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JAVA QUESTIONS

Dynamically create new instance of a variable in Java
Dynamically create new instance of a variable in Java
around this issue Don't you just have to replace public static void save(User user) with public static void save(Object object)Sidenote:
TAG : java
Date : November 17 2020, 04:01 AM , By : DaniilM
How to put a shape in background in JavaFX?
How to put a shape in background in JavaFX?
This might help you If the purpose of the Rectangle is to just set some color as background, then you can set the default background color to Scene itself while initiating it. Scene has some constructors to set the fill. Something like,..
TAG : java
Date : November 17 2020, 04:01 AM , By : RedHorse Pipz
Translating C++ recursive floodfill implementation for 2D array without any loops, into Java?
Translating C++ recursive floodfill implementation for 2D array without any loops, into Java?
wish help you to fix your issue I needed to put the line pic[row][col] = newC in the program. Another problem was that I didn't know variableName++ is a different command from variableName + 1 so the recursion didn't work as expected. variableName++
TAG : java
Date : November 17 2020, 04:01 AM , By : Payman
How can I erase the '\' character from my string
How can I erase the '\' character from my string
Hope this helps Solution: The problem was that new Gson().toJson(smsToSend) returns a String, so jsonArray was an array of string. I changed to new Gson().toJsonTree(smsToSend) which returns an Object and now it works fine.
TAG : java
Date : November 17 2020, 04:01 AM , By : ramz
What is the correct time complexity?
What is the correct time complexity?
I wish this helpful for you The runtime complexity of this is O(nm), where n is the number of rows and m is the number of columns in your matrix.The reason for this:
TAG : java
Date : November 16 2020, 04:01 AM , By : user2183729
Spring RMQ listener always use PLAIN auth even after configuring SSL properties
Spring RMQ listener always use PLAIN auth even after configuring SSL properties
I wish did fix the issue. OK, so here is what i found. There is an open defect on spring-boot which mentions that due to unavailability of configuring sasl while using spring boot, it always uses PLAIN mode of authentication and there is a workaround
TAG : java
Date : November 16 2020, 04:01 AM , By : user2183697
multiple classes in Dr. Java
multiple classes in Dr. Java
help you fix your problem In one file you can have only one public class, and multiple non-public classes Your filename has to match with the only public class To make your class runnable it should contain a public static void main(String args[]) met
TAG : java
Date : November 16 2020, 04:01 AM , By : user2183695
How to compare ArrayList elements fluently?
How to compare ArrayList elements fluently?
Does that help For "a lot of data", it will be slow whether you have one for loop calling indexOf or two for loops. Each of these for loops contributes O(n), even indexOf which is a loop in disguise. These are O(n2) algorithms.Assuming that all eleme
TAG : java
Date : November 16 2020, 04:01 AM , By : Mike
No pending reply: ConsumerRecord
No pending reply: ConsumerRecord
hope this fix your issue If it's intermittent, it's most likely the reply took too long to arrive. The message seems quite clear
TAG : java
Date : November 16 2020, 04:01 AM , By : kimtt lamfg
Resize Bitmap to 512x512 Without changing original aspect ratio
Resize Bitmap to 512x512 Without changing original aspect ratio
I wish did fix the issue. Ok, so you're really close. I can't test this right now, but basically what needs to be changed is1) You need to apply the same scale to both X and Y, so you need to pick the smaller one (try the bigger one if that doesn't w
TAG : java
Date : November 16 2020, 04:01 AM , By : Sneha Vankamamidi
Java - Saving byte[] into an image file
Java - Saving byte[] into an image file
fixed the issue. Will look into that further it appears that your imageInByteArr is too short. I was able to get the same error you get from this
TAG : java
Date : November 16 2020, 04:01 AM , By : slobodan Sarenac
Marker view not showing with MPChartAndroid library
Marker view not showing with MPChartAndroid library
should help you out I had the same issue. I solved passing the activity to my MyMarkerView instance, passing the super.contentRefresh() in my MyMarkerView and then I made a few changes in the xml.So: pieChart.setMarker(new MyMarkerView(MyActivity.thi
TAG : java
Date : November 16 2020, 04:01 AM , By : urlGrey
Check database data
Check database data
it should still fix some issue I have a database "library_db" hosted on azure, which has a table "admin_db", with the fields "username" and "password". How can I check in java if a certain user is existent in my table? (If a user has been registered
TAG : java
Date : November 16 2020, 04:01 AM , By : user2183498
MyBatis in Spring with Sql Builder and annotation
MyBatis in Spring with Sql Builder and annotation
around this issue The problem happens because mybatis cannot pass parameters from mapper method to the builder. You either need to annotate the parameters in the builder:
TAG : java
Date : November 16 2020, 04:01 AM , By : user2183470
Eclipse error 'could not determine Java version' when importing project
Eclipse error 'could not determine Java version' when importing project
With these it helps I do not know the cause of the issue, but the solution was to regenerate the eclipse project files.
