I may be not able to search properly but this is a query in theory is simple. I have list of arrays containing numbers. I want to filter list which match all entries from another list. Say following …
Tag: java-stream
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 …
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 l…
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 woul…
Create a stream that is based on a custom generator/iterator method
How can I create a Stream that creates a number of items based on a custom generate() method? The question is different from the one referred to. The final result is a Stream, so I could (simplistically) use a “.forach( System.out::println)”. An example would be: Stream.generate( myGenerateMethod)…
How to collect a map of a pojo id to a set of a property of a collection on the pojo
I’m trying to use streams to get a map of a pojo to a Set of items exposed by a property on the pojo. I realise that isn’t clear so I’ll show how I’ve done it without streams. I have and enum of …
How do you call a method from within a Collector in Java 8 Streaming?
I have a bit of code that is working functionally as I want it to: private Map localMethod(List branchList) { Map
How to search for a string in a pdf document [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations. Closed 2 years ago. Improve this ques…