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JAVA QUESTIONS

How do i exit a loop when user enters null
How do i exit a loop when user enters null
should help you out The problem is you are comparing Scanner object with empty String which is wrong sc.equals(""). First read the input into String and them check empty or not
TAG : java
Date : January 02 2021, 06:48 AM , By : August
There's an error when i try to return a String
There's an error when i try to return a String
around this issue I'm setting up a method to convert int month input by user into String, but can't seem to return the String. , This would do the trick:
TAG : java
Date : January 02 2021, 06:48 AM , By : joshski
Java Nullpointer exception while reading properties file
Java Nullpointer exception while reading properties file
I wish did fix the issue. In TestBase.java, you have a static variable named prop that isn't initialized.Then, down inside your try block in your constructor, you do this:
TAG : java
Date : January 02 2021, 06:48 AM , By : Jesenko Mehmedbasic
How to know if a String has number(s) in it using the Contains() functions?
How to know if a String has number(s) in it using the Contains() functions?
may help you . String.contains() does not accept a regex. You can use String.matches() and change your regex a bit:
TAG : java
Date : January 02 2021, 06:48 AM , By : orneka
How to define priority in JUnit5
How to define priority in JUnit5
I wish this helpful for you First, having unit tests depend on other unit tests is typically bad design. The JUnit 5 User Guide mentions this:
TAG : java
Date : January 02 2021, 06:48 AM , By : TBG
How to display data in specific conditions using recyclerview in Andriod?
How to display data in specific conditions using recyclerview in Andriod?
hope this fix your issue You shouldn't give the adapter an unprepared list. You should sort and filter the list before you give it to the adapter.Otherwise, you will "confuse" the adapter because elements positions will not be correct (ie element 3 i
TAG : java
Date : January 02 2021, 06:48 AM , By : Ben Brown
What is a regular expression for this?
What is a regular expression for this?
I wish did fix the issue. I would like to detect if a string contains a string like the following. , It seems that your original expression is just fine:
TAG : java
Date : January 02 2021, 06:48 AM , By : Jody Bannon
Can't access variable setter
Can't access variable setter
will be helpful for those in need im having some trouble with this code in java. So Im trying to set a boolean value from another class but im getting this error: "cannot find symbol: setCorrectA" , A setter is a method, you need to call it:
TAG : java
Date : January 02 2021, 06:48 AM , By : Lucyberad
Can I post JSON format in AWS Lambda function?
Can I post JSON format in AWS Lambda function?
help you fix your problem You're attempting to send a LinkedHashMap, as the error and @Mark B says, to the RequestHandler. Instead, "stringify" it into a JSON string first. I recommend one of two libraries for this.Google's GSON library
TAG : java
Date : January 02 2021, 06:48 AM , By : user91848
Complex json to java jackson
Complex json to java jackson
this will help Get and set prefixes are missing in getters and setters for isDeliveryDelay and isShipmentDelay, should be getIsDeliveryDelay() setIsDeliveryDelay(...) I think that you shadowing it by DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES.
TAG : java
Date : January 02 2021, 06:48 AM , By : vferman
How to create a class as immutable in java which is having many fields?
How to create a class as immutable in java which is having many fields?
fixed the issue. Will look into that further The field count here is irrelevant, even if having more than a few fields in one class is horrible design and is a sign the class should be refactored. To make a class immutable, you need the following: No
TAG : java
Date : January 02 2021, 06:48 AM , By : Vinicios
Convert epoch time in UTC to epoch time in another Timezone
Convert epoch time in UTC to epoch time in another Timezone
should help you out Epoch time is an absolute point in time. It is not relative to any timezone. Eg - 6:30 PM in India is same as 1:00 PM in England. The Epoch for both the times is the same.
TAG : java
Date : January 02 2021, 06:48 AM , By : DonMac
Unable to compile maven project in jenkins while it is working fine in the eclipse "Source option 6 is no longer su
Unable to compile maven project in jenkins while it is working fine in the eclipse "Source option 6 is no longer su
I hope this helps you . i am using maven project for the automation, when i execute scripts from eclipse it is working fine when I tries to run scripts from the Jenkins then system shows me an error , with these lines:
TAG : java
Date : January 02 2021, 06:48 AM , By : Hibame
better way to determine quarter boundaries dates
better way to determine quarter boundaries dates
may help you . The IsoFields class of java.time may be a bit overlooked. It’s our friend when it comes to manipulating quarters. Sorry that I can write only Java code.
TAG : java
Date : January 02 2021, 06:48 AM , By : ffmmjj
How can I create dynamic nested loops in java?
