Page 50 | CodeGym online Java course - Help

Angel Stefan
Level 23
Sibiu
Question about the task We don't need repeats
Java Syntax, Level 8, Lesson 8
Resolved
I realy don t understand how this solution work I don t see why removeFirstNameDuplicates(Map map) works. Pls, i realy need an explanation! Tk you! public static void removeFirstNameDuplicates(Map map) { map = {"ab"-"ab", "ac"-"ac", "ad"-"ab", "ae"-"ab"...} // let say ArrayList list = new ArrayList<>(); // empty array
25.11.2021
692views
4comments
0
Jomar Tayactac
Level 5
Winnipeg
Question about the task Prices 2
Java Core, Level 8, Lesson 11
Under discussion
Any help would be appreciated.I can't seem to figure out what's causing my code to not verify the 3rd and 4th requirements. Please take a look at my code and recommend what I could try. Thanks in advance.
31.01.2022
456views
5comments
0
Angeget
Level 22
Potsdam
Question about the task Splitting a file
Java Core, Level 8, Lesson 5
Resolved
Please i need some help. I tried it over and over again unfortunately i could not figure out.Please i need some help. I tried it over and over again unfortunately i could not figure out.
19.02.2019
2096views
24comments
0
hidden #10920327
Level 24
Question about the task Triangular array
Java Syntax, Level 6, Lesson 6
Resolved
Good result, still no pass Im getting the result, but still can't pass the verification. Where's the mistake?
31.01.2022
920views
2comments
0
Angel Stefan
Level 23
Sibiu
Question about the task Clew
Java Core, Level 6, Lesson 13
Resolved
I have no idea how to pass with thread4 I don't know how a thread can implement a random interface. I can't do it with an X class obj. Any help will be appreciete, tk you!
30.01.2022
668views
4comments
0
Henrique
Level 41
São Paulo
Question about the task User, loser, coder and programmer
Java Core, Level 4, Lesson 8
Resolved
Output is correct, but failed to pass the last 4 requirements Just don't understand why. Could somebody help?
04.06.2020
863views
7comments
0
Jcode
Level 27
Question about the task Checking the order
Java Syntax, Level 13, Lesson 5
Under discussion
A question A condition of the task is:- If the list is not ordered by increasing string length, then display the index of the first element that violates this order. The list is:- grandfather grandmother father mother son daughter cats dog program car My code displayed index 1 (Grandmother) as it is the first
30.01.2022
469views
4comments
0
Vitalina
Level 20
Question about the task Comparable
Java Core, Level 7, Lesson 10
Resolved
The problem with compareTo method Hi! I have a problem with compareTo method. "Be sure that compareTo method returns different values for different objects". I've already checked in main method it - and I see that compareTo method returns different values for different objects. So what does codegym wants from me? Thanks in advance!
07.09.2021
1018views
9comments
0
Lawson
Level 29
Lagos
Question about the task Refactoring, nested classes
Java Multithreading, Level 3, Lesson 6
Resolved
Pls help.. I don't understand this help
20.09.2020
419views
1comment
0
Justin Smith
Level 41
Greenfield, USA
Question about the task How do I choose the right one?
Java Multithreading, Level 3, Lesson 6
Under discussion
Using the example from the previous lesson doesn't work In the previous lesson, they have the line: Zoo.Mouse mouse = new Zoo.Mouse(); Why isn't the solution: obj = new Solution.TEST(); This won't compile, it says it doesn't know what TEST is.
01.01.2022
397views
4comments
0
Gellert Varga
Level 23
Szekesfehervar
Resolved
Files.move() method and moving directories Oracle API says about this method: " This method may be invoked to move an empty directory. ... When invoked to move a directory that is not empty then the directory is moved if it does not require moving the entries in the directory. ... When moving a directory requires that its entries be mov
29.01.2022
441views
4comments
0
Azja
Level 32
Krakow
Question about the task A convert can easily convert others
Java Multithreading, Level 6, Lesson 2
Resolved
Actually I don't understand this question in all Need help with compare method
30.05.2019
1925views
12comments
1
Sajjad Ahmed
Level 10
Bangalore
Question about the task Longest string
Java Syntax, Level 7, Lesson 6
Under discussion
Task is giving expected result but validation s failing can you help public class Solution { private static ArrayList strings; static int c_len = 0, o_len = 0; public static void main(String[] args) throws Exception { strings = new ArrayList<>(); ArrayList index = new ArrayList<>(); for (int i = 0; i < 5; i++) {
20.01.2022
456views
6comments
0
Sara
Level 23
Maribor
Question about the task Replacing numbers
Java Core, Level 9, Lesson 11
Archived
Help please I have no idea what am I doing wrong. The output is exactly the same as in the example when I test the code. I had to miss something… I tried without the try, catch statements in the main method, but it still doesn't verify. I also tried without the method correctLine(String line) and put all the co
13.07.2019
1902views
3comments
0
Justin Smith
Level 41
Greenfield, USA
Question about the task Snake (part 17)
Java Multithreading, Level 2, Lesson 18
Under discussion
Code seems functionally the same as solution but won't pass validation Pasting it here so you don't have to find it in the attached code: public void move(int x, int y) { SnakeSection head = new SnakeSection(this.getX() + x, this.getY() + y); checkBorders(head); checkBody(head); if(isAlive()) { this.sections.
