Page 78 | CodeGym online Java course - Help

Fabian Andiel
Level 9
Vienna
Question about the task Four mistakes
Java Core, Level 3, Lesson 2
Under discussion
Dream interface?Hi guys, I got the sulotion with the help of the forum, but I am not completely sure about the following points: "hy has the dream Interface access to the Hobby class? Why can we access the Dream Interface directly? I thought interfaces are all abut methods, why we instantiate a variable in the i
7/20/20
737views
1comment
0
Rafał
Level 35
Łódź
Question about the task Deserializing an XML object
Java Collections, Level 3, Lesson 8
Under discussion
what am i doing wrong?what am i doing wrong?
10/8/20
624views
1comment
0
Szymon
Level 41
Warsaw
Question about the task Another kind of deadlock
Java Multithreading, Level 7, Lesson 4
Resolved
Woudn't just synchronized (lock) {} be enough?Why do we need to lock (this) as well? I see it that way: The thread goes into the first method -> locks the 'lock' mutex -> then goes to the second method and tries to go into the synchronize (lock) {} block but it can't because the 'lock' mutex was already acquired in the first method ->
4/27/21
771views
5comments
0
Maria
Level 22
Moscow
Question about the task Symbol frequency
Java Core, Level 8, Lesson 11
Resolved
trying to pass penultimate requirements..What is wrong? Treemap is already sorted...
4/29/21
513views
2comments
0
The Chief
Level 18
Question about the task Task about algorithms
Java Syntax, Level 9, Lesson 11
Under discussion
Need help understanding this code.I couldn't figure out this task so I had to download the solution but I need help understanding it. First, how can the user enter both strings and numbers when the arraylist and array in the main method are only string types? Is it because the compiler takes the numbers and sets them as being of st
4/28/21
848views
5comments
0
John
Level 17
Mansfield
Question about the task Let's make the code do something useful!
Java Syntax, Level 9, Lesson 11
Under discussion
Help there is no copy happening i can't figure out what's wrong or lacking
4/27/21
804views
8comments
0
Jurij Thmsn
Level 29
Flensburg
Question about the task Serializing people
Java Core, Level 10, Lesson 10
Resolved
quick question I get it why the Logger and PrintStream fields must be transient. Can anyone explain me briefly why the fullName and greeting fields have to be transient, too? (regarding "final" modifier the Professors' article said: "Second, you should also pay attention to variables with the final modifier. Whe
4/28/21
708views
2comments
0
Andrei
Level 41
Question about the task Finagle's first law: if an experiment succeeds, then something went wrong...
Java Multithreading, Level 5, Lesson 11
Resolved
What's the point of this exercise? I moved the Thread.yield(); around the code and the output was the same. I don't get it. public class Solution { public static class YieldRunnable implements Runnable { private int index; public YieldRunnable(int index) { this.index = index; } public void run() { System.out.println("begin-" + index); Thread.yield
4/28/21
930views
2comments
0
Csaba Fülöp
Level 6
Debrecen
Question about the task Task about algorithms
Java Syntax, Level 5, Lesson 12
Under discussion
Display max is not fullfilled even if it is :/Every condition have passed except displaying max, however on the console it gets displayed yet the condition is not met. Can anyone help me to understand why it is not accepted?
4/25/21
701views
3comments
0
Cristian
Level 16
Bucharest
Question about the task Minimum and Maximum
Java Core, Level 1, Lesson 11
Under discussion
My output is The minimum is 0 The maximum is 0. Why? What should I change in my code? Thanks a lot! package com.codegym.task.task11.task1123; public class Solution { public static void main(String[] args) throws Exception { int[] data = new int[]{1, 2, 3, 5, -2, -8, 0, 77, 5, 5}; Pair result = getMinimumAndMaximum(data); System.out.println("The minimum is " + result
4/28/21
531views
2comments
0
Andrei
Level 41
Question about the task It's not as easy as it seems
Java Multithreading, Level 5, Lesson 7
Under discussion
Help please? What should I do here?Can anyone please provide some pointers?
4/27/21
584views
5comments
0
Gellert Varga
Level 23
Szekesfehervar
Resolved
Is this possible?? Isn't it just another misspelling again?https://codegym.cc/quests/lectures/questcore.level07.lecture01 The "another example" in the lesson, with the swaping of the names. As Dmitri said in his post at 29 December 2020, 06:07: "if each thread is working with it's own MyClass instance why all this mess should happen?" In my opinion, this pr
4/26/21
863views
10comments
0
Maxim Raitin
Level 20
Tomsk
Question about the task Writing to a file from the console
Java Core, Level 3, Lesson 11
Resolved
Please Help me Hello there! What is wrong?
4/26/21
726views
3comments
0
Sophia
Level 1
Question about the task Kind words for the teacher
Java Syntax, Level 0, Lesson 4
Under discussion
Can't find what's wrong I can't see what's wrong with this. Everytime I try to run it, it says it can'r find the symbol and highlights the first period in the code. public static void main(String[] args) { System.out.printIn("Ellie is clever"); System.out.printIn("Ell
12/28/20
726views
5comments
0
Steven's Education
Level 7
Jahil
Question about the task Task about algorithms
Java Syntax, Level 5, Lesson 12
Under discussion
The code works but not with the task I created the algorithm to find the maximum number from x input.It works but it doesn't fill the requirements. Somebody help please
4/23/21
794views
3comments
0
Emeka
Level 4
Question about the task Minimum of four numbers
Java Syntax, Level 2, Lesson 8
Under discussion
confusion about the ? operator I have an idea for how the ? operator works: it is shorthand for if else statements. though I'm confused as to how it can be put as a return value of a method. At first, I thought the operator was syntactically equivalent (i.e. in any context, you can interchange the two and the program will yield t
4/24/21
1106views
3comments
0
Sansho
Level 19
Bordeaux
Question about the task Task about algorithms
Java Syntax, Level 9, Lesson 11
Under discussion
The outputs are okay, but the robot is tellin' me NooOOoo Well, I think my algo is correct but it doesn't validate 2 things (well I admit, I don't used correctly the "greaterThan" because I found something more efficient)...