TAG : java
Date : November 16 2020, 04:01 AM , By : vance
Comparison of two identical strings using String.equals() always returns as false
Comparison of two identical strings using String.equals() always returns as false
like below fixes the issue Before if write this: String str = splitData[splitData.length - 1].toUpperCase(); and after that log the length of str and checksum
TAG : java
Date : November 16 2020, 04:01 AM , By : palo
How to get raw JSON text from Unirest response in Java
How to get raw JSON text from Unirest response in Java
I wish did fix the issue. The Unirest API supports this out of the box - Use asString() instead of asJson() to get the response as HttpResponse.
TAG : java
Date : November 15 2020, 04:01 AM , By : RMD
How to create a JavaFX TableView without warnings?
How to create a JavaFX TableView without warnings?
this will help TableView requires data objects that it will try to represent in each row. So as per your example, you are trying to display a list of Persons in your table. So your tableView reference type will be of type Person. like
TAG : java
Date : November 15 2020, 04:01 AM , By : Ramon Almeida
MessageBodyWriter not found error for Jersy / Jetty server
MessageBodyWriter not found error for Jersy / Jetty server
will help you As mentioned in my answer in MessageBodyProviderNotFoundException while running jar from command line, there is a "services file", namely org.glassfish.jersey.internal.spi.AutoDiscoverable, which is included in many jars. The purpose of
TAG : java
Date : November 15 2020, 04:01 AM , By : user2183338
Reading a messy CSV file
Reading a messy CSV file
this will help If after a comma there is a space after the performer, it works fine. But if there isnt one it just prints the groupName.
TAG : java
Date : November 15 2020, 04:01 AM , By : Ted Goggleye
How to use shared preference to send data from activity to fragment?
How to use shared preference to send data from activity to fragment?
will help you If you insist on shared preference use this code : To save the data
TAG : java
Date : November 15 2020, 04:01 AM , By : user2183275
how can I read a text file, process it & write toString()
how can I read a text file, process it & write toString()
like below fixes the issue I'm not gonna give you the complete solution but here is a way to approach this problem. You need readLine() instead of nextLine() Once you read the values, you need to call the add() function with the Student Object to add
TAG : java
Date : November 15 2020, 04:01 AM , By : Junaid Naseer
Sonar - When instantiating a SimpleDateFormat object, specify a Locale
Sonar - When instantiating a SimpleDateFormat object, specify a Locale
hope this fix your issue Below is my method to set the date in yyyy-MM-dd format code is working as expected but I am getting sonar error - When instantiating a SimpleDateFormat object, specify a Locale. Any Suggestion experts how to resolve this iss
TAG : java
Date : November 15 2020, 04:01 AM , By : Leszer Colocado
Persist collection using 2 tables and Entities, Java/Spring
Persist collection using 2 tables and Entities, Java/Spring
wish helps you The good solution in your case is to use unidirectional relation One to Many, where you have list of GroceryItem in the Transaction class. You can do it in this way as below:
TAG : java
Date : November 15 2020, 04:01 AM , By : user2183193
Java coding efficiency. JRadioButton objects and ItemListener interaction
Java coding efficiency. JRadioButton objects and ItemListener interaction
I hope this helps . ActionEvent.getSource() will return the JRadioButton that generated in, so you could
TAG : java
Date : November 15 2020, 04:01 AM , By : user2183191
Swap method of Linked List Nodes at Position a and b, stuck on infinite loop in Java
Swap method of Linked List Nodes at Position a and b, stuck on infinite loop in Java
With these it helps You are not linking things correctly. You make both ptr2 and prev2 link to ptr1.link.Assume this is the list
TAG : java
Date : November 15 2020, 04:01 AM , By : user2183180
Towers of Hanoi alphabetical rings
Towers of Hanoi alphabetical rings
I hope this helps . The problem is in the first If-statement in the towersOfHanoi(...). You put the static string as:
TAG : java
Date : November 15 2020, 04:01 AM , By : Ujjwal Prazapati
Regex expression for file name with 2 underscores and 3 segments
Regex expression for file name with 2 underscores and 3 segments
hope this fix your issue I believe /^[^_]+_[^_]+_[^_]+\.properties$/ should meet your requirements:
TAG : java
Date : November 15 2020, 04:01 AM , By : user2183121
Is this linked list implemented circularly?
Is this linked list implemented circularly?
Any of those help I received a zero on the assignment -- according to the grader my implementation of the linked list is not circular.