How can I create dynamic nested loops in java?
hope this fix your issue I am trying to add array list values in dynamic manner of all combinations using for loop . For example adding two elements combination in an array can be done by nested loop. Similarly 3,4,5,6,7,8 like that combination addit
TAG : java
Date : January 02 2021, 06:48 AM , By : JoeCh
Hashing multiple Strings into one Hash
Hashing multiple Strings into one Hash
will help you If I were you, I would join all strings into one, and then hash that long string.Eg.
TAG : java
Date : January 02 2021, 06:48 AM , By : msg
Getting 401 using themoviedb, and retrofit
Getting 401 using themoviedb, and retrofit
seems to work fine You need to do change like belowchange API_KEY to api_key because in your url key is api_key.
TAG : java
Date : January 02 2021, 06:48 AM , By : ChaseVoid
Perform multiple operations and commit
Perform multiple operations and commit
it helps some times While both ways that you've presented can be viable options, the thing is that at some point in time, the user must somehow say: "Ok, these are are my changes, take them all or leave them". This is exactly what commit is IMO. And
TAG : java
Date : January 02 2021, 06:48 AM , By : Adam
boolean not working correctly with http get result
boolean not working correctly with http get result
it helps some times In Java, when comparing string, use .equals. Please have a try like this.
TAG : java
Date : January 02 2021, 06:48 AM , By : user112141
How to do following operation in Dao implementation?
How to do following operation in Dao implementation?
fixed the issue. Will look into that further I have got an array response from the following code. , First You need to create two classes. CustomResponse Class
TAG : java
Date : January 02 2021, 06:48 AM , By : Cosmin
Increment Counter in Lambda expression
Increment Counter in Lambda expression
I wish this help you I need to write a Lambda function which can auto increment counter value. for example- my counter value is 0. Then, i execute lambda expression which shall increment counter value to 1 , set value 1 to counter and return this cou
TAG : java
Date : January 02 2021, 06:48 AM , By : anov
How to solve Metaspace OOM after redeploying a web application in Tomcat multiple times?
How to solve Metaspace OOM after redeploying a web application in Tomcat multiple times?
hope this fix your issue During a test, I saw the Metaspace almost hit the max, then I stopped to redeploy the web application, and made a heap dump, put it under MAT to analyze.As expected, there are many WebappClassLoader. But I checked it's Path T
TAG : java
Date : January 02 2021, 06:48 AM , By : Marc Dong
Is it possible to set the return type of an abstract method to be the same as the class?
Is it possible to set the return type of an abstract method to be the same as the class?
seems to work fine I would like to set the return type of my abstract method to be the same as the class, not the type of the abstract class, but the same type as the inheriting class. , You can use the self-type pattern:
TAG : java
Date : January 02 2021, 06:48 AM , By : alexmajy
Multiple Endpoints in Cassandra cluster Connection
Multiple Endpoints in Cassandra cluster Connection
fixed the issue. Will look into that further The java driver is resilient to one of the contact points provided not being available. Contact points are used for establishing an initial connection [*]. As long as the driver is able to communicate with
TAG : java
Date : January 02 2021, 06:48 AM , By : Adam May
Create an Array of Objects from Arrays in Java
Create an Array of Objects from Arrays in Java
I think the issue was by ths following , A basic for loop could solve all your problems I believe.Just make sure you make your implementations/declarations before.
TAG : java
Date : January 02 2021, 06:48 AM , By : Tom Berthon
Is it possible to require that subclasses of an abstract class override inherited methods of a superclass?
Is it possible to require that subclasses of an abstract class override inherited methods of a superclass?
this one helps. I wrote an abstract class for which I am certain that all subclasses will need to override .equals and .hashCode to be useful. The abstract class does not however have the information required to itself override these methods. Is it p
TAG : java
Date : January 02 2021, 06:48 AM , By : user183275
java.time: the simplest way to get a difference in hours between two LocalTime objects
java.time: the simplest way to get a difference in hours between two LocalTime objects
I think the issue was by ths following , Duration is the wrong class. There is zero duration between "now" in one time zone and "now" in another. For a fun but memorable way to think about this, see here.You appear to be seeking to know the current o
TAG : java
Date : January 02 2021, 06:48 AM , By : user113409
Java object destructuring
Java object destructuring
hop of those help? As far as i know, java doesn't support this.Other JVM language called Kotlin does support this
TAG : java
Date : January 02 2021, 06:48 AM , By : ezzze
cannot covert from a data type to an array data type
cannot covert from a data type to an array data type
Any of those help As the error message says, you cannot assign Array element to array object
TAG : java
Date : January 02 2021, 06:48 AM , By : Ernie
JAXB binding 3 level nested elements
JAXB binding 3 level nested elements
Hope that helps Option 1 One pure JaxB way to do this is via defining your adapter for Options element. The adapter is used to more or less turn any xml into any object and vice versa (Custom marshaling).
TAG : java
Date : January 02 2021, 06:48 AM , By : Alex Bartzas
How do I change the action of a JButton after it's been clicked?
