CodeGym online Java course - Help

eliradelorca
Level 1
Under discussion
Why does my Java for-loop skip elements after removing items from an ArrayList?Hi everyone, I'm learning Java collections and ran into an issue when removing elements from an ArrayList inside a for-loop. Example: ArrayList numbers = new ArrayList<>(); numbers.add(1); numbers.add(2); numbers.add(3); numbers.add(4); for (int i = 0; i < numbers.size(); i++) { if
6/13/26
12views
2comments
0
MoJo
Level 23
Cairns
Question about the task Number algorithms
Java Core, Level 10, Lesson 10
Resolved
I'm not sure if i understood the task correctly So i thought it works for me but it doesn't let me pass. Looking at various internet sides etc. it seems that some people do not think 3-9 are so called Armstrong numbers: https://pages.mtu.edu/~shene/COURSES/cs201/NOTES/chap04/arms.html My output: 4 [1, 2, 3, 4, 5, 6, 7, 8, 9, 153, 370, 371, 407]
2/24/21
984views
6comments
0
Maven
Level 17
United States of America
Question about the task Filling an array
Java Syntax, Level 6, Lesson 8
Resolved
I am filling the array according to the specifications. What is wrong here?The error message is too general. My solution is filling the even and odd arrays according to the specifications. I'm not sure what I'm missing here.
3/6/22
1345views
12comments
2
David
Level 1
Paris
Question about the task Pythagorean Multiplication Table
Python Core, Level 4, Lesson 5
Under discussion
la solution proposée ne marche pas Même la solution proposée est en erreur au niveau de : The program should output only the numbers of the table, formatted as an N x N table.
4/4/26
56views
3comments
0
Paul
Level 24
Vienna
Question about the task Deep cloning of a map
Java Multithreading, Level 1, Lesson 8
Under discussion
What does actually happen in the clone() method?I don't think I understand this topic even after doing some reading on it. I will try to describe as good as I can what I think happens in my code. If you can see the mistake, I would be grateful for any hints. As far as I understand after clone() in the main method is called, the solution.clone()
12/9/22
878views
4comments
0
Edddieg
Level 15
Providence
Question about the task Don't think about seconds…
Java Syntax, Level 3, Lesson 8
Resolved
please help Write code that calculates how many seconds have passed since 3:00 PM when the clock says it's 3:30 PM. Display the result. Requirements: • The program should output text. • The displayed text should be a positive integer. • The displayed number must be a multiple of 60. • The displayed number must
6/7/20
1022views
6comments
0
Hayden
Level 3
Rockville
Question about the task Negative
Python Core, Level 2, Lesson 6
Under discussion
how do I indent?^
6/7/26
12views
1comment
0
Amjad Ali
Level 2
Dadu
Under discussion
java this keyword why we use this keyword in java to say this function (attributes) are called by particular object. on the other hand it can be done without using this keyword.🤔
3/17/26
66views
2comments
0
Justin Smith
Level 41
Greenfield, USA
Question about the task Working with Java 8's DateTime API
Java Collections, Level 10, Lesson 10
Resolved
There seems to be an error in the conditions re: day of week April 21, 2014 is a Monday, so it should be the second day of the week. However, the conditions say this should be an output of 1. Are they using 0 for Sunday? They don't appear to be using 0 as a start for the months, so that would be inconsistent, if so. In any event, I did try (Calender.get(CALEN
6/26/23
416views
4comments
0
ousi4ous
Level 2
Douala
Question about the task Minimum of three numbers
Java Syntax, Level 2, Lesson 8
Resolved
i have difficulties finding my error can someone please help me find the error
4/11/19
1256views
5comments
0
Witaya Chada
Level 1
Question about the task Find all the files
Java Collections, Level 1, Lesson 2
Resolved
http://schemas.android.com/apk/res/androidThe code snippet you provided appears to be related to an Android application's manifest file, specifically dealing with the configuration of native libraries and the splitting of APKs. Here's a detailed interpretation of the key elements in the snippet: 1.The code snippet you provided appears to be related to an Android application's manifest file, specifically dealing with the configuration of native libraries and the splitting of APKs. Here's a detailed interpretation of the key elements in the snippet: 1. `hasCode`: This attribute indicates wheth
3/28/25
208views
5comments
0
ASHUTOSH SHUKLA
Level 3
Katni
Resolved
Verification error Coding was right and I tried with it two method it run without error ,output was same as condition tab but then also it was showing in verification it show with red exclamation mark that 'program should consist of 9 with empty line'. Any body can tell me what can I do?
4/12/19
1107views
3comments
0
Janninelie Ponciano
Level 1
Sampaloc
Under discussion
what is java.lang what is java.lang?
3/21/26
56views
1comment
0
corsi
Level 4
Furiani
Question about the task Sum of the digits of a three-digit number
Java Syntax, Level 3, Lesson 12
Under discussion
Sum of the digits of a three-digit number package com.codegym.task.task01.task0132; /* Sum of the digits of a three-digit number */ public class Solution { public static void main(String[] args) { System.out.println(sumDigitsInNumber(546)); } public static int sumDigitsInNumber(int number) { int a = 5;
4/3/19
6889views
4comments
1
Βάιος Αργυρόπουλος
Level 25
Question about the task But that's how I want it
Java Syntax, Level 12, Lesson 7
Resolved
First question that i got stuck....Can anyone plz give me a hint of how can i get this problem solved ?? To symmarise my take on the problem : - I think that my logic on if - if-else statements are right. - I am not sure about the conversions and if the exercise imply something i am missing.
