JAVA QUESTIONS

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

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

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?

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

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?

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?

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

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?

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

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?

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

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

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

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?

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

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

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

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

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?

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

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?

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?

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

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

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?

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

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

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

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

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?

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

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

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  ?

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

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

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)?

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?

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

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

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

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

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

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

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

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

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)'

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

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

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

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)

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

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

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?

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

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

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?

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?

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?

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?

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