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JAVA QUESTIONS

What is wrong with my Havel-Hakimi Algorithm code?
What is wrong with my Havel-Hakimi Algorithm code?
I wish this help you The problem is with Collections.sort(temp), it sorts the input collection in ascending order, while you want it to be sorted in descending order. You can use Collections.sort(temp, Collections.reverseOrder())That was the logical
TAG : java
Date : January 02 2021, 06:48 AM , By : Kristian Hofslaeter
create liquibase changeset validation rules
create liquibase changeset validation rules
like below fixes the issue Have you considered introducing code reviews instead? On the other hand if your goal is not to forbid using dropColumn, but to annotate it to make sure that developer knows what he/she is doing then you could introduce two
TAG : java
Date : January 02 2021, 06:48 AM , By : user182203
How do i call this Ffun() and access this class?
How do i call this Ffun() and access this class?
hop of those help? You can't do that, without changing the code.There is no way to tell the outer world about a local class defined in a method.
TAG : java
Date : January 02 2021, 06:48 AM , By : firebasket
Exception in thread "main" java.lang.NoSuchMethodError: scala.Predef$.longArrayOps([J)[J
Exception in thread "main" java.lang.NoSuchMethodError: scala.Predef$.longArrayOps([J)[J
I think the issue was by ths following , this is clear version issue. nothing else even though you are claiming to use 2.12.x seems like its pointing to old version of scala try to clean and build. verify dependencies in maven or sbt which ever you a
TAG : java
Date : January 02 2021, 06:48 AM , By : Daniel Reslie
Android WebView failed to load (net::ERR_CLEARTEXT_NOT_PERMITTED)
Android WebView failed to load (net::ERR_CLEARTEXT_NOT_PERMITTED)
should help you out cleartext is disabled in android 9 so you must add network securityAdd src\main\res\xml\network_security_config.xml with the following content:
TAG : java
Date : January 02 2021, 06:48 AM , By : phatfish
How to read or write file as getExternalStorageDirectory is deprecated in API 29?
How to read or write file as getExternalStorageDirectory is deprecated in API 29?
Any of those help From the docs you can see:
TAG : java
Date : January 02 2021, 06:48 AM , By : Cenneca
How can I make an app dark and light theme?
How can I make an app dark and light theme?
it should still fix some issue I think you are on a good track, you would define different styles for each and every theme, something like this:
TAG : java
Date : January 02 2021, 06:48 AM , By : bdurbin
Getting Time limit exceeded error in java
Getting Time limit exceeded error in java
will be helpful for those in need You’re code is not correct.If you were meant to count the even and odd numbers in a, then you are counting the even numbers correctly. If n is not equal to the length of a, then your calculation of the count of odd n
TAG : java
Date : January 02 2021, 06:48 AM , By : Jonathan
Usage of @Valid vs @Validated in Spring
Usage of @Valid vs @Validated in Spring
will be helpful for those in need It works when using Validated and doesn't when using Valid simply because Spring Boot requires properties classes to be annotated with Validated if you want them to be validated. See the documentation:
TAG : java
Date : January 02 2021, 06:48 AM , By : John Phipps
How to apply filter to get specified data from data.gov.in api?
How to apply filter to get specified data from data.gov.in api?
seems to work fine I have used filters in different API like below to pass in querystring, filters[state]=Gujaratfilters[district]=Banaskanth It works perfectly.
TAG : java
Date : January 02 2021, 06:48 AM , By : barefootChild
How to pass Java options/variables to Springboot app in docker run command
How to pass Java options/variables to Springboot app in docker run command
it should still fix some issue Make use of application.properties in springboot to override any variables from outside. We heavily use this in our production environments.You need to:
TAG : java
Date : January 02 2021, 06:48 AM , By : kaart
Google Cloud SQL-Unable to connect to MySQL database
Google Cloud SQL-Unable to connect to MySQL database
Does that help once I had the same issue (I know how painful it is) and as much as I would I dont have to much experience with java but this is what I can tell you about how I connect cloud-sql with app-engineBe aware of this two things:
TAG : java
Date : January 02 2021, 06:48 AM , By : robinator
Variable resets to default value between onClickListeners
Variable resets to default value between onClickListeners
Does that help It looks like you have two currentAssessment variables. One that is private to the class and another that is confined to the scope of onItemClick. Once onItemClick exits you've lost that assignment, and anywhere else where you're refer
TAG : java
Date : January 02 2021, 06:48 AM , By : Hadley
Sort integer array using comparator interface and lambda expression
Sort integer array using comparator interface and lambda expression
Hope that helps There are no overrides of Arrays::sort that take an array of primitives and a lambda as a parameter.
