I am having a list that looks like below What i would like to achieve is to filter like for example on date 2022-08-27 and also on date 2022-08-26 respectively i only return one record which is having the maximum currentSpeed such that my final list looks like below Below is how my code looks like and the way…
Tag: java-stream
Java – Stream API: applying reduce() operation to find the Minimum value that meets the requirements
Small question regarding Java and its Stream API, especially the reduce() operation. I have as input some Stream of integers. The integers go from -1 inclusive, to a positive integer. In the mathematical notation, it would be [-1,n]. Note that the smallest possible number is -1 (minus 1). It cannot be -2, -3,…
Java Stream Collect() classifier can’t detect type
I have the following code reading lines from a text file: The text file has data like And I’m trying to group by String1 and String2 and get their counts. Then end result should be a Map<String, Map<String, Long>>. However, with the code above, the compiler is saying that the collect() retur…
Search for all po files in a directory and its subdirectories and create a Hashmap containing the filepaths as value and its directory as key
I want to search for all .po files in a directory and add them to a HashMap. My directories looks like the following: How can I represent/search these files with the help of java-Streams and HashMap<String, List<File>>, with en/de/it.po as a List<File> type and the respective directory root …
How to convert following Java code to Java 8
I am trying to convert the following Java code to Java 8. I have written the following code to calculate the average temperatures. The above code is working fine. Now, I am trying to convert it to Java 8. I have written the following code, but I am getting compile-time errors I thought map is better suited he…
How to improve the Java Stream method?
I would like to improve the following Java Stream method and to understand better how does anyMatch in Stream work. In my example the get(blogContext.getBlogContextEnum().getTagName(), new String[0]) can have one or many tags. Will the anymatch iterate through each value that comes from the previous get? When…
Sort String of Characters Using Hashed Array and Java 8 Streams
I stumble upon this cool sorting algorithm with O(n) time complexity on GeeksforGeeks – Sort string of characters and I was trying to refactor the code to use Java Streams on the nested for loops instead and collect the result in a string variable but I can’t seem to wrap my head around it. Here&#…
Stream non terminal operation + filter + findFirst
I’m trying to understand how the non-terminal streams operations are invoked. This seems clear for me. The first stream is not ended with terminal operation, so it doesn’t invoke the non-terminal operation and nothing is printed. The second one has terminal operation, so all the elements are print…
Java streams average
I need to create two methods using streams. A method that returns an average score of each task. and a method that returns a task with the highest average score. I can only modify those 2 methods. Here is CourseResult class And methods that create CourseResult objects. Based on these methods I can calculate a…
Implement conditional reduction of two lists into a single list containing two elements using Stream API
I’m comparing two lists based on the following conditions: If list1 has higher value, +1 to the first element in the result. If list2 has higher value, +1 to the second element in the result. If values are the same, skip it. I have implemented this solution in Java 7 How could I do the same with Java 8 …