How do I change the action of a JButton after it's been clicked?
seems to work fine I want to change the behavior of a JButton after it's been clicked. , You can use a boolean flag for that e.g.
TAG : java
Date : January 02 2021, 06:48 AM , By : user158193
Polymorphism in Java with Services
Polymorphism in Java with Services
may help you . You could parametrize your enum with a Supplier, e.g.:
TAG : java
Date : January 02 2021, 06:48 AM , By : Theo
Array to Map through for loop
Array to Map through for loop
hope this fix your issue I know its a very trivial issue, but I still need some help. I have an array and I want to get its element into a map. , what about this?
TAG : java
Date : January 02 2021, 06:48 AM , By : John Studdert
How can I prevent Wicket AutocompleteAjaxComponent from escaping  ?
How can I prevent Wicket AutocompleteAjaxComponent from escaping  ?
Any of those help Easiest solution is to use the unicode-escape \u00A0 instead of nbsp;, as that won't be escaped by AbstractAutoCompleteTextRenderer.
TAG : java
Date : January 02 2021, 06:48 AM , By : Hans-Inge
CORS : Response to preflight request doesn't pass access control check: Redirect is not allowed for a preflight request
CORS : Response to preflight request doesn't pass access control check: Redirect is not allowed for a preflight request
will be helpful for those in need Your backend is redirecting (302) instead of sending a proper response (200) to the OPTIONS/preflight request. Check your backend logs to see why it is redirecting. It may be something like Spring security denying th
TAG : java
Date : January 02 2021, 06:48 AM , By : Ivan Kitanovski
Using the split function in a proper way
Using the split function in a proper way
hope this fix your issue You can play with the following. I omit error checks for the sake of simplicity.
TAG : java
Date : January 02 2021, 06:48 AM , By : Anand
Is it correct application of the SRP(single responsibility principle)?
Is it correct application of the SRP(single responsibility principle)?
will help you I'm sorry for being blunt, my eyes are bleeding while looking at this. You took one unnecessarily complicated validation model and you split it in two to make it even more complicated. And none of it has much to do with the Single Respo
TAG : java
Date : January 02 2021, 06:48 AM , By : S Hall
How do you count the amount of times a method is called?
How do you count the amount of times a method is called?
wish help you to fix your issue This is a very simple Java code and I want to write a code that counts how many times the step method is called. Essentially, this code will draw a blob and count how many "steps" the blob takes. If the step number is
TAG : java
Date : January 02 2021, 06:48 AM , By : Steve Jones
How to send a file greater than 25 MB using Java Mail API
How to send a file greater than 25 MB using Java Mail API
wish help you to fix your issue The user friendly way is probably to upload the file somewhere and add a link to the file in the mail.It's also possible to split the file in several smaller parts and send each part in its own mail. The recipient then
TAG : java
Date : January 02 2021, 06:48 AM , By : kuba53280
Spring - inject vavr collections
Spring - inject vavr collections
wish helps you You are correct that Spring only supports injecting JDK collections of spring beans. You can work around this with a kind of a bridge @Bean factory method in one of your @Configuration classes, similar to this:
TAG : java
Date : January 02 2021, 06:48 AM , By : chudq7
Does not iterate through the class that implement Iterable
Does not iterate through the class that implement Iterable
hope this fix your issue The problems were in your main method. After few simple fixes this works:
TAG : java
Date : January 02 2021, 06:48 AM , By : vitorcoliveira
Cassandra Pagination Using Datastax driver 3.6: Null paging state and fetch size not honoured
Cassandra Pagination Using Datastax driver 3.6: Null paging state and fetch size not honoured
help you fix your problem As you were able to discern, the reason you are getting all results back despite the fact that you are specifying setFetchSize is because fetch size simply sets the requested size of each requested page. When you invoke all(
TAG : java
Date : January 02 2021, 06:48 AM , By : pdkent
Creating a new instance of implemented class, based on argument class type
Creating a new instance of implemented class, based on argument class type
seems to work fine You want to implement the factory method pattern:
TAG : java
Date : January 02 2021, 06:48 AM , By : Don Changer
Thread class does not contain constructor which takes Object class as parameter
Thread class does not contain constructor which takes Object class as parameter
To fix the issue you can do The Thread constructor takes an Runnable as parameter. Your class implements the Runnable so it can be given to the constructor because the class is an Runnable after implementing it.
