Page 86 | CodeGym online Java course - Help

Gellert Varga
Level 23
Szekesfehervar
Resolved
About null-reference From https://codegym.cc/quests/lectures/questcore.level05.lecture03 : "In the second case, there won't be any compilation errors and void print(String s) will be called, which is somewhat not obvious: public class Cat { public static void print(Object o) { System.out.println(o);
3/7/21
799views
4comments
0
Vincenzo Seggio
Level 28
Question about the task MVC (part 8)
Java Multithreading, Level 4, Lesson 14
Resolved
Where ist the mistake?I do not understand what the validator means with the recommendation The main method's output must include the deleted user (user id 124L) in the "All deleted users" section. Could you help me please?
3/7/21
716views
1comment
0
John
Level 17
Mansfield
Question about the task Drawing a rectangle
Java Syntax, Level 4, Lesson 13
Under discussion
(try this out this is working but not accepted in this exercise idk why)import java.io.*; public class Solution { public static void main(String[] args) throws Exception { //write your code here BufferedReader br = new BufferedReader (new InputStreamReader (System.in)); int m = Integer.parseInt(br.readLine()); int n = Integer.parseInt(br.readLine()); for(
3/7/21
645views
1comment
0
Alexandre Lalancette
Level 41
Quebec
Question about the task Caching
Java Collections, Level 4, Lesson 8
Under discussion
Anyone solved this?I really don't understand what needs to be done here. Did someone successfully solved this?
2/5/20
1396views
4comments
2
Mina Nabil
Level 17
Sydney
Question about the task Robot wars
Java Core, Level 3, Lesson 11
Resolved
Hi, whats wrong with my code? please help Hi, whats wrong with my code? please help
3/4/21
643views
5comments
0
Max
Level 5
Stamford
Question about the task Drawing a rectangle
Java Syntax, Level 4, Lesson 13
Resolved
I need help to find the error I got the characters printed out but not the new line. Need help
2/13/21
640views
2comments
0
Mina Nabil
Level 17
Sydney
Question about the task Fix four mistakes
Java Core, Level 4, Lesson 8
Under discussion
Quick question please answer Just a quick question, when we call the initList(list) on the list parameter, that means that we change the list permanently right ? as when I debug the program, printListValues(list); and processCastObjects(list); get null list as if the initList did not affect the list variable public static void
3/5/21
803views
6comments
0
Anatoly
Level 17
Question about the task Countdown at the races
Java Core, Level 6, Lesson 10
Under discussion
Does anyone can tell me what is wrong with that?Everything is working with 4 and with 3. But Validator doesn't want to accepting it... is anything wrong with that? Any explanation will help.. package com.codegym.task.task16.task1617; /* Countdown at the races */ public class Solution { public static volatile int numSeconds = 3; publ
3/5/21
533views
2comments
0
Liliane Top
Level 24
Amsterdam
Question about the task Reading and writing to a file: CodeGym
Java Core, Level 10, Lesson 2
Under discussion
Miracle!! I pass the test but the console shows an error.1)Something is wrong with my code as it doesn't always save the users to the file. 2) Sometimes it gives an illegalArgumentException due to the new Date(). 3) It also doesn't work when I try to store all users in the StringBuilder and then write it to the file. This part is also confusing. How is th
1/15/21
684views
0comments
0
WIDMO
Level 25
Gdańsk
Question about the task Number algorithms
Java Core, Level 10, Lesson 10
Under discussion
Anyone can help?After few hours on that I have to pass. Can anybody tell me what's wrong with my solution, apart that it simply do not pass? Please. Thanks in advance.
12/23/20
675views
0comments
0
Josephine
Level 1
Normal
Question about the task AutoCloseable and try-with-resources
Java Multithreading, Level 1, Lesson 10
Resolved
Can someone explain what is this error? I am stuck om/codegym/task/task21/task2112/Solution.java:6: error: incompatible types: try-with-resources not applicable to variable type try (FakeConnection fakeConnection = dbConnectionManager.getFakeConnection()) ^ (com.codegym.task.task21.task2112.FakeConnection cann
3/4/21
1530views
2comments
0
Oliver Heintz
Level 18
Mustang
Question about the task Transactionality
Java Core, Level 7, Lesson 10
Resolved
I've never really understood reading files from console I assume I am failing for writing my own shoddy method (fileAdd) and trying to be clever. But I'm not sure why it doesn't work. And my brain has been pummeled by these tasks already, so I'm gonna need some help on this one.
3/1/21
669views
10comments
0
Michał
Level 41
Krakow
Question about the task Inverted words
Java Multithreading, Level 2, Lesson 9
Under discussion
Where's a mistake?Hi, could anyone please help me with that? I don't know what is wrong with my solution. It passes all my examples. Though, I clearly miss something.
9/18/20
578views
3comments
0
Johannes
Level 27
Centurion, Pretoria
Question about the task Inverted words
Java Multithreading, Level 2, Lesson 9
Under discussion
I give up.I have spent literally the WHOLE day on this task. And still cannot pass. How should I tell the "list" that it should allow another occurrence of the same words ? Moving on. No need to frustrate myself further with this task.
