Listener Questions

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Should I use a Listener or Observer?

I have a dropdown box in my gui which shows the contents of an arraylist in another class. new objects can be added to the arraylist elsewhere in

File changed listener in Java

I'd like to be notified when a file has been changed in the file system. i have found nothing but a thread that polls the lastmodified file

Java Listener inheritance

I have a java class which fires custom java events. the structure of the code is the following: public class aevent extends
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onClick does not fire in ReactJS

Function does not fire on click event, on the certain div and everything what is inside it is a functional component, my goal is to put
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DatePickerDialog opens two times

I want to show my date in the edit-text with this format: yyyy-mm-dd. first, when i touch the edit-text of the date then the keyboard is still

Event listeners, JavaScript

How do i make new content show in my dom everytime i click a nav link and delete the old one. i get the content one after another when clicking, i
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