I am trying to securely generate random numbers. It must support NIST standards, that is NIST SP 800-90A, SP 800-90B, SP 800-90C. I’ve read that Java 9 has an implementation of SecureRandom supporting such standards. My question is: is there an implementation supporting these standards in Java 8 (I am using Android)? Ideally I would like it to be built-in
Tag: java-8
java: Optimizing if statement in Java using Optional [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 2 years ago. Improve this question I have the following code in Java which I need to optimize by the usage of Optional in Java 8: Can someone suggest a Java
How to combine two lists from the same relation in Java-8
I have below entities Manager and Colleague Manager Entity Colleague Entity Above relation can be represented in JSON as I am retrieving the result on managerReposiotry.findAll() as I want to create a super list of all names from Manager and Colleague What I am currently doing is Is there any other way in Java-8 to improve the above code? Thank
Java 8 lambda expression or old way
Hello guys I’ve got question about Java 8 lambda expression. For example I want to delete following id from class. UserEntity userEntity = userEntityOptional.get(); for(Long permission_id : …
Combine list of list into map using stream
I’m trying to convert a pojo object that looks like into Map<String, List<String>>, such as: how can I accomplish this using stream? I preferably want to utilize stream into collect(), instead of using forEach() (which is basically a for-loop). Thanks in advance. EDIT: The pojo class looks something like: And I basically have List<Pojo> Answer You can do it using
Invokedynamic with non-static context
I learnt that invokedynamic instruction of bytecode calls a static method representation of lambda. Please let me know if that is incorrect. if correct, then how is below code working? Answer It’s not correct to say that lambda expressions were always compiled to a static method. It’s not specified, how they are compiled, which leaves room for two different strategies
Java 8 Streams Remove Duplicate Letter
I’m trying to apply my knowledge of streams to some leetcode algorithm questions. Here is a general summary of the question: Given a string which contains only lowercase letters, remove duplicate letters so that every letter appears once and only once. You must make sure your result is the smallest in lexicographical order among all possible results. Example: Another example:
How to filter and log null objects in Java 8 streams
I am trying to wrap my head around java8 streams and was wondering if someone can help me with it. In old java, Basically, I want to filter null objects and also log it. What’s a good way to do this in java 8? Answer You can use peek and put an if statement inside it: But this kind of
Appending a string when find duplicate using stream
I do have a use case where i need to append a string(name) with version (name_version) which i will have in a model layer. But this is to be done only for the name which are duplicate in the list. …
Collect a stream after an objects attribute exceeds a certain threshold
Assume I have a list of custom objects MaDate with a field temp of type int. I want to use streams to get all items after the first hits a certain threshold MaDate.temp >= 10 . And Ideally the result list should contain the last 3 elements having temp values [10,3,9]. I can not use filter because this would eliminate