In this blog it has been written that Apache Camel will drop the Java 8 support in the mid 3.x versions: Java 8 will still be supported for the first number of 3.x releases but is expected to be dropped later in 2020 How can I know precisely from with version the Java 8 support has been dropped? If I’m
Tag: java-8
Assign unique value to field in duplicate records group during groupingBy
According to the reply provided by devReddit here, I did grouping of CSV records (same client names) of following test file (fake data): CSV test file Client Entity Program Final Result (Grouped by Center) What I Need I need to assign a unique value to each group of repeated records, starting over each time center value changes, even keeping the
Map.ofEntries gives Null Pointer Exception on checking NULL key using containsKey()
I was fetching key from a constant map earlier using HashMap. On passing a NULL key at containsKey(), I used to get FALSE. To make the code look fancy, I tried java-8 over it. So, instead of HashMap, I started using Map.ofEntries to build my map Surprisingly, I got Null Pointer Exception when a Null key was passed to containsKey()
How to use stream to filter objects from HashSet that have empty value for certain fields?
I am looking for a way to filter only the Worker objects with a specific first name and empty lastName from the given HashSet. For example I want the code to return the record with firstName == scott and lastName == “”. Answer filter is a non-terminal operation and the stream would be processed only when a terminal operation is
Divide a list into fixed number of list in java
I am trying to figure out an efficient way to divide a list into a fixed number of list Example 1 Input – [1,2,3,4,5,6,7,8] Number of lists – 4 Output- [1,2], [3,4], [5,6],[7,8] Example 2 Input – [1,2,3,4,5,6,7,8,9,10] Number of lists – 4 Output- [1,2,3], [4,5,6], [7,8],[9,10] Not necessarily the order of elements should be fixed I tried few examples
Get the last element of each entry in a LinkedHashMap?
I have a map and I want to extract the last value for each key from that map, but I can’t get it: Extract: i.e. the last NUM entries for each key Answer You can use reduce to extract the last value from Map<String,String> and then collect them using toMap into LinkedHashMap to save the insertion order But as a
Java8 Streams: How to preserve the value before map to be accessed by collect/groupingBy functions
I’m using Java8 Streams to iterate through a list and for each of the element I invoke map and then I need to aggregate the results. My problem is that when I call groupingBy I also need to access the original object before calling map. Here is a snippet: The problem is with the call to Collectors.summarizingLong(item.getCount()) since item at
Java – ZonedDateTime does not correctly convert to Date object?
I have the following Java code: The Issue I am having is that convertedDateis not correct in comparison to the zonedDateTime object. For Example when I have a zonedDateTime object of: with zone: The code above converts this to: What I would be expecting here is As the Africa/Abidjan timezone is 2 hours ahead of BST. How can I solve
How to print List of String array array using lambda in Java [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 1 year ago. Improve this question This is my code: How to print the List that contains String array
HashMap: Is there a way to search by hashcode and not by key?
I may sound completely wrong but: I’ve read as many posts as I could find here about HashMap and hashcode . I did not get what I was looking for exactly. I am going to try to be as precise as I can. Let’s say I have a huge hashmap where : keys are of type my_struct and values as