TAG : java
Date : January 02 2021, 06:48 AM , By : besn
Java Date Time Start and End of day without any TimeZone information
Java Date Time Start and End of day without any TimeZone information
seems to work fine The Z at the end is time zone information, meaning offset 00:00 from UTC, aka Zero, aka Zulu, so first you parse the string into a type that stores date, time, and the Z timezone. With Java 8 Time API, that would be Instant, Offset
TAG : java
Date : January 02 2021, 06:48 AM , By : jedameron
ConcurrentModificationException when trying to sum numbers of an Arraylist using multiple threads in Java
ConcurrentModificationException when trying to sum numbers of an Arraylist using multiple threads in Java
should help you out The problem is happening because your methods are synchronized in "object level", I mean, the monitor lock it uses is of a particular object (tst1,tst2,tst3). In other words, each synchronized method is using a different lock. Cha
TAG : java
Date : January 02 2021, 06:48 AM , By : Stephen Dewar
Sorting in java reverseOrder
Sorting in java reverseOrder
To fix the issue you can do Here is an example of a custom Comparator method for sorting the way you want:
TAG : java
Date : January 02 2021, 06:48 AM , By : user150744
JPA auto flush before any query
JPA auto flush before any query
should help you out As JPA is a specification this question is simple to answer. Check out the spec :-)3.10.8 Queries and Flush Mode
TAG : java
Date : January 02 2021, 06:48 AM , By : Joe
How to properly implement observable list to populate a combobox
How to properly implement observable list to populate a combobox
With these it helps Your code will not even compile as written. You are trying to pass a String to your FXCollections.observableArrayList() method. That method does not accept a String argument.To create a proper ObservableList, you need to pass an a
TAG : java
Date : January 02 2021, 06:48 AM , By : smbrant
Passing values from Java action to next Java action in Oozie workflow
Passing values from Java action to next Java action in Oozie workflow
like below fixes the issue A Google search on oozie capture_output java points straight to the Java Cookbook section "Capture-output element", quoting: In this example, we pass a the PASS_ME variable between the JAVA action and the PIG action. The PA
TAG : java
Date : January 02 2021, 06:48 AM , By : dnyaneshwar
Jmeter - Unable to run 1000 concurrent users per/sec
Jmeter - Unable to run 1000 concurrent users per/sec
should help you out Looking into Active: 7 summarizer output you seem to have not more than 7 active users. Given you have only 2 Samplers and only 3 loops defined under the Thread Group my expectation is that you're simply not achieving the desired
TAG : java
Date : January 02 2021, 06:48 AM , By : Brandon
Control Flow Explanation
Control Flow Explanation
it helps some times Write a method named hasSharedDigit with two parameters of type int. , This here:
TAG : java
Date : January 02 2021, 06:48 AM , By : Scott Everts
Opening a .pdf link in a Webview
Opening a .pdf link in a Webview
this one helps. When you click a link to a .PDF the webview will try to download the file. What you really want to do is open the file in an external browser session. That will display the PDF, and also give you the choice to download it if you wish.
