Output: I am just wondering why the output would give the information of all the other Enum types despite the fact I only initialized one enum object (TrafficSignal.GREEN). Answer All the enum’s objects instantiated automatically when class loads You said: despite the fact I only initialized one enum object (…
Why my IF can’t get some of my ArrayList’s indexes?
My idea here is to check whether the elements of my ArrayList start with A, B, C, or with another letter, but for some reason, my IF can’t get some words, such as “Almofada”. Output Answer Your issue is with your for loop. You are incrementing the index ‘i’ on each iteration of t…
Integer.parseInt() and Integer.toString() runtime
Would the runtime of Integer.parseInt(String i) and Integer.toString(int i) both be O(n)? Answer Yes both of them Integer.parseInt(“1000”) and Integer.toString(1000) have time complexity O(N) The internal code of Integer.parseInt(“1000”) reads the the strings char by char and covert to…
SUM(ABOVE) functionality in apache poi or docx4j
I am trying to implement =SUM(ABOVE) function in docx which is used to sum all elements above to tht column. I was able to implement this with apache poi using : This is ok when someone opens the document and it calculates it. But if I need to convert the document without opening it to pdf then this function …
Can I add seconds to current date without using Calendar Library in Java?
I want to get the current time in Java, and now I want to add 15 seconds above the time. Can I do this with a library other than the Calendar library in java? import java.util.Calendar; public …
Updating/Calling JTable rendering when a value is changed MANUALLY/DYNAMICALLY
so i want my JTable to render everytime a value in a variable is changed however this is not taking place, the table is only getting rendered either when I click on it, or move it out of view then back in. Any suggestions? I am using a custom TableCellRender as posted below. I want my table to render everytim…
Program won’t run after a while, and I get this
I have really messed with this one for a while now, and I can’t figure it out. I’m in the process of making an breakout game, but I keep getting this error suddenly: Exception in thread “AWT-…
how to add an object in java lang to the fxml file
im trying to make a game I have made a grid of cells in a java class and another part of the UI in the fxml file but when I run it ide gives: JavaFX Application Thread” java.lang.RuntimeException: …
How can i extract ” ” “from json register in java
I’m working with a java’s library (Gson) to store new Users in a file named “users.json). When i register a new one, my code reads previous data in the file to convert and add with the new data in a List of Users to write the new content to the json file. The problem comes when the previous …
Can’t use FileObserver to Observe Files Inside a Folder
I want to observe if any file/folder is added inside /storage/emulated/0/DCIM/Camera using FileObserver in a service, but it didn’t work. Please tell me if there is anything wrong in my code 🙏. Here is the source code: AndroidManifest.xml I added the uses-permission and service tags: LogWatcherService.j…