Page 110 | CodeGym online Java course - Help

anupam jha
Level 7
Under discussion
declaration m a bit confused.sometimes i declare variables inside main method sometimes not.same with method...where to declare variables n methods.any rule??
12/29/20
532views
1comment
0
Vitalina
Level 20
Question about the task Factory method pattern
Java Core, Level 6, Lesson 13
Resolved
Please gelp me! Last condition..What's wrong? I don't understand
12/29/20
493views
2comments
0
Liliane Top
Level 24
Amsterdam
Question about the task Transactionality
Java Core, Level 7, Lesson 10
Resolved
Why do I fail the test?Is si because I use Scanner and I should use a bufferedReader? if so why? And what is the difference between: allLines.removeAll(linesForRemoval); && linesForRemoval.clear(); ??
12/29/20
723views
5comments
0
Liliane Top
Level 24
Amsterdam
Question about the task Superfluous synchronization
Java Core, Level 7, Lesson 10
Under discussion
Why is he readObject() not synchronized?I thought that you have to synchronize all methods that involve fields that can be accessed by several threads at the same time. the writeObject is synchronized but the readObject is not this could cause problems as you could read the wrong value... where do I go wrong in my thinking?
12/29/20
809views
4comments
0
LennyMan
Level 25
Lucca
Question about the task File in a static block
Java Core, Level 5, Lesson 12
Resolved
My version should be correct Its working but not validate, i seen the solution and its quite different from mine,but the output should be the same. im just wondering if my version it's legal and correct even if its not validate. Please let me know if there are some important mistake.
12/29/20
508views
2comments
0
Justin Johnson
Level 31
Clearwater
Question about the task Restaurant (part 22)
Java Multithreading, Level 9, Lesson 15
Under discussion
timing out....please help cant get it to validate
12/18/20
745views
2comments
0
Vo
Level 41
Sofia
Question about the task Adding a file to an archive
Java Collections, Level 1, Lesson 6
Resolved
Why is my zip file getting corrupted?Even if I exclude the part in which I add files to the new created zip, it gets corrupted. Upon opening the archive I get "Error occurred" message. package com.codegym.task.task31.task3105; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOExc
12/29/20
865views
1comment
0
Marvin Ellis
Level 7
Peoria
Question about the task Playing Javarella
Java Syntax, Level 7, Lesson 9
Resolved
Array Issue I think I have the premise down correctly. I am sorting the 3 list inside of 1 for loop but I am getting array index and range errors. Why is that?
12/28/20
530views
2comments
0
Josephine
Level 1
Normal
Question about the task Replacing numbers
Java Core, Level 9, Lesson 11
Archived
My code works perfectly in InteliJ.why it is not passing.Someone help My code works perfectly in InteliJ.Someone please help
12/24/20
529views
3comments
0
Liliane Top
Level 24
Amsterdam
Question about the task CRUD 2
Java Core, Level 7, Lesson 10
Resolved
The allPeople list is volatile what does the synchronized(allPeople) add to this?in the code we have: public static volatile List allPeople = new ArrayList<>(); and we have to add synchronized(allPeople) to the each case: case "-c": synchronized (allPeople) { for (int i = 1; i < args.length; i = i + 3) { creat
12/28/20
437views
2comments
0
Rich
Level 23
San Diego
Question about the task OOP: Fix inheritance problems
Java Core, Level 5, Lesson 2
Under discussion
last requirement All fingers come up as artificial for some reason. little hint pls...
12/27/20
442views
1comment
0
Anitamalina
Level 18
København
Question about the task Going national
Java Syntax, Level 8, Lesson 11
Under discussion
My code works, but I can't pass I don't understand why this isn't working?
12/27/20
576views
1comment
0
Liliane Top
Level 24
Amsterdam
Question about the task The early bird gets the worm
Java Core, Level 6, Lesson 13
Resolved
What is wrong with my code?Why is it not stop running? I do not understand . I s read a line from the console and add it to the list. I increment the readStringCount It should stop running as readStringcount is no longer smaller than count However it just keeps running why?
12/26/20
1305views
27comments
0
Anitamalina
Level 18
København
Question about the task Make a family
Java Syntax, Level 8, Lesson 11
Under discussion
NullPointerException in line 67 Hi, I don't understand why I get a null pointer exception in line 67, and what's wrong with my code? Can someone help me, thank you :-)
12/28/20
825views
1comment
0
slyyx
Level 15
New York City
Question about the task Snake (Part 18/20)
Games, Level 0, Lesson 1
Under discussion
I can't tell if I'm misunderstanding the directions I can't tell if I'm misunderstanding the directions or am just going about the problem the right way
12/12/20
741views
4comments
2
Liliane Top
Level 24
Amsterdam
Question about the task CRUD
Java Core, Level 7, Lesson 10
Resolved
This is a real puzzle I do not know why I fail the test. The output is correct just not very clean code but it does work. So how to go from here?
