Tag: java

Why is one able to assign a list of child type to a list of its superclass type, in Kotlin?

I have read topics on Generics and Wildcards in Kotlin and also their differences compared with Java, I have tried to search online, but I couldn’t find the answer to this question nor make sure if anyone has asked it. I’ve got the class Note and the class FavouriteNote, derived from the class Note. I’ve also got an array list

Change in LIMIT clause while upgrading jooq from 3.14.6 to 3.17.5

I am trying to upgrade JOOQ from 3.14.6 to 3.17.5. I am observing that generated SQL across two versions are different Jooq 3.14.6 In Jooq 3.17.5 Can someone let me know If there are any settings in jooq codegen (version 3.17.5) which will allow me to have the generated SQL same as in 3.14.6? Is there any documentation link which

NoSuchBeanException: expected at least 1 bean which qualifies as autowire candidate. But only on one class during MockBean?

There’s this weird problem. I’m currently testing two repository classes that I plan to use as MockBean. The snippets of the code are as follows: For ClassARepoHibernate For ClassBRepoHibernate Now then, on the testing class, I put this up: When I run this test, it gives out this error before even going to the breakpoint if I debug: This confuses

How to use groupingby() to create a map from a stream in java, but grouping by not only by an attribute

I have a stream from elements of a class x. One of the arributes (t) of the class x is from type LocalDateTime and I need to group the elements by hours. I tried something like this: But this syntax doesn´t work, any other idea of what i might be able to do? Answer The attempt is actually pretty close.

Java aggregate same objects into one

I’m quite new into programming and got a tricky question. I got an object which has multiple parameters: Every object always has non-null number attribute as well as one of three values-field. So for example, if valueOne is not null, the other two value fields valueTwo and valueThree would be null. So here’s my problem: The SampleObject is referenced in

Need help on printing an Array of ArrayLists (of different sizes)

I’m making my own solitaire program I can run on my computer (for leisure and practice) and I am trying to display my ‘ArrayList<Card>[] playspace’ like it shows in Solitaire. More specifically I’m trying to display the card order downward instead of to the right side like it currently is. Following is my entire program (necessary classes needed to run).

Why does the Recycleview work differently when I start it or when I go back to it from an other activity?

I try to create a Shopping/ToDoList application where the items are contained in SharedPreferences. When I start the application, and I choose what I want to execute, Shopping list part or ToDoList part, then the java code fetches the existing data from the SharedPreferences and give to the RecycleView to create and show a list. It seems works totally correct,

Amazon.in site language setting radio button handling in selenium

I am new to selenium automation and while learning radio button handling in selenium, I tried to automate language setting in amazon.in page. I am unable to select the radio button listed in the page. site: https://www.amazon.in/customer-preferences/edit?ie=UTF8&preferencesReturnUrl=%2F&ref_=topnav_lang code used: driver.findElement(By.xpath(“//input[@value = ‘ta_IN’]”)).click(); (I tried to select the language tamil- TA (3rd radio button)). Can anyone guide me in this? Answer

Can I add an image knowing its URI from the phone to the r.drawable folder in Android Studio to use it in a ListView?

I have got the URI of an image from an Input Image Activity. I have passed this URI to the Main Activity using .putExtra. Now I have the URI of the image in the Main Activity and I want to save the image somehow in r.drawable folder or to convert it to a picture which I can save to r.drawable.

Method chaining between child and parent classes

So imagine we have the following. I’m trying to do this, What are the possible ways to achieve this? And what’s the best one (convention)? Answer I’ve seen at least two approaches. Make Animal generic, and use the generic type as return type: Override the method like Alex R said in his comment. I prefer option 2, because a) it