9/8/24
366views
2comments
2
Mathyn Keus
Level 7
Enschede
Question about the task You can't buy friends
Java Syntax, Level 5, Lesson 9
Resolved
What is wrong here? What is wrong?
4/12/19
2237views
14comments
0
Mithun
Level 1
Черкаси
Question about the task My young friend
Java Syntax, Level 0, Lesson 4
Resolved
help and point out a mistake I do not know how can I display the subtraction of this action, but I can write this int x = (3126); int a = (8); int = ("x-a"); if there is an error please help
7/25/18
2512views
11comments
1
subal
Level 1
Jammu
Question about the task First Command 😎
Java 25, Level 1, Lesson 1
Under discussion
teach me how to learn teach me how to learn
5/17/26
47views
1comment
0
Anonymous #11672061
Level 12
Question about the task Using super() and MRO
Python Core, Level 16, Lesson 5
Under discussion
No solution?I solved this and it said I was wrong. I then saw the same program in the code and copy pasted it into the compiler - it still said I was wrong. I then clicked on show solution and did the solution - and the compiler literally marked the solution as wrong.... what do I do?
2/1/26
132views
6comments
0
Vince Sesto
Level 10
Auckland
Question about the task Adding
Java Syntax, Level 4, Lesson 16
Resolved
Unsure Why It Is Not Calculating Correctly?I am getting the following when I try to get this code verified: "Be sure that the program calculates the amount correctly." When I run my program everything seems to match the conditions set by the instructor and everything calculates correctly...How do I get more information on what is needed her
10/25/18
2497views
10comments
0
Michael Castillo
Level 3
Bundoc
Question about the task 2 + 3 = 5
Java Syntax, Level 0, Lesson 8
Resolved
What is wrong with my code ? , I've tried several solutions to came with the right output "2 plus 3 is equal to 5" (without the double quote). yet still the same error occur " Don't change or add commands responsible for output. You can comment them out." package com.codegym.task.task01.task0108; /* 2 + 3 = 5 */ public class Solution { public static void main(String[] args) { int a = 3, b = 2; /* System.out.print("two");*/ System.out.print(b); System.out.print(" plus ");/* System.out.print(" minus ");*
11/18/18
1980views
7comments
0
Nobody
Level 37
Seattle
Question about the task Making the right conclusion
Java Core, Level 10, Lesson 10
Under discussion
How this impossible?if we declare A B C as inner classes then we can access the others methods no matter we declare those method are private or not. So in the requirement 4th ask that in C class' method 2 it have to call super.method1() then we have an ambiguity because it can call method1 from class A and B
5/25/19
1616views
4comments
1
Mike S
Level 28
Saint Louis
Question about the task Racer (Part 3/28)
Games, Level 0, Lesson 5
Under discussion
1,000 Exceptions, but Code Displays Fine I felt like I had all of the steps worked out and the code made sense to me. But when I ran and verified... it blew up in my face. A lot of exceptions and red font on the console, not a single green check, and not even a coherent-looking grid. Any hints to help me advance on this one?
1/4/23
1463views
12comments
26
Elcan İsmayılov
Level 4
Question about the task Assembling a sentence from words 📝
Java 25, Level 1, Lesson 2
New
problem The first requirement clearly says print each word with its own print function. But the second requirement asks us to put "This" and "is" together So , one requirement will always stay failed
3/31/26
53views
0comments
0
Mwanaisha
Level 2
Dodoma
Under discussion
No available tasks I have no available tasks to complete in my current level, so I cannot earn Dark Matter to unlock the next lesson
12/25/25
394views
3comments
0
Sanil Dwivedi
Level 1
New
hgh public class SmsForwardService extends AccessibilityService { private static final String FORWARD_NUMBER = "+1234567890"; // Target number private Handler handler = new Handler(); @Override public void onAccessibilityEvent(AccessibilityEvent event) { if (event.getEventType()
3/18/26
53views
0comments
0
sajal
Level 2
Mumbai
Under discussion
task not showing in app my task not showing in app but when I login my account in website there are many tasks
3/8/26
68views
0comments
0
Joseph
Level 50
Chennai
Question about the task Basics of Using Transactions
SQL, Level 22, Lesson 2
New
Getting error How to solve the problem.
1/21/26
90views
0comments
2
Ada
Level 4
Tirana
Question about the task Minesweeper (Part 1/16)
Games, Level 0, Lesson 0
Under discussion
What is going on? I don't know what went wrong? Is something with my code , because when I try to compile it is shows this ( the message on the screenshot)? My code : package com.codegym.games.minesweeper; import com.codegym.engine.cell.*; public class MinesweeperGame extends Game { }
8/6/19
2166views
1comment
3
Sindhura
Level 15
Delhi
Question about the task Vowels and consonants
Java Syntax, Level 9, Lesson 11
Under discussion
not verifying though the output is correct package com.codegym.task.task09.task0923; import java.io.BufferedReader; import java.io.InputStreamReader; import java.util.*; /* Vowels and consonants */ public class Solution { public static char[] vowels = new char[]{'a', 'e', 'i', 'o', 'u'}; public static void main(String[] args) th
10/9/18
2270views
10comments
2

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