4/28/20
1060views
1comment
0
Andrei
Level 41
Question about the task Deserialization
Java Core, Level 10, Lesson 10
Resolved
Please break down this code Three of the requirements are: The getOriginalObject method must return the A object received from the ObjectInputStream. The getOriginalObject method must return null if an A object is not received during deserialization attempts. The getOriginalObject method must return null if an exception is th
2/26/21
922views
7comments
0
Zach
Level 22
Fort Collins
Question about the task Player and Dancer
Java Core, Level 4, Lesson 4
Under discussion
Static variables are so confusing...I am so confused about static variables and why this doesn't work. If someone could explain it to me I would be super grateful. Thanks. package com.codegym.task.task14.task1407; import java.io.BufferedReader; import java.io.InputStreamReader; /* Player and Dancer */ public class Solution {
3/2/21
912views
2comments
0
Aleksandr
Level 22
Moscow
Question about the task John Johnson
Java Core, Level 9, Lesson 11
Resolved
Help please I don`t know what is wrong, i tried to crash it with space before name, after name, different dates, but all works fine and not pass the name test. Can someone help please, with figuer out what i miss?
3/5/21
600views
1comment
0
Ryan Palmer
Level 20
Philadelphia
Question about the task Ten cats
Java Syntax, Level 9, Lesson 11
Resolved
Question about the cat class I feel like I understand the other pieces of this task, but I was curious about the class. Can someone explain what the second two sections are doing? public static class Cat { private String name; public Cat(String name) { this.name = name; } public
3/4/21
856views
3comments
0
Павел Артеменко
Level 41
Krasnodar
Question about the task Let's make the code do something useful!
Java Syntax, Level 9, Lesson 11
Resolved
Please, help.Tested in IDEA with both exist and nonexist input file names, test passed ok. Somehow it failed to pass verification.
4/17/19
2121views
3comments
1
Andrei
Level 41
Question about the task The code won't compile…
Java Syntax, Level 9, Lesson 11
Under discussion
Code exactly like in the solution provided, it doesn't compile and it says there is an infinite loop. What is going on?I don't know what's going on, my code is the same as the solution's yet it won't compile.
11/16/20
630views
6comments
0
Mina Nabil
Level 17
Sydney
Question about the task Fix four mistakes
Java Core, Level 4, Lesson 8
Under discussion
Hi, why its not working ?Hi, why its not working ?
3/4/21
596views
1comment
0
Anatoly
Level 17
Question about the task Stopwatch
Java Core, Level 6, Lesson 7
Under discussion
Why if-else not passing Validator?Can anybody explain why if-else do not passing validator? I do understand it might have less code with Thread.Sleep(1000\owner.getSpeed() But if-else is also looking like correct decision, so what is wrong with that? Any extra explanaition will help,thanks in advance...
3/4/21
543views
2comments
0
Anatoly
Level 17
Question about the task Reading a file
Java Core, Level 3, Lesson 11
Archived
Who can explain?I did the solution with the help of the new feature "download correct solution". Who can explain how it works and what it doing? I tried to run that code in Idea, but there is nothing coming out to console,despite it passing validator - i am stil not fully understand what it doing. Even debuging did
2/22/21
715views
3comments
0
Drzazgen
Level 8
Warsaw
Question about the task Min and max in arrays
Java Syntax, Level 7, Lesson 12
Resolved
Why I can't find max and min? On output i got min and max but sill is one requirements not meet.
2/26/21
970views
6comments
0
Libby
Level 2
Question about the task GCD
Java Core, Level 4, Lesson 8
Resolved
I don't see why my code is not verifying correctly.an exception is thrown if my entered number is 0 or less, and the GCD is right for any values I put in. Can anyone point out my mistake? thank you.
3/4/21
1082views
3comments
0
Anthony Chalk
Level 30
London
Question about the task Arming ourselves to the teeth!
Java Multithreading, Level 5, Lesson 9
Resolved
Please help On line 24 I get the warning: Contents of StringBuilder 'replacement' are updated, but never queried On line 26 I get the warning: Result of 'String.replaceAll()' is ignored Why?
3/4/21
830views
3comments
0
Jurij Thmsn
Level 29
Flensburg
Question about the task GCD
Java Core, Level 4, Lesson 8
Resolved
first and third requirement not met It seems to run - I enter 2 lines on the keyboard and if they are not positive integers, an Exception is thrown - otherwise the GCD is displayed. I am really stuck on this - did I misunderstand the requirements?
3/1/21
730views
8comments
0
Dev
Level 5
Abuja
Question about the task Sorting three numbers
Java Syntax, Level 4, Lesson 6
Resolved
Descending Order I tried running this code on a PC and it works fine. Why doesn't it work on Codegym? It keeps giving me an error message for Arrays.sort(arr);
2/22/21
877views
1comment
0
Nirake_
Level 8
Mumbai
Question about the task Square of a number
Java Syntax, Level 1, Lesson 8
Under discussion
Cant understand it??
5/14/20
929views
4comments
0
Vatsal Patel
Level 15
Naperville
Question about the task Minimum of N numbers
Java Syntax, Level 8, Lesson 11
Under discussion
What am I doing wrong?I am reading from the keyboard to get the N number. Then reading line N times.
5/4/19
1737views
4comments
0

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