I have a basic program where stock images form the background for a larger program – but a number of the images have slightly different sizes compared to each other. My initial code loads up the background image and tries to set the canvas size based on the image dimensions: I get ‘IllegalStateException’ error bg.width and bg.height are 806 and
Tag: java
Mongo DB Aggregation with Count for Specific Conditions and filter by Date Range which Outputs a Projection Doesn’t work as Expected
Please consider that I’m a beginner to MongoDB and I need to retrieve data from MongoDB database in somewhat complex query format. I’ve referred several Questions and Answers published in the community but my expected query was much complex due to some complex counts operations for certain conditions etc. However I was able manage to retrieve the data to a
Is there an O(n) way to find all indices of a value in an array? [closed]
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 6 months ago. Improve this question Requirement find all indices in new int[]{2, 1, 3, 1, 4, 2, 1, 3} The time complexity is within O(n)
Spring Rest Template always return 500
i use Rest Template to consume a rest web service, However i always get 500 although when I test with postman i get 200 Here is Rest template code : Postman response : RestTemplate Error : Answer Try passing the array in one parameter rsargs[] and not in two as you do.
How to initialize an empty Mono Class object in reactive programming?
I am learning reactive and I wanted to know how to initialize a Mono object, like in Java when:User usr=new User(). How to create a Mono object of this similar class? Answer There are different ways you can create an object. Checkout this link for better understanding https://projectreactor.io/docs/core/release/api/reactor/core/publisher/Mono.html Here you can just use the Mono.just(new User());
Multiple application on single PC
I have installed Tomcat server on my server PC with IP 127.0.0.1 One application is running on the server. Let address of the application is: 127.0.0.1:8080/first-project Now if I want to run another application on the same server, address will be: 127.0.0.1:8080/second-project I want multiple application with multiple addresses like 127.0.0.1, 127.0.0.2 a) Is this possible to have multiple address
abstractor method with object return type in java
I’m new at oop ,I want to pass object parameter of an abstract method but it gives me error, can anyone explain it to me and help me fix the error . Thanks for your help. Answer You cannot change the abstract method signature. You have created an entirely new method unrelated to the method you wanted to override. Use
List<? super List> and List<? extends List> and how to use it correctly?
Consider the following snippet: Here I am trying to understand how to interpret these two statements Expression:1 Here we say that the List on the RHS must be such that all the elements of the list will satisfy the condition ? super List<? super Integer> but doubleList / integerList / numberList are not satisfying this condition anyhow – as we
What’s the meaning of this line of code? And how can I create an object of this class?
I was trying to construct an object of the MTree class (https://github.com/Waikato/moa/blob/master/moa/src/main/java/moa/clusterers/outliers/utils/mtree/MTree.java) The constructor of MTree looks like this: The DistanceFunction here is an interface, the code of it is: And it’s implementation is: And my first question is what’s the meaning of return new DistanceFunction<Data>() in the method public static <Data> DistanceFunction<Data> cached(final DistanceFunction<Data> distanceFunction) [the method is in
Can We Have Multiple Spring Configuration Files in One Project?
Can We Have Multiple Spring Configuration Files in One Project? If yes, can someone provide a working example to support this concept? Answer Yes, in large projects, having multiple Spring configurations increase maintainability and modularity. You can load multiple files like this:- You can also upload one XML file that will contain all configs. inside the XML file:-