TAG : java
Date : November 15 2020, 04:01 AM , By : Jeremy
search into loaded file
search into loaded file
it fixes the issue If I understand correctly, you want to negate the value of all occurrences of Y. For example: Y = -2356.597 should become Y = 2356.597 Y = 3095.068 should become Y = -3095.068
TAG : java
Date : November 15 2020, 04:01 AM , By : user2183065
Dynamically create columns / table using SpringBoot when i make Rest api calls
Dynamically create columns / table using SpringBoot when i make Rest api calls
Does that help You have a connection to the database. It accepts arbitrary statements.So long as the user you're connecting with has the necessary privileges, nothing prevents you from using the connection to send DDL statements (like CREATE TABLE an
TAG : java
Date : November 14 2020, 04:01 AM , By : Jess
Java screen how to make the input line always be below
Java screen how to make the input line always be below
fixed the issue. Will look into that further In that case you have to take record of current screen in any String type variable and then have to clear screen every time user inputs, then show the recorded screen and then the input line...I think you
TAG : java
Date : November 14 2020, 04:01 AM , By : MHS
Are signal event and message event interchangeable in BPMN?
Are signal event and message event interchangeable in BPMN?
should help you out No they don't do the same thing. The official documentation says:
TAG : java
Date : November 14 2020, 04:01 AM , By : user2182964
How to format a Period in Java 8 / jsr310?
How to format a Period in Java 8 / jsr310?
will be helpful for those in need One solution is to simply use String.format:
TAG : java
Date : November 14 2020, 04:01 AM , By : Mikael R. Trimpe
Why is x == (x = y) not the same as (x = y) == x?
Why is x == (x = y) not the same as (x = y) == x?
help you fix your problem which, by the order implied by brackets, should be calculated first
TAG : java
Date : November 14 2020, 04:01 AM , By : user2182956
Testing a method that is called from another method
Testing a method that is called from another method
I think the issue was by ths following , You could try subclassing, although it relies on the PROD class to be friendly (allow overriding of its methods).
TAG : java
Date : November 14 2020, 04:01 AM , By : Karimz
How do I get only scan just one class with Reflections
How do I get only scan just one class with Reflections
Hope that helps I have two classes Foo and FooBar both of which has some annotated fields. I would like to scan just Foo and not FooBar for the annotated fields. I am currently trying to use org.reflections.Reflections from https://github.com/ronmamo
TAG : java
Date : November 14 2020, 04:01 AM , By : user2182944
How to access an array from the main method?
How to access an array from the main method?
may help you . 1) The array is defined in the method scope of arraylistExample(). It is not visible from main().2) The array will be empty if you never call the method.
TAG : java
Date : November 14 2020, 04:01 AM , By : Mirko Paturzo
API for scrolling one Gb rtf document in swing app
API for scrolling one Gb rtf document in swing app
wish of those help For a one gigabyte document you're going to render only part of it at a time. A general approach would be to stream read part of the document and render that part, then stream in more as the user scrolls down. You could try to read
TAG : java
Date : November 14 2020, 04:01 AM , By : Stefan L
Spring validator custom HTTP status
Spring validator custom HTTP status
Does that help The validation process would throw an org.springframework.web.bind.MethodArgumentNotValidException, therefore you can add an exception handler to your controller:
TAG : java
Date : November 14 2020, 04:01 AM , By : Deepika
Selecting from drop down list Selenium Java
Selecting from drop down list Selenium Java
will help you in Java, you need to create a select element to choose the options of the select.The code will be somenthing like:
TAG : java
Date : November 14 2020, 04:01 AM , By : user2182879
java, creating a loop while keyboardscanner dont receive an input
java, creating a loop while keyboardscanner dont receive an input
may help you . this will execute a task in other thread and accept inputs till the input is empty. Also, be aware of closing Scanner
TAG : java
Date : November 14 2020, 04:01 AM , By : snoopcat
OneSignal: How to target notification receiver users by tag values?
OneSignal: How to target notification receiver users by tag values?
hop of those help? An alternative to treat questions as topics in order to notify updates to the users following the questions would be to manage the relation between the questions an the users are following them in the application itself.When a ques
TAG : java
Date : November 14 2020, 04:01 AM , By : user2182769
Is it possible to have multiple types with the same variable name?
Is it possible to have multiple types with the same variable name?
With these it helps No, this is not possible due to confusion when setting the type. But a way to do this would be to use inheritance and extending myRobot, EV3, xxxEV3, etc. from a base Robot interface.
