I'm deserializing JSON payloads using Jackson. I have some fields that can be either Objects or Arrays of Objects. So In my Java code I'm declaring ...

I'm basically trying to write a function like this: Where if it is the instance, it returns the value as that type, and otherwise returns false. H ...

Code example is below. I have a Record that implements an Interface. When I check if an object of type Record is an instanceof the Interface, the res ...

I got two interface-classes (actually three) in a maven project called "interface": I got a bean in a maven project called "server" (that got depen ...

I am working in Java 19, and using the pattern matching for instanceof that was released in JEP 394 (which released in Java 16). However, I am running ...

I have Java 19, and I am attempting to do some simple pattern-matching on a record that I created. However, Java is giving me a very confusing compila ...

I have a spring boot project with Java 17. I am calling a third party API to get the list of records. If the records are present I do get the 200 OK r ...

I have the following code: However if I replace the first condition with if (!(event.target instanceof HTMLElement) the error is gone. Why does it ...

In Java 19, I'm trying to use instanceof pattern matching inside an assert statement. I would expect the matched type would be available after the sta ...

I am going through Oracle's official docs to understand Pattern Variable scope in Java 17. In the following example, the method testScope1 works as ex ...

I've come across PHP code with the a check which tests if a POST value is an instanceof a class: This seems odd to me, because I wouldn't think tha ...

apologies if this is simple or has been answered before, I'm new to Java and in my research I can't find too much on this issue and have not yet found ...

I have problem with instanceof in java. For clarification, I use aws-neptune-jdbc drive for connection to janusgraph server. I create GraphSONMessage ...

Is instanceof able to check also the enclosing class (not sure if that is the right wording for my problem)? Please see below. Car.java x.java ...

I have created a custom error class which extends the built-in Error class and adds a new value to it. The error itself works as expected. I want to ...

I am trying to make a function that sifts through an array of objects that inherit from one abstract class. The function takes in the item to look for ...

I have the following method that can return different types of Storable (ex: Food, Ore). Inventory.java It works, however I'm forced to cast my re ...

I would like to create a Java stream that will collect only elements that are instanceof class A and at the same time are distinct by x. I am using J ...

I have a class structure: Now, I also have a function in which I want to pass AddResourceCard or AddGoldCard and in someones Inventory I want to ch ...

Sometimes I would want to throw an exception with more information to the user, so they can easily see why the method failed. My method would look li ...