TAG : java
Date : January 02 2021, 06:48 AM , By : Pieter Taelman
Implement Sorting for order
Implement Sorting for order
hope this fix your issue Instead of thinking about the filters as individual filters think of them as a bulk. You get the list of filters you re-arrange them in a new list. You are satisfied with the order then you update all of them instead of one b
TAG : java
Date : January 02 2021, 06:48 AM , By : judith
Null Pointer exception while initialize@ PostConstruct method
Null Pointer exception while initialize@ PostConstruct method
like below fixes the issue I am getting NullPointerException while initializing @PostConstruct method , Try changing (user == null) to (user != null)
TAG : java
Date : January 02 2021, 06:48 AM , By : user118656
Cannot resolve method 'displayMessage(java.lang.String)'
Cannot resolve method 'displayMessage(java.lang.String)'
I think the issue was by ths following , System.out.println does work in Android Studio 3.4.1 but you can't see the output on emulator or any physical device. Result will be displayed on Logcat as I/System.out:.com.example.printdemo I/System.out: Tes
TAG : java
Date : January 02 2021, 06:48 AM , By : Verbal
JavaFX FXML - Button with icon and text
JavaFX FXML - Button with icon and text
To fix this issue I would like to include buttons with icon and text using FXML. , You could do something like this in fxml
TAG : java
Date : January 02 2021, 06:48 AM , By : Alpinfish
JavaFX - Add space between buttons via CSS
JavaFX - Add space between buttons via CSS
this one helps. I am trying to add some space between buttons in JavaFX using CSS. I know that separator element can do that, but I prefer to use it to separate logical groups of buttons. , If you give an ID then try
TAG : java
Date : January 02 2021, 06:48 AM , By : warttack
MS Access won't update table after execution of INSERT INTO query through ucanaccess in java
MS Access won't update table after execution of INSERT INTO query through ucanaccess in java
To fix the issue you can do UCanAccess doesn't support Shared Mode on Access databases.That's explained here on the UCanAccess blog.
TAG : java
Date : January 02 2021, 06:48 AM , By : cautionsign
Hitting low Java thread limit (503 threads)
Hitting low Java thread limit (503 threads)
wish helps you Turns out it was a systemd issue.systemd introduced a limit on the number of threads for a single process which defaulted arbitrarily to 512 threads. I think our 503 limit in testing was actually
TAG : java
Date : January 02 2021, 06:48 AM , By : msugar
How to split list
How to split list
wish help you to fix your issue If you need to create a new list in which the elements are the words from the previous list of phrases, you could do:
TAG : java
Date : January 02 2021, 06:48 AM , By : nseibert
Operations on properties in Java Class
Operations on properties in Java Class
To fix this issue Is there a cleaner way to do this via Java 8 like lambda or streams?
TAG : java
Date : January 02 2021, 06:48 AM , By : s8k
Asynchronous Java: How to return this without blocking?
Asynchronous Java: How to return this without blocking?
I think the issue was by ths following , Setup:
TAG : java
Date : January 02 2021, 06:48 AM , By : user177910
Merging two different data type of array list in to a single array list
Merging two different data type of array list in to a single array list
I wish did fix the issue. Your best bet is to create a class that will store the type of bulb and manufacturer id. Then create an array list (or a simple array) of your new class to store the data.
TAG : java
Date : January 02 2021, 06:48 AM , By : cynix
Redis: Set different time to live for methods annotated with @Cacheable
Redis: Set different time to live for methods annotated with @Cacheable
wish helps you Hi if you want to use only Spring annotations one way to do this is the following. @CacheConfig annotation allows you to define specific CacheManager to use further more the @Cacheable annotation also allows defining cacheManager
TAG : java
Date : January 02 2021, 06:48 AM , By : Nougat
How to distinguish between true and false with partitioningby?
How to distinguish between true and false with partitioningby?
wish help you to fix your issue I am using java streams to separate the values "true" and "false" according to a certain condition, but they are all values counted as "false" I have this code: , You can repeat the pattern as:
TAG : java
Date : January 02 2021, 06:48 AM , By : wpoch
How to find the smallest number that is common among the 3 arrays?
How to find the smallest number that is common among the 3 arrays?
I hope this helps you . A slightly different approach: turn the shortest array into a sorted set turn the two other arrays into ordinary sets iterate that sorted set, and for each entry, check if the other two sets contain it.
TAG : java
Date : January 02 2021, 06:48 AM , By : Thx1138.6
How to make a JPA Column insertable only during JUnit tests?
How to make a JPA Column insertable only during JUnit tests?
like below fixes the issue You could create a orm.xml in the test/resources/META-INF directory and override the mapping with XML.The tags in the XML are the same as the annotations but instead of camel-case in kebab-case.
TAG : java
Date : January 02 2021, 06:48 AM , By : nabbed
JavaFX: How to move 2 Rectangles at the same time?
JavaFX: How to move 2 Rectangles at the same time?
hop of those help? You need to capture KeyCodes. Use up, down, z, and x to control paddles. More comments in the code! Here is a working example.
TAG : java
Date : January 02 2021, 06:48 AM , By : Stuka

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