TAG : java
Date : November 14 2020, 04:01 AM , By : user2182756
JavaFX Switch TextFields After Pressing Enter
JavaFX Switch TextFields After Pressing Enter
I wish this help you For example you textFields named textField and textField2, then next code will do the thing
TAG : java
Date : November 14 2020, 04:01 AM , By : Zakaria ASRI
AWS S3 Java SDK - ListVersionsRequest Get Only Latest Versions
AWS S3 Java SDK - ListVersionsRequest Get Only Latest Versions
I wish this helpful for you Is there any way to specify to only include the latest version of each object in the ListVersionsRequest? I need the version value, so a simple AmazonS3Client.listObjects(...) will not suffice because S3ObjectSummary has n
TAG : java
Date : November 14 2020, 04:01 AM , By : Hyyudu
Convert a range of integer numbers to string and store the shortest common match in DB
Convert a range of integer numbers to string and store the shortest common match in DB
help you fix your problem I have a range of integers representing phone number ranges like: , Perhaps something like this:
TAG : java
Date : November 14 2020, 04:01 AM , By : Jomsy John
Android studio unable to paste files to assets folder
Android studio unable to paste files to assets folder
hop of those help? Nevigate to the assets folder in file explorer. It will be at you_app_folder/app/src/main/assets/fontsPaste the files there.
TAG : java
Date : November 13 2020, 04:01 AM , By : Rafael Ribeiro
Spring session lazy deserialization
Spring session lazy deserialization
around this issue I believe I got what's happening: Spring-Session-Hazelcast by default store session updates locally until request completed when request completed, before returning the response, send everything to the cluster using EntryProcessor.
TAG : java
Date : November 13 2020, 04:01 AM , By : Amos Holland
LinkedHashMap from CSV not getting all entries
LinkedHashMap from CSV not getting all entries
this will help It seems I know what is wrong)Try to move line linkedHashMap.put(key, values); out of internal for loop, like this:
TAG : java
Date : November 13 2020, 04:01 AM , By : user2182617
Execute PL/SQL block in Oracle 11g and Process the cursor in Java client
Execute PL/SQL block in Oracle 11g and Process the cursor in Java client
To fix this issue Using a ref cursor is problematic because you've exhausted the existing PL/SQL cursor (which isn't the same type as a ref cursor anyway, hence the error), and you can't requery as you've already updated and commited the changes. Rea
TAG : java
Date : November 13 2020, 04:01 AM , By : user2182614
ADF checkboxes in table, selected row missing timing
ADF checkboxes in table, selected row missing timing
To fix this issue The best way to add a selectBooleanCheckbox to a table based on a ViewObject is to add a boolean transient value to your viewObject. Doing so will allow you to have a different boolean value saved for each row and to easily access i
TAG : java
Date : November 13 2020, 04:01 AM , By : Valentin Trendence
How to get multiple images from your PC in your android studio's project resource file?
How to get multiple images from your PC in your android studio's project resource file?
fixed the issue. Will look into that further After a lot of surfing, I found out this, and now everything works cool!
TAG : java
Date : November 13 2020, 04:01 AM , By : user2182569
How can I check if particular value exists using Java driver 3.6+ mongodb?
How can I check if particular value exists using Java driver 3.6+ mongodb?
Hope that helps To check if particular value exists, you can use method count() with $eq operator:
TAG : java
Date : November 13 2020, 04:01 AM , By : yogesh
Java Arrays Manipulation
Java Arrays Manipulation
hop of those help? Hard to say what you are doing wrong without looking at your code. But here is the general way of doing it. Lets say you have two classes like this:
TAG : java
Date : November 13 2020, 04:01 AM , By : Raef
java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.ActivityThread$ApplicationThread
java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.ActivityThread$ApplicationThread
I hope this helps you . You will need to pass the calling activity as a context parameter to your new MyCalendar(context) call. Then from your calendar class, invoke context.startActivity(intent)
TAG : java
Date : November 13 2020, 04:01 AM , By : user2182524
JSON deserializer with generic type using TypeReference
JSON deserializer with generic type using TypeReference
I wish this help you What you encountered here is a common problem caused by something called type erasure, the way java implements generics.
TAG : java
Date : November 13 2020, 04:01 AM , By : user2182487
How to access a method from the main method in java?
How to access a method from the main method in java?
This might help you I have this code: , But it work !!!!
TAG : java
Date : November 13 2020, 04:01 AM , By : Rahman Mehboob
Sorting an array of object, then setText with if else
Sorting an array of object, then setText with if else
To fix this issue It is not clear what is supposed to be output if the checks fail, so I'm guessing 0.0, but it could be adjusted. The approach, if I followed the OP's logic, can be condensed to a loop, reducing the amount of checking. The specific o
TAG : java
Date : November 13 2020, 04:01 AM , By : user2182472
Keeping a variable when referring to a method multiple times
Keeping a variable when referring to a method multiple times
may help you . I think you mean that you want to preserve the values of num and num2. Remove their declarations from random(), and put these at the class level, before main():
TAG : java
Date : November 13 2020, 04:01 AM , By : kong

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