I would like to convert a list to a self-implemented linked list using reduce. I managed to do that in a reverse order: Output is I think to obtain result in the correct order, I may have to use something like foldRight or reduceRight in other languages. Does java provide anything similar, given that the stream is guaranteed to be
get all column records in excel instead of getting only last column record using apache poi
i am trying to get all column records in excel using apache poi. But i am getting only last column data in excel. Below is my code. In below code i am trying to create new row when it reaches specific number of columns. and in each row it as to put all column data. above code is giving only
Run same Junit Test with multiple objects derived from same interface
I am trying to improve my knowledge about testing I’m trying to achieve running the same JUnit test class with different objects derived from the same interface. so we can assume the following: So my question is how to run the test class with the objects from A,B,C without falling into the trap of duplicate code and redundancy? Please note
Map and groupBy values in a stream
I have a wrapper that may or may not contain data: I group one user to multiple contacts: It groups val mailsByUser: Map<String, List<EmailAdapter>> I want to group all emails to a unique user I want to unwrap the EmailAdapter so that the relation is EmailAdapter.user -> List<EmailAdapter.mail> or val mailsByUser: Map<String, List<Email>> I fail in the last step –
How to scan for annotations in methods only in specific classes using reflection library java?
I have an annotation @API which I assign to all the routes i.e RequestMapping in a controller in java spring.What I want to do is,First scan all the classes in a package that are annotated with @Controller and after scanning all the controller classes,I want only to scan for Methods with annotation @API in only these controller annotated classes. How
Java cucumber Selenium : NullPointerException for scenario.write for the first scenario on before tag
I am getting the NullPointerException when the code below code is executed. Note that the exception is recieved only for the first cucumber scenario executed. There is no exception for the second scenario. I am actually trying to insert the timestamp before start of each scenario. Please advise how this issue can be fixed. Any help will be appreciated. I
How to create a non-executable JAR file that includes all Maven dependencies
I have a Java project that doesn’t have a main file but it has a lot of Maven dependencies. How I can create a JAR-file that contains my source-code and required maven dependencies? My pom.xml: Answer You can use the maven-assembly-plugin just as you could use it for creating an executable JAR with dependencies. The only thing you need to
How to make multiple buttons work individually in Swing?
I am trying to develop an application and I have decided to learn Swing to create the GUI. I have never learnt this before, it seems quite simple but I haven’t gotten my head around ActionListener. I am trying to make the buttons respond by producing some debug text in the console. Could someone take a look and point out
Is there a way to split input into 4 int and pass onto a method (int a, int b, int c, int d) in java?
I have this problem. Suppose I want to take user input starting from the first line of input as integer that will determine the number of inputs, and the inputs must be a numbers of 4 categories (day , hr, min, sec). As an example of input Input: Enter integer: 3 4 5 6 3555 6 11 3 120 1
Create different request objects dynamically
Is it possible to create different objects dynamically from a superset object. For example: SuperSet Object: class Z { // some attributes } class A { String a, m, f, c; int x,y,z; Z …