I have a parent class Tile and inherited classes Walltile, FloorTile, EntityTile. Each inherited class have BufferedImage attributes that is related with its name. I instantiate Tile and then i cast to the specific class, like: But i need to know if this Tile object is WallTile, FloorTile or EntityTile. For t…
Tag: object
Flink ElasticsearchSinkFunction not serializable in non-static method, but serializable in static method
I have a piece of code that only works inside static methods. If I put the code in a static method, then call it from a non-static method, it works. Never heard of anything like this and couldn’t find information online on it. This works: This doesn’t work: (Full) stack trace: The implementation o…
Is it possible to have values for class object in java, if yes how can we acquire it?
Let’s say, I am initializing a class obj as follows: Is it possible to initialize as such I mean we initialize String and primitive values like that, But I mean for any class. And how can we get them so they can be used in some method of the same class? Answer Yes if it is for built in types
How to create Array of Objects using the Jackson Streaming API
I am trying to create a JSON using the Jackson Streaming API. I know how to create an array of elements in JSON using Jackson as we have plenty of examples related to it. But I am a bit confused about how to create an array of Objects using it. Following is the JSON structure that I would like to
How do I work with objects in lists and can I create multiple objects with different names in a loop?
I need to create Objects of a class called “Tile”. I have 9×9 chess board like grid and want to initiate the whole board at once. The position of a Tile is defined by an x and y-axis and I need to work with those later. I thought about doing it with a loop but I want each object to
Why this code convert value to double instead to float?
I got a question. Why this code prints YYZ10.0 instead of printing XXZ10.0? The first constructor is A(int), then inside statement it returns false, so 9+1f should jump into A(float) constructor but instead it is going to A(double). Answer If there are multiple overloads of a method, Java picks which one to c…
Java Problem: Calculations in one subclass’ constructor affecting fields of another subclass’ instance
I have two abstract classes i.e. Medicine and Prescription. All code can be found at https://codeshare.io/aVAdr3 These two classes have subclasses, the class hierarchy diagram is as follows: and… …
Compare elements of two arrays of Object
I am trying to build a generic merge method, part of a mergeSort algorithm but I am stuck on how to deal with the comparison. This is my code so far: public static Object[] merge(Object[] left, Object[…
Adding a newly created object into an array in swift
I decided to start a project in java to get a rough outline of how the program was to function before I started to program it in swift(a language I am completely unfamiliar with) whilst trying to convert the code I’ve ran into an issue and cannot even understand how I’ve gone wrong. This is contex…
Does it matter if function returns T or object if T can not be inferred from context?
I found the following source code in gson: public T fromJson(Reader json, Type typeOfT) throws JsonIOException, JsonSyntaxException { JsonReader jsonReader = newJsonReader(json); T …