4/23/21
723views
4comments
0
Cristian
Level 16
Bucharest
Question about the task Functionality is not enough!
Java Syntax, Level 10, Lesson 11
Under discussion
Something is wrong here! Thank you so much! package com.codegym.task.task10.task1019; import java.io.*; import java.util.HashMap; /* Functionality is not enough! */ public class Solution { public static void main(String[] args) throws IOException { HashMap map = new HashMap<>(); BufferedReader reader = new Buffe
4/23/21
735views
2comments
0
Anthony Chalk
Level 30
London
Question about the task Writing our own ThreadFactory
Java Multithreading, Level 8, Lesson 4
Under discussion
Got it right but don't understand small point I initially failed: The AmigoThreadFactory factory must create threads that are not daemons. The AmigoThreadFactory factory must create threads with a normal priority level. Until I added: thread.setDaemon(false); thread.setPriority(5); But aren't these the default values for any new Thread?
4/22/21
1306views
7comments
0
Xavier
Level 17
Pearland
Question about the task Functionality is not enough!
Java Syntax, Level 10, Lesson 11
Under discussion
I get an error when nothing is entered for id.I've spent hours on this and I don't know what more to do. The code works just fine if nothing is entered for name, but I get a NumberFormatException error when nothing is entered for id.
4/23/21
781views
2comments
0
Jurij Thmsn
Level 29
Flensburg
Question about the task Reading and writing to a file: CodeGym
Java Core, Level 10, Lesson 2
Resolved
false When checking with my test file everything seems fine to me. Still getting a "false" output, not to mention the validation. I've been staring at this for too long. Maybe someone has a hint for me? Thanks in advance! public class Solution { public static void main(String[] args) { /
4/22/21
710views
3comments
0
Maria
Level 22
Moscow
Question about the task Clew
Java Core, Level 6, Lesson 13
Resolved
Last requirements..Why?? whats wrong?? @#$@#@#
4/16/21
937views
6comments
0
Cristian
Level 16
Bucharest
Question about the task Array of string lists
Java Syntax, Level 10, Lesson 11
Under discussion
Something is wrong here! Thanks a lot! package com.codegym.task.task10.task1015; import java.util.ArrayList; /* Array of string lists */ public class Solution { public static void main(String[] args) { ArrayList[] arrayOfStringList = createList(); printList(arrayOfStringList); } public static ArrayList[
4/22/21
729views
5comments
0
Zach
Level 22
Fort Collins
Question about the task Who called me?
Java Syntax, Level 9, Lesson 2
Under discussion
How do you get the correct element in the stackTrace? package com.codegym.task.task09.task0903; /* Who called me? */ public class Solution { public static void main(String[] args) throws Exception { method1(); // StackTraceElement[] elements = Thread.currentThread().getStackTrace(); // for (StackTraceElement el
4/15/21
668views
2comments
0
John
Level 17
Mansfield
Question about the task Method in a try-catch
Java Syntax, Level 9, Lesson 11
Under discussion
how do i know what exception to catch?in this case how can i able to know what specific exception to catch instead of using Exception as general?
4/22/21
853views
4comments
0
Edward Rickers
Level 15
Washington
Question about the task Streets and houses
Java Syntax, Level 7, Lesson 4
Archived
Says I didn't create an array of 15 integers package com.codegym.task.task07.task0706; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; /* Streets and houses */ public class Solution { public static void main(String[] args) throws Exception { Integer[] houses = new Integer[15];
4/22/21
710views
2comments
0
ImDevin
Level 15
Old Town
Resolved
Intellij not running the current task - Help would be appreciated I've not been able to run the current task for a while. Every time I run a current task (right now, I'm on 0712), it runs 0523. The Edit Configuration shows the current, correct task, but it only runs the task 0523. Don't know what I can do to fix this. Any help would be appreciated. thx
4/20/21
647views
2comments
0
John
Level 17
Mansfield
Question about the task What's today's date?
Java Syntax, Level 9, Lesson 11
Resolved
Month is in LowerCase I got the exact right output except that the month is in lower case, can someone give a hint on how to fix it?
4/22/21
871views
3comments
0
John
Level 17
Mansfield
Question about the task Catching custom exceptions
Java Syntax, Level 9, Lesson 8
Under discussion
Help Can somebody give a little hint?
4/19/21
644views
2comments
0
oli blaustrom
Level 18
Luzern
Question about the task Let's talk music
Java Core, Level 6, Lesson 3
Under discussion
My thread doesn't wake up After calling the sleep method nothing else will be called in run. I don't get it? I tried some solutions of others here too that supposed to work but they have the same problem when I put it in after sleepNseconds nothing gets called.
2/28/20
1121views
6comments
0

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