I’ve built simple client-server model using sockets. The server receives 1 type of request: 2 numbers from client, sums them, waits for 5 seconds and sends the response back to the client. I’m trying to send 20 asynchronous request from the client without waiting for response. The client should su…
Tag: java
How to response with JSP file using JAX-RS?
I’ve just started learning Java. I’m trying to create a simple CRUD web application using JAX-RS. I’d like to have a few pages with forms that will be sending data to my API resources. Unfortunately, I don’t understand how I can render an html page using JAX-RS. Perhaps there is anothe…
Can someone explain how WebDriver casting to TakesScreenShot in Selenium working
This is a JAVA conceptual question, not related to Selenium. For a sample code like : When I observe, WebDriver and TakesScreenshot do not share a common super interface. In that case how can casting be valid and why not a ClassCastException? It would be really great if this can be explained with an example. …
Factory pattern using generics
I would like to build a class that caches classes of type CachedObject using Map. Below is the factory class. I have a class that extends CacheableObject as below: When I try to create an instance of class X that extends CachedObject using the get method in the factory as below: (please note that cachedObject…
Efficient way to get line number of bunch of string from a file
I want to search a list of strings from the file and get the line number. I am looking for an efficient way to do it. I don’t want to search one string at a time and open and close file. Answer Store the line numbers where each String appears in the file using a HashMap<String, List<Integer>>…
What’s the difference between String.format() and str.formatted() in Java?
I know that method String.format() is nearly the same as method System.out.printf() except it returns a String. But I could hardly find the introduction about method “formatted” which is defined as follows: And I know the functions of two codes below are the same. Therefore I’m wandering wha…
Selenium And Java: Exception in thread “main” org.openqa.selenium.NoSuchWindowException: no such window: target window already closed
I am accessing a Quebec Laws website and I am trying to web scrape all of its law names along with their associated PDFs. When doing this, I open each and every tab of each law and then go through all those tabs to get the information I am looking for. However, after a while of going through the tabs
Selenium 4 : Getting java.lang.NoSuchMethodError: org.openqa.selenium.WebElement.getDomAttribute(Ljava/lang/String;)Ljava/lang/String;
I am using selenium “4.1.2” with chrome 97. While selecting value from drop down using select class, getting exception: Below are dependencies in my project: Any help in resolving this issue is highly appreciated. Answer This error message… …is the result of dependency version conflict…
Function to check for perfect square not working for large number
I came across an algorithm to tell if a given number is perfect square or not in O(logN) time. Here is the implementation(JAVA) of the idea. This works fine for numbers like 256, 808201 , etc But fails for numbers like 999966000289. I cannot figure out why? Answer As mentioned in the comments, the problem is …
NoArgsConstructor and AllArgsConstructor annotation on Child class for parent constructors
Hello to the overflow community, I am struggling on an inheritance problem with Lombok. I’m trying to add both annotation @AllArgsConstructor and @NoArgsConstructor on a child class in order to use the parent lombok constructors but got the error “Duplicate method Child()”. Parent class: Chi…