Questions tagged [java]
Java is a high-level object-oriented programming language. Use this tag when you're having problems using or understanding the language itself. This tag is frequently used alongside other tags for libraries and/or frameworks used by Java developers.
1,919,439
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Improve performance of method (in Java)
I need to improve the performance of my code. I have the following code:
public List<ArticoliDett> settaArticoliPreSalvataggio(Iterator iteratore){
try{
List<ArticoliDett&...
- 2,093
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4
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JavaFX won't initialize views
I've encountered with issue that JavaFX won't initialize any view or container by fx:id.
And it throws NullPointerException with reference at object that i've already initialized.
For an example i've ...
- 81
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Data Migration of multiple tables from one database to other using Spring Boot and Spring Batch
I want to migrate from one database to other using Spring Batch and Spring Boot. I have learnt that we have to declare @Bean for step, Job, JobLauncher, ItemWriter, ItemReader. But for those beans to ...
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Java: json object key returns 2 values, how to access these values individually?
This is my code:
JSONObject jsonObjectQL = new JSONObject(qlResponse.asString());
System.out.println("print2: " + jsonObjectQL);
Object graphqlValue =
WorkplaceEmployerGraphModelObject....
- 121
-4
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Are persistence providers still typically used in Java nowadays?
I started learning hibernate like a month ago and the course I got on Udemy seems to use some outdated things like hibernate.cfg.xml files. I noticed some problems rely on persistence.xml files too, ...
-3
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17
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Problen In I18n internationalization converting hindi language
I am developing a mini project using springBootMVC I18n internationalization concept. when i convert Hindi or Chinese language in browser ???? are come. But in other languages like France, German ...
-1
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1
answer
25
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Jackson INDENT_OUTPUT doesn't format properly - what am I doing wrong?
I've been trying to figure this out for a bit but couldn't pin-point my mistake.
I have a JSON I'd like to read into Java objects, manipulate those objects, then write them to a new JSON.
Code looks ...
- 31
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Is it thread-safe by default to have nested CopyOnWriteArrayList?
Lets imagine I have the following code:
class ClassA {
final Integer i;
final String;
final CopyOnWriteArrayList<ClassB> l;
ClassA() { ...
}
}
class ClassB {
final ...
- 81
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9
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Android How to add pagination into AutoCompleteTextView
can you please help for how to handle pagination into AutoCompleteTextView, i have show data as dropdown list using custom adapter like this.
SearchDropdownAdapter searchDropdownAdapter = new ...
- 1,592
1
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2
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47
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I want to know the space complexity of this function
I was writing this code, and I am confused about whether the space complexity of this question is O(N) or O(N^2).
This is the function whose complexity i want to know:
static pair[] allPairs(int x, ...
- 19
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1
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How to Detect Unsecured Wifi Android
WifiInfo class provides getCurrentSecurityType function but it is available only for API level 31 & above.
private static void detectUnsecureWifiNetwork(Context context) {
WifiManager ...
- 55
0
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1
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18
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IntelliJ's GridLayoutManager doesn't shrink its children
Here's a simple demo. The main class displays a frame with a GridLayoutManager-managed panel. The panel contains a stack of JLabels with long text strings
I expect the labels to shrink as I shrink the ...
- 185
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10
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How to run Sencha Cmd 7.8.0.59 on linux
After upgrading the java to version 17, I have to install the sencha 7.8 version. But in compare with other versions there is no way to choose Sencha CMD with jre included or not. So the versions ...
- 2,238
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Polling data from kafka topic giving exception
I am trying to poll data from a kafka topic- "topic-a". I am trying ot poll that using kafka consumer listener. I have provided the below details in the application.yaml file for kafka ...
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Array Index Out Of Bound Error for Finding an element in an infinite array by Kunal Kushwaha video
My Code
public class InfiniteElement{
public static void main(String[] args) {
int[] arr = {1, 2, 4, 6, 8, 9, 10 , 13, 16, 19, 20 ,23, 27, 40, 42, 44};
int target = 44;
...
