I’m trying to write to a text file using the above method by applying the concept of currying. The first lambda expression receives the file path as parameter and the second one takes in a String value that should be written to the text file. The write method receives a BiConsumer argument because data …
Tag: lambda
Using a predefined lambda as an argument in Java [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 11 days ago. Improve this question So i’m trying to pass this test: I’m having a really hard time understanding how…
List of BigDecimal: how to calculate absolute difference between elements not adjacent to Zero value using Java 8 Stream?
I have a list of BigDecimal that could be as elements: I would like to calculate the absolute difference between elements not next to Zero value, in this example difference between 3 and 4, 4 and 5. Expected result should be also of type List<BigDecimal>. Of course, the value of Zero could be in any pos…
Java (latest version) Lambda: replace anonymous inner class by lambda
I have got a class which contains the following: VScode Insider tells me to replace the inner class with lambda, Here is a screenshot if you want to see what I mean, ChangeListener is underline as yellow So I tried to think of ways and couldn’t come up with any since I am not experienced enough, any one…
Where is the parameter in this spring bean comming from
I am new to Spring and need to use the circuit breaker pattern, so I looked at the Spring Cloud Circuit Breaker project and saw this code where is the factory coming from? is it injected? The project where this code came from is here demo cheers, es Answer There is nothing injected. The methods return a new i…
Converting List to TreeMap java lambda
I’m trying to convert a List<String> to a TreeMap<Long, CustomClass> The key is the same as the list items but just parsed to Long, the value is just a call to new CustomClass(). How can I achieve this using lambda functions? the above code errors out, with the following error, Answer For ex…
java.util.concurrent.TimeoutException Error
I am trying to create a function that will receive a stream of strings and it will return a sorted list of strings that meet all of the following criteria: They must contain the pattern The strings length must be equal to or greater than the min length number The strings length must be an even or odd number A…
Java 8 reduce method calls depending on a value
How to optimize method that returns the first non empty value returned of the checkN() methods and prevent the rest method calls and isEmpty() calls: #1 I thought of using stream filter and return first that has value, but it requires to call each check: SOLVED as M A suggested, finalized solution for me was:…
Sorting an arraylist with lambda function isn’t working
I’m trying to use .sort() method with an arraylist. My method public void sortSurname() should sort alphabetically all the objects by their surname, these objects are contained in an arraylist ArrayList<Contact> contacts. Could someone please find the issue with this code? Here is what I’ve …
Is it possible to use the reference operator in conjunction with other operators?
Let’s say we got this class: Is it somehow possible to take the output of the getValue() method and increment it, or do any math with it, but by using the reference operator and not a lambda? What I am looking to achieve is something like this, but with reference operators: If I write something like thi…