I have a list student list A and I have student list B. Student objects contains some fields like that : no,age,city,birth_date,salary My list A contains these objects My list B contains these objects What i want to do is extract student objects that ListA have but listB not and ListA and ListB have(as no,age…
Tag: java-stream
Using Streams and StreamSupplier: forEach closes StreamSupplier instead of instance of stream
I am making a obj file loader for an engine that I’m writing and I am trying to use Streams to load vertex index, uvcoord, and normals from this file. The way I intended to do this was to create a new stream from a stream supplier for each type I want to load. Right now I am just trying
Are stream elements sorted? [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 1 year ago. Improve this question Is there a way to find if the elements taken from a Stream in encounter order, are all sorted…
How to Iterate list of list of Java Objects using Java 8
How to iterate and get through list of list of objects using Java 8 Also need to get the count of distinct customerIds CustomerEditVO and CustomerIssues are POJOs Post Request body —> Answer I have created all the given POJO’s and created the objects and list for your query.And also overrides t…
java streams java.util.stream.ReferencePipeline$3@7291c18f
I have three layers and I want to reach students names using streams from Project. I can reach them from Group. How could I do that from Project. From Group it works fine. But when I want do it from Project and run something like this: I get this: java.util.stream.ReferencePipeline$3@7291c18f Answer If I corr…
Java streams collect excel CSV to a list filtering based on the sum of a column
Suppose we have an excel spreadsheet that looks like: How can I be able to gather to a list of only the IDs of the people whose status count is a sum greater than 0, and if it is 0 or less then discard it. So in the excel spreadsheet above, the list in java should look like: List<Integer> =
‘OptionalDouble.getAsDouble()’ without ‘isPresent()’ check
I’ve seen a bunch of solutions for this question but no matter what I try, IDEA still reports an error. Consider the following block: This reports a warning of ‘OptionalDouble.getAsDouble()’ without ‘isPresent()’ check. If I try this then it doesn’t compile: Neither does th…
Combine similar elements in a Java Stream
How to combine consecutive similar objects that are in a Java Stream? Till now I could not find a good solution, so I hope you can help. Suppose we have a class like the following: class Someclass { …
How to map a stream of class objects into a stream of properties of said class?
I have a class that has 3 properties, all with the same data type, let’s say: Then, I have a stream containing test classes (assume all the properties are notnull random integers): How can I convert (or map?) that stream to a stream, made up by integers of the class. Printing now the stream would look l…
How to compare two maps with different values using the Stream API? [closed]
Closed. This question needs debugging details. It is not currently accepting answers. Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question. Closed 2 years ago. Improve this question There…