TAG : java
Date : January 02 2021, 06:48 AM , By : tlync
How to set 301 status code in actionResponse in Liferay MVC portlet
How to set 301 status code in actionResponse in Liferay MVC portlet
like below fixes the issue There are 2 problems to look at here, First, check if you are not setting the code after send redirect commits the response. Second, to set a code like that, you might want to try something like the following:
TAG : java
Date : January 02 2021, 06:48 AM , By : George Handlin
What To Unit Test
What To Unit Test
wish of those help There's no right answer, and it's a matter of personal opinion and feelings.However, some things I believe are universal:
TAG : java
Date : January 02 2021, 06:48 AM , By : Chris Tattum
How to fix repast simphony error : saf.v3d.scene.VComposite.addChild(VComposite.java:46)
How to fix repast simphony error : saf.v3d.scene.VComposite.addChild(VComposite.java:46)
around this issue This error can occur if the getVSpatial method in the style for child agent returns null. JavaDoc for getVSpatial
TAG : java
Date : January 02 2021, 06:48 AM , By : Liy
How to decide on jdk version - Oracle's shorter release cycle
How to decide on jdk version - Oracle's shorter release cycle
hop of those help? In the past, Java major releases often tended to be loaded with far-reaching features that had a massive impact on the code that you could and should write, like generics (Java 5), functional constructs (Java 8), and modules (Java
TAG : java
Date : January 02 2021, 06:48 AM , By : Schmidt
What would happen if I run parallel code in a multi-threading server program?
What would happen if I run parallel code in a multi-threading server program?
hop of those help? The crucial difference between concurrency and parallelism is that concurrency is about dealing with a lot of things at same time (gives the illusion of simultaneity) or handling concurrent events essentially hiding latency. On the
TAG : java
Date : January 02 2021, 06:48 AM , By : vbanos
Save state of toggle button
Save state of toggle button
To fix the issue you can do Use SharedPreferences, it is just a file with KEY-VALUE logic that saves some simple data on it. SharedPreferences is mostly used for flags(as your case) or to store simple other settings/informations:
TAG : java
Date : January 02 2021, 06:48 AM , By : WuJanJai
How to get Json Array in Json Object using volley in android and set this json data in listview code and Xml Avilavble
How to get Json Array in Json Object using volley in android and set this json data in listview code and Xml Avilavble
I wish this help you I am using volley for JSON parsing. I want to get some data using GET from server side, that I tried to send. Can any one tell me how? Following is my codes. I also tried HashMap and JSONobject but getting this error. , use :
TAG : java
Date : January 02 2021, 06:48 AM , By : Ansari
How to allow only !@#$%^&* in a string using java
How to allow only !@#$%^&* in a string using java
This might help you I want to allow only above mentioned special characters. , Try this:
TAG : java
Date : January 02 2021, 06:48 AM , By : Bado
Element type "hibernate-mapping" must be declared
Element type "hibernate-mapping" must be declared
I wish did fix the issue. I have around 75 .hbm.xml files in my project. Out of 75 files 4 files were using , In mapping, I replace by:
TAG : java
Date : January 02 2021, 06:48 AM , By : Amit Battan
Setup Tomcat for multiple websites in one server (linux)
Setup Tomcat for multiple websites in one server (linux)
Does that help You can create VirtualHosts to setup multiple websites with multiple domain names in one server. You can try out same in tomcat 7, 8 and in 9 as well. 1.Edit your relevant server.xml file and include Virtual hosts as below.Make sure to
TAG : java
Date : January 02 2021, 06:48 AM , By : mansoor
compile groovy classes on the fly
compile groovy classes on the fly
I hope this helps . It is using GroovyClassLoader. There are some caveats that I've run into when dealing with Static class fields and cross-references, but I basically use this setup on a couple of my projects. You may have to watch loading order in
TAG : java
Date : January 02 2021, 06:48 AM , By : Jay Crockett
Java 8 timezone API get next transition not returning DST change in Moscow 1991
Java 8 timezone API get next transition not returning DST change in Moscow 1991
Any of those help Your observations are correct.One way to confirm the change in March 1991 is: on the Time Zone and Clock Changes page of timeanddate.com (see the link at the bottom), select 1990 - 1999 from the dropdown. I quote:
TAG : java
Date : January 02 2021, 06:48 AM , By : arbeitandy
Escaping quotes using jackson-dataformat-xml
Escaping quotes using jackson-dataformat-xml
like below fixes the issue Here's how the problem was solved. I used woodbox Stax2 extension. This helped a lot. https://github.com/FasterXML/jackson-dataformat-xml/issues/75
TAG : java
Date : January 02 2021, 06:48 AM , By : Ivan Belov
Multiple Activity app crashes after button press
Multiple Activity app crashes after button press
I think the issue was by ths following , You should delete the line with this.finish(). Cause finish() method quits the activity.