12/27/20
648views
9comments
0
Marvin Ellis
Level 7
Peoria
Question about the task String array in reverse order
Java Syntax, Level 7, Lesson 4
Resolved
Array Out of Bound Index What is causing this excpetion
10/22/20
834views
2comments
0
Marvin Ellis
Level 7
Peoria
Question about the task To the top of the list
Java Syntax, Level 7, Lesson 6
Resolved
The program should add lines to the beginning of the list.Should I change the for loop to start from10 and go to 0? I am not sure why it stating the last two are wrong?
10/22/20
914views
1comment
0
Rich
Level 23
San Diego
Question about the task The simplest code: part 2
Java Core, Level 5, Lesson 6
Under discussion
little hint it refuses to pass with an empty constructor. just need a hint
12/27/20
570views
1comment
0
Tina
Level 17
Saint Petersburg
Question about the task The simplest code: part 2
Java Core, Level 5, Lesson 6
Under discussion
Why it does not pass the test. Why it does not pass the test.
6/10/19
1937views
7comments
0
Abhishek Rangari
Level 22
Nagpur
Question about the task OOP: Method overloading
Java Core, Level 5, Lesson 4
Under discussion
Can anyone help me in this quest?Not sure what is going wrong ..
12/3/18
1986views
2comments
0
The Chief
Level 18
Question about the task Census
Java Syntax, Level 8, Lesson 8
Under discussion
Why doesn't this task need a HashMap copy?Why don't the middle two methods require a copy of the HashMap such as: HashMap copy = new HashMap(map); like similar tasks on this lesson do?
12/24/20
506views
5comments
0
anupam jha
Level 7
Under discussion
static why do we need static class ?? whats the reason...
12/26/20
537views
1comment
0
Laura
Level 7
Lübeck
Question about the task Cat and statics
Java Syntax, Level 6, Lesson 11
Under discussion
Code mistake Although I compared my code to others, I have a problem with the static variable says the compiler Idk I can't find my mistake. Can anyone help me? Thank u.
10/4/20
658views
2comments
1
George
Level 15
Question about the task Minesweeper (Part 6/16)
Games, Level 0, Lesson 0
Resolved
Counting mines for a cell that is a mine?This is failing requirement 3 saying that I'm counting mines for a cell that is mine. I believe I skip those with continue command. Any ideas? It's also failing the 4th requirement. Says that countMineNeighbors() isn't using getNeighbors(GameObject) which I am using but obviously I'm missing someth
9/17/20
925views
2comments
2
hidden #10444738
Level 16
Question about the task Exception when working with numbers
Java Syntax, Level 9, Lesson 6
Under discussion
printStackTrace?Wouldn't printStackTrace be better, it shows also the line number and the error. Just by using catch Execption errror
7/28/19
1936views
2comments
0
Jen P
Level 26
Question about the task Reading from a stream
Java Collections, Level 2, Lesson 4
Under discussion
"Under no circumstances should null be returned" error forever, even passed local unit test.Hi Guys, I , again sadly, met the same "Under no circumstances should null be returned." error in this problem. I have no idea on why this error constantly throws out. Any advice ?! Thank you! public class Solution { public static void main(String[] args) throws IOException { StringWri
8/24/19
1385views
7comments
0
Liliane Top
Level 24
Amsterdam
Question about the task Shall we play?
Java Core, Level 6, Lesson 13
Resolved
Why do I fail the test?The output seems correct but I fail the test with 2 errors 1) The run method does not display the required text. 2) If a player wins, his or her run method should display [getName() + ":won!"]. For example: [Jones:won!]. but my output is: Gates:Start Game Smith:Start Game Gates:Gather resources Gat
12/24/20
760views
4comments
0
null
Level 26
Orlando
Question about the task In the blue depths of the stack trace…
Java Syntax, Level 9, Lesson 2
Under discussion
Can anyone explain why i use: stackTraceElement elements.length will return its length but not elements.length() as a method ..
2/20/20
1035views
3comments
0
Lorraine Brown
Level 2
Oakland
Question about the task No comments needed
Java Syntax, Level 0, Lesson 8
Under discussion
I do not not understand the answer in hint.I downloaded intellij IDEA. I ran it and see the answer. Can you explain it in email to me mrsbrown08837@gmail.com? I went to https://www.w3schools.com/java/java_operators.asp to verify how the operators should work.
9/30/20
795views
1comment
0

1
...
108
109
110
111
112
...
374