Question: It is possible to validate the JSON payload of a request body, without specifically writing if statements? Maybe via annotation or configuration? I have a very easy POJO: And a very easy controller class: If I query with a payload such as: Everything is working perfectly fine, very happy. However, if there is a typo: (note the typo on
Java functional programming: create list of object from a different list
I’d like to convert to funcional programming the following method: Someone could show me how can I create an instance of an object based on the current list using functional programming? Thank you Answer You should just use map and collect methods of the stream: Though it would be better to provide better copy constructor in PayrollEntry: Then it is
How would I make a new fraction if a fraction cannot be simplified?
So I’m writing an assignment for my OOP class that asks the user for a number of fractions, then randomly generates that number of fractions. Part of the assignment states that if one of the fractions cannot be simplified then skip it and create a new fraction that can be simplified. However the unreducible fractions still make it through. I
What is the difference between Sealed class and inheritance principle in Kotlin?
I’m new with Kotlin. I’m reading a book and a sealed class is displayed there as an “extension” of Enum. I can’t see the similarity between them. The way I see the things, Sealed class is more related to inheritance, because each class can inherit from it and to add function and properties to it For example: I don’t see
How to best determine whether the date format is MM/dd or DD/mm in java
I have list of files coming and I need to analyze them using java. The date field is read from files as String and I need to parse it in to LocalDatTime. The problem is it is now known that whether the first part of date is month or day. The format in them can be anything but most probably
Toast message inside MutableLiveData.observe() working repeatedly
I have a register form and ı want to show a message to the user based on signed up successfully or not.I store that message in my view model which has a mutable live data object to store that message and observing that object from my activity.My problem is when ı click to the register button first time it works
Setting/changing default Java MaxHeapSize or changing default JVM command settings
I’m using a python script that calls the jvm. Unfortunately, the script doesn’t allow me to pass arguments to the jvm command, so I can’t bump up the max heap size via the Xmx flags. Is there a way to set/change the default MaxHeapSize allowed or set/change default arguments for any jvm calls? JAVA_TOOL_OPTIONS from the answer below worked for
Memory Leak Example -references and objects [closed]
Closed. This question needs debugging details. It is not currently accepting answers. Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question. Closed 2 years ago. Improve this question I have the below method.Suppose i call A.m1() 10,000 times from class B.
check if first array is sorted and if there are consecutive duplicate elements check second array at the index of duplicate elements
We need to check if the first array is sorted, and if there are consecutive duplicate elements, check the second array at the index of duplicate elements. This is my code and output The output I expect is false since a[2]=a[3] and thus we should move to the 2nd array and there b[2]>b[3]. for ex: 1. this should return true
In the Eclipse WindowBuilder editor, the Design tab isn’t showing anything
When I create a jframe within a java project it shows me all the code in the Source part but when I go to Design it shows nothing? Would like some help on how to get the whole interface where you customise the GUI. Answer That’s a known issue of the Eclipse 2020-09 release which is already fixed (see Eclipse