TAG : java
Date : January 02 2021, 06:48 AM , By : techthumb
How to read data from usb device on Android?
How to read data from usb device on Android?
seems to work fine You can start with Android Developer documentation USB HOST MODE to understand how to communicate over USB.You should start with the section USB host overview.
TAG : java
Date : January 02 2021, 06:48 AM , By : user183289
correcting the return type of the method
correcting the return type of the method
hop of those help? Seems you want your method to return true when an object is deleted, and false when object is not found.The method you are calling is void because is uses exception ResourceNotFoundException to indicate object not found, so you nee
TAG : java
Date : January 02 2021, 06:48 AM , By : vbanos
Use spring-data-elasticsearch annotations with Jackson ObjectMapper?
Use spring-data-elasticsearch annotations with Jackson ObjectMapper?
I hope this helps . With Elasticsearch you can either let it define mappings automatically using Dynamic Mapping (you persist your docs and ES builds mapping according to it input), or you can define your schema prior to indexing by sending ES with r
TAG : java
Date : January 02 2021, 06:48 AM , By : vitorcoliveira
java.lang.ArrayIndexOutOfBoundsException at index "1", size "1" when I click on favorite icon
java.lang.ArrayIndexOutOfBoundsException at index "1", size "1" when I click on favorite icon
With these it helps The indices of a size 1 array are {0}, if the array were size 5 the indices would be {0, 1, 2, 3, 4}. The index of an array only goes up to its length - 1, you're trying to place an item at index 1 of an array that only has index
TAG : java
Date : January 02 2021, 06:48 AM , By : user158193
Is there a shortcut to add exceptions to a method signature in Eclipse?
Is there a shortcut to add exceptions to a method signature in Eclipse?
hop of those help? When you hover your mouse over the statement, you will get the below popup. You just have to click on the Add throws declaration link
TAG : java
Date : January 02 2021, 06:48 AM , By : vbanos
Univocity - Detect missing column when parsing CSV
Univocity - Detect missing column when parsing CSV
fixed the issue. Will look into that further So since my main issue here is to make sure that the headers count is the same as the number of columns provided in the CSV file, and since I'm using an iterator to iterate over records, I've added a check
TAG : java
Date : January 02 2021, 06:48 AM , By : Jeskl
Projects Directory Structures | Why?
Projects Directory Structures | Why?
wish helps you Main question , What's the main idea behind the structure?
TAG : java
Date : January 02 2021, 06:48 AM , By : Raghaw
Does Java monitor's wait set has a priority over entry set?
Does Java monitor's wait set has a priority over entry set?
Any of those help No. The scheduler is in charge of which thread gets the lock next. It might be one from the wait set that got notified. It might be a thread that is just arrived and hasn't entered the wait set. Assuming the thread that just got not
TAG : java
Date : January 02 2021, 06:48 AM , By : Harry Truman
Is it possible to remove elements in a string array, that isn't a number, whilst in a for loop?
Is it possible to remove elements in a string array, that isn't a number, whilst in a for loop?
fixed the issue. Will look into that further I am trying to find the largest number in a string array that includes letters. How do I remove elements that aren't numeric from the array, whilst its in a For loop? , you can use Java 8 stream for this
TAG : java
Date : January 02 2021, 06:48 AM , By : tlync
"Feature not supported" error when using the method first() of ResultSet
"Feature not supported" error when using the method first() of ResultSet
I think the issue was by ths following , The problem is NOT that first is not supported by the database.The problem is that it is not supported for this resultset. The code for the HSQLDB JDBCResultSet::first looks like this:
TAG : java
Date : January 02 2021, 06:48 AM , By : AJacques
Error: 1553 - AQL: bind parameter '@myParameter' has an invalid value or type (while parsing) - ERROR_QUERY_BIND_PARAMET
Error: 1553 - AQL: bind parameter '@myParameter' has an invalid value or type (while parsing) - ERROR_QUERY_BIND_PARAMET
it fixes the issue I have the following query: , Non-collection parameters require a single @
TAG : java
Date : January 02 2021, 06:48 AM , By : Bruce
I need to pass a condition as an argument
I need to pass a condition as an argument
around this issue You can use a Predicate for this. A Predicate is a boolean-valued function. This way you can test against your value until the condition is met.
