Case Study 1 final String someString = "Hello World"; try { someString = "Hello"; } catch (RuntimeException e) { someString = "World"; } If we compile this code, we get two errors: Cannot assign a value to final variable ‘someString’ // Line 3 Cannot assign a value to final variable ‘someString’ // Line 5 This,… Read More Why is it not possible to initialize a final variable in a catch block?
I’ve finally gotten around to learning Java and I’m trying to write an interpreter for an esolang. I looked up a few tutorials and wrote this code. import java.nio.file.Path; import java.nio.file.Paths; import java.nio.file.Files; import java.util.Scanner; import java.util.List; import java.util.ArrayList; public class NDBall { public static Scanner scanner = new Scanner(System.in); public static void main(String args[])… Read More ReadAllLines not working and it won't tell me why
I have two lists: private final List<EventTeaserModel> events = new ArrayList<>(); private final List<EventTeaserModel> premiumEventList = new ArrayList<>(); The use case for my method removePremiumEventsFromEvents() is to remove premiumEventList objects from the events List (remove objects with the same path). Here is what I tried and it works. Is there a better way to do… Read More Remove objects from a List based on their path
I have two lists: private final List<EventTeaserModel> events = new ArrayList<>(); private final List<EventTeaserModel> premiumEventList = new ArrayList<>(); The use case for my method removePremiumEventsFromEvents() is to remove premiumEventList objects from the events List (remove objects with the same path). Here is what I tried and it works. Is there a better way to do… Read More Remove objects from a List based on their path
I need to get the date in the following format: YYYYMMDD Have code which outputs below result. [2023-02-13 11:05:03] [SEVERE ] sever message System.setProperty("java.util.logging.SimpleFormatter.format", "[%1$tF %1$tT] [%4$-7s] %5$s %n"); But I wanted to be like this [20230213 11:05:03] [SEVERE ] sever message >Solution : To change the format of the date to YYYYMMDD, you need… Read More How to format logfile in YYYYMMDD format?
I need to implement an operation in my java program. So I have the item, the price of it is 6,00€, but if the user get three of these items I can get a discount of 3,00€. So int quantity = 3; double discount = 3.0; int quantityItem = 3; double priceItem = 6.0; double… Read More Java formula to compute discount dynamically
so I’m trying to create a java program that you chose a version and clicks a button. in my java program, I’m trying to use JPanels to make a type of "next page button" for my program. but whenever I run the program, and I click the button, it instantly crashes/freezes. button code: package main;… Read More why does my java program freezes when i click a button?
Size of char in Java is two bytes. How can I get raw bytes from a char variable? var ch = ‘文’; var b1 = // ? var b2 = // ? >Solution : You can perform bitwise arithmetic on char to access the individual bytes: var b1 = (byte) ch; var b2 = (byte)… Read More Get two raw bytes from a single char
I want to print numbers from 100000 to 1000000 separated by two spaces each side of the number. I want to print 15 columns/ 15 unique numbers per line but for each line it’s printing same number. How to fix this class practicex{ public static void main(String[] args) { pract(); } static void pract(){ for… Read More How not to print the same number for every row, I want different number at every position
I’m making a network call that gives me a list of CoinPriceQueryResult objects: public class CoinPriceQueryResult { private String coinQueryId; private double price; } How can I sort this list into the order of my second list of objects: public class CoinStatus { private String coinQueryId; private int position; } based on the position. List<CoinQueryResult>… Read More How do I sort two lists of different objects based on the int values in the objects of the second list?