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 i
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, etc., the smallest is -1. I would
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() returns a ConcurrentMap <Object, ConcurrentMap<Object, Long>>. Why are the
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 of these files dir1subdir-1**subdir-n as a key? I’ve tried the following solution
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 here, but after
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 showAllTopics && currentFilterTag.equals(“xxx:content/something”) evaluates to true it should check that blogTags contain the
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’s the original code: Answer Try
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 printed. This is where I’m getting confused, especially with the last one. Looks
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 an average of each task by
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 streams?