TAG : java
Date : January 02 2021, 06:48 AM , By : user183954
Calendar work in all the year except in July
Calendar work in all the year except in July
fixed the issue. Will look into that further If you can use the actual day of the week - consider using LocalDate (Java 8+) if possible:
TAG : java
Date : January 02 2021, 06:48 AM , By : Ian
I Need to Implement Volume change Functionality + Screen Brightness Adjustment On Swipe/Movement on Screen Touch
I Need to Implement Volume change Functionality + Screen Brightness Adjustment On Swipe/Movement on Screen Touch
I wish this helpful for you Volume Controladd permission android.permission.MODIFY_AUDIO_SETTINGS to your AndroidManifest.xml
TAG : java
Date : January 02 2021, 06:48 AM , By : JulianCT
What are some real uses cases for the methods skip and reset in BufferedReader?
What are some real uses cases for the methods skip and reset in BufferedReader?
will be helpful for those in need I haven't used them myself, but a case that springs to mind is where you want to copy the data into a structure that needs to be sized correctly.When reading streams and copying data into a target data structure (per
TAG : java
Date : January 02 2021, 06:48 AM , By : S. Fenz
Maven: "NoClassDefFoundError: com/jogamp/newt/event/KeyListener"
Maven: "NoClassDefFoundError: com/jogamp/newt/event/KeyListener"
seems to work fine Maven does not package the dependency classes in the final .jar. Some options: Manually add the dependencies to your classpath with the -classpath flag (How to run a java class with a jar in the classpath?). Use Maven exec plugin w
TAG : java
Date : January 02 2021, 06:48 AM , By : Steve M
Is there a way to create a batch job in dataflow which reads from a pubsub topic?
Is there a way to create a batch job in dataflow which reads from a pubsub topic?
I hope this helps . You can look into using BoundedReadFromUnbounded source that allows to convert unbounded collection to bounded.
TAG : java
Date : January 02 2021, 06:48 AM , By : xguru
Android Value ListView Kotlin
Android Value ListView Kotlin
I wish did fix the issue. How to migrate Java to kotlin? , you could do it like this
TAG : java
Date : January 02 2021, 06:48 AM , By : qba73
@AutoConfigureWebTestClient(timeout = "600000") has no effect
@AutoConfigureWebTestClient(timeout = "600000") has no effect
Hope this helps I think that annotation does not work in your setup, since by default the timeout is already 5 seconds, how about trying the other answer of that linked question?
TAG : java
Date : January 02 2021, 06:48 AM , By : Franky
How can I start a new activity in a ScreenSlidePagerAdapter?
How can I start a new activity in a ScreenSlidePagerAdapter?
wish help you to fix your issue You should write the startactivity code inside last showing fragment of adapter. (If you are using instances of same fragment, then you have to pass the position from adapter to fragment while creating it.
TAG : java
Date : January 02 2021, 06:48 AM , By : George H.
how to display number without comma java
how to display number without comma java
Hope this helps You can simply use String::replaceSystem.out.println (i.replace (",", ""));
TAG : java
Date : January 02 2021, 06:48 AM , By : Kocur
Adding an Admob banner to a listview every X rows
Adding an Admob banner to a listview every X rows
it helps some times This can be achieved in many ways. The simplest one is adding the adview inside the list item layout itself and making it visible or invisible from onBindViewHolder. You can add an additional integer variable say 'viewType' to the
TAG : java
Date : January 02 2021, 06:48 AM , By : demize95
Is there a way to find a word by searching for only part of it?
Is there a way to find a word by searching for only part of it?
it fixes the issue I need to take a phrase that contains a specific word, then if it does have that word even if it's part of another word, to print the entire word out. , Use regex for a 1-liner:
TAG : java
Date : January 02 2021, 06:48 AM , By : Jµ.

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