24.12.2021
409views
1comment
0
Henrique
Level 41
São Paulo
Question about the task Census
Java Syntax, Level 8, Lesson 8
Under discussion
If the KEY must be unique, why does it ask to check if people have the same last name (which is the key)?I was able to solve this task only when I changed the last names (map keys), so they were all different from each other. So why does the task ask to check if people have the same last name, if for the last name to be the same, the key must also be the same? I'm really confused here. Does somebody
11.05.2020
656views
5comments
1
Giorgio Verzicco
Level 26
Cerignola
Question about the task Counting words
Java Core, Level 9, Lesson 5
Resolved
Last task fails even if is correct Tested on a real file, works correctly, but keeps failing "The program must output to the console the number of times the word "world" appears in the file." package com.codegym.task.task19.task1907; /* Counting words */ import java.io.BufferedReader; import java.io.FileReader; import java.io.IO
26.01.2022
548views
2comments
0
LuisRC
Level 39
Gijón
Question about the task LinkedList and ArrayList
Java Syntax, Level 14, Lesson 5
Under discussion
About return statement Hi there, Solving this task I found that in the Object Method there's no return type declaration and that puzzles me. Is it or is not compulsory declare the returning type in a Method? public static Object createArrayList() { //write your code here List arrayList = new ArrayList&l
26.01.2022
646views
1comment
0
TheLordJackMC
Level 39
Princeton
Question about the task Aggregator (part 13)
Java Collections, Level 8, Lesson 15
Under discussion
errors i downloaded the right solution and it matched my original one several times, but every time i run it i gives me this: class, interface, or enum expected. file com/codegym/task/task28/task2810/view/backup.htmlSolution.java, line 1, position 0 class, interface, or enum expected. file com/codegym/task
13.08.2021
533views
2comments
0
Justin Smith
Level 41
Greenfield, USA
Question about the task Refactoring (part 9)
Java Multithreading, Level 5, Lesson 16
Resolved
I deleted a method and need to get it back to pass validation Note: At the time of writing, CodeGym is attaching the wrong task code (for task 2909, which has something to do with cars). I don't know why this is. Other questions on this help page are also showing code for task 2909 but the comments don't seem to reflect that, so I suspect it's a temporary glit
24.01.2022
862views
3comments
0
saurabh
Level 17
Bangalore
Question about the task Display right away
Java Syntax, Level 3, Lesson 3
Under discussion
how to do it in intellij.. I have set up the intellij... it has 3 subfolders under CodeGym Tasks...
07.10.2018
2268views
2comments
0
Anon#10923148
Level 9
Question about the task Quadrants
Java Syntax, Level 3, Lesson 8
Resolved
what is this for?is there any way to explain what kind of problem this solves?
23.01.2022
442views
3comments
0
Brentachii
Level 13
United States of America
Question about the task Calculator
Java Syntax, Level 11, Lesson 4
Resolved
why won't the percentage take my answer when it works?I've tried these several different ways that displayed properly but it won't take it and says it's wrong. any help would be appreciated, thanks.
24.01.2022
804views
7comments
0
Mary Khan
Level 23
Russia
Question about the task Is anyone there?
Java Syntax, Level 6, Lesson 8
Under discussion
Why verification of my code is failed?Why did my code verification fail?
23.01.2022
488views
2comments
0
school
Level 1
Ramsgate
Question about the task Minesweeper (Part 3/16)
Games, Level 0, Lesson 0
Under discussion
memes mems
04.02.2021
439views
0comments
0
Anon#10923148
Level 9
Question about the task Favorite board games
Java Syntax, Level 8, Lesson 2
New
BoardGame class So it seems like in this task we are filling the collection array with 5 different strings. Why do we need code to the BoardGame class?
24.01.2022
443views
0comments
0
Gellert Varga
Level 23
Szekesfehervar
Resolved
Enum StandardOpenOption and StandardCopyOption 1.) Enum StandardOpenOption: What is the difference between CREATE and CREATE_NEW? 2.) import static java.nio.file.StandardCopyOption.REPLACE_EXISTING; Will it import only one static variable? (Till now, I've only ever seen the whole class imported in all cases.) Is it obligatory to use "static
21.01.2022
389views
4comments
0
y-meyer2
Level 28
Germany
Question about the task Synchronized methods
Java Core, Level 7, Lesson 10
Under discussion
Why don´t you need to use volatile on "param" or "sb" ?If you use this class with several threads then the param and sb should also be marked as volatile or am i wrong?? private double param = Math.random(); private StringBuilder sb = new StringBuilder();
23.01.2022
331views
1comment
0
Ajani
Level 16
Jacksonville
Question about the task Five winners
Java Syntax, Level 8, Lesson 11
Under discussion
Just makin sure your aware the sort code needs to able to sort more than just the 20 it asks for.Behold code that one hundred percent solves what it's asking for but doesn't sort arrays of a size different than 20.
23.01.2022
439views
1comment
0
LuisRC
Level 39
Gijón
Question about the task The largest number
Java Syntax, Level 13, Lesson 2
Under discussion
Failed task Hi there, Why my solution has failed to pass the validation?
21.01.2022
488views
6comments
0

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