I’ve recently been introduced to the concept of a dependency version lock file when reading about package managers like NPM, Yarn, Paket, Cargo, etc. My understanding is that it is a file that lists all direct and transitive dependencies along with their exact version number so subsequent builds are guaranteed to use an equivalent set of dependencies. This seems to
Tag: java
Where do we use BitSet and why do we use it in java?
I just found out that there is BitSet in java. There are already arrays and similar data structures. Where can BitSet be used? Answer As the above answer only explains what a BitSet is, I am providing here an answer of how I use BitSet and why. At first, I did not knew that the BitSet construct exists. I have
Click button to pass data from edittext to textview in the same page
I want to create a simple program by put data in edit text to display in text view in the same activity.it is look like below image. How can I do this? Thanks. Answer Hope it helps
Provider not found exception when creating a FileSystem for my zip?
I have created a Zip file on a JimFS FileSystem instance. I would now like to read the Zip using the Java FileSystem API. Here is how I create the FileSystem: However, this throws an error: java.nio.file.ProviderNotFoundException: Provider not found Interestingly, the code works with the default FileSystem. What does this error mean? How should I create my Zip FileSystem?
Space Complexity of an array?
I have an array of size N, and N is <=200. What would be the space complexity here. O(1) or (N) – considering the constraint N. Answer Complexity is only relevant when you try to foresee the performances of your algorithm with various input. I don’t think it has any meaning to just speak about the space-complexity of an array
Hadoop Error starting ResourceManager and NodeManager
I’m trying to setup Hadoop3-alpha3 with a Single Node Cluster (Psuedo-distributed) and using the apache guide to do so. I’ve tried running the example MapReduce job but every time the connection is refused. After running sbin/start-all.sh I’ve been seeing these exceptions in the ResourceManager log (and similarly in the NodeManager log): And then later in the file: For reference my
CORS interfering with Spring Security oauth2
I’m having problems trying to get a token from oauth/token from the browser. I have a Spring Boot application with Spring Security and Spring Security oauth, and I’m trying to authenticate from a javascript SPA in a different port. When CORS is disabled in the backend, I can get tokens from the oauth endpoints no problem, using either Postman or
Will using a parallel stream on a single-core processor be slower than using a sequential stream?
I am applying an operation to every element in a very large LinkedList<LinkedList<Double>>: On my computer (quad-core), parallel streams seem to be faster than using sequential streams: However, not every computer is going to be multi-core. My question is, will using parallel streams on a single-processor computer be noticeably slower than using sequential streams? Answer This is highly implementation specific,
Spring boot: how to match all routes?
I’m developing a simple web application on Spring boot 1.5.3 and I need all the routes to send static index.html file. Now, I have this: My application contains only static assets and REST API. But the problem is that the controller shown above only matches the first-level url like /index, /department etc. I want to match all url levels like
Prime number in java 8
I was trying to write a simple prime number program in Java 8. Below is the program. I wanted to reduce the code in isPrime() as well. Is there something that filters the elements from 2 to n/2, and then apply filter for n%i == 0 which would make isPrime irrelevant? Answer IntStream can be used to generate integer stream