2/work/10098325" which is coming as input from CMD. In this string the "encdv" is the environment name and "2" is the instance ID. Environment name can be either "encdv1","encdv2","encpr1","encpr2" and so on but Instance ID can be "1" or "2" only. I want to extract the instance ID whenever I encounter… Read More How to extract the instance value in the string efficently

I want to round off the value if the decimal point is above 1. For example, 23/10 = 2.3 -> roundoff to 3 11/10 = 1.1 -> roundoff to 2 15/10 = 1.5 -> roundoff to 2 67/10 = 6.7 -> roundoff to 7 1738/10 = 173.8 -> roundoff to 174 How can I do… Read More How to round off value in java

i have simple java 8 example using filter. When i try to filter , getting empty value. class Per { String id; Per(String id) { this.id = id; } public String getId() { return id; } public static void main(String[] args) { List<String> allIds = new ArrayList<>(); allIds.add("1"); allIds.add("2"); allIds.add("3"); allIds.add("4"); List<Per> unavailableItems = new… Read More How to filter and get list using java 8 in java?

I want to segregate duplicates and non duplicates from a list of objects based on property customerId and customerRegistration using java 8 segregate meaning if I have 3 record with same customerId and customerRegistration, first record should add into nonduplicate list and 2 nd 3 record should be add in to duplicate list. I have… Read More segregate duplicates and non duplicates from a list of objects based on property on multiple property in java 8