I understand that this question has been asked many times in Stack Overflow and I have researched many of them, so please check this. My pom file: Both my maven.compiler.target and maven.compiler.source are set to 1.8 and i have java 1.8 running in my mac (M1). I am not sure why I am still getting the issue. …
Tag: java-8
Java (latest version) Lambda: replace anonymous inner class by lambda
I have got a class which contains the following: VScode Insider tells me to replace the inner class with lambda, Here is a screenshot if you want to see what I mean, ChangeListener is underline as yellow So I tried to think of ways and couldn’t come up with any since I am not experienced enough, any one…
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…
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 …
Standalone Nashorn with Java 11 throws java.lang.StackOverflowError upon eval
I came across an issue with Nashorn, when evaluating a large expression, it works fine in Java 8 , but throws a java.lang.StackOverflowError in Java 11. I came across this question, and in an attempt to fix this issue, as suggested in this comment, I’m trying to use the Standalone Nashorn with Java 11, …
How to iterate over a Map to obtain a String of repeated Character Keys with Java 8
I have a Map shown below: I need to obtain the output: I can do it in normal process, but I want to do it in Java 8. Can you share some hints how to achieve this? Answer Here’s a couple of ideas on how to approach this problem using Java 8 streams. The overall idea: create a stream of
mapper does not convert between dto to entity
I am new to mapsturct I just want to map between dto to entity those two; my bank class; my bank dto class; my mapper below; Answer Target and source properties don’t work well with collections mapping. You need additional mapping for single element. Update your mapper as below, so Mapstruct can use ele…
Runnable interface instantiation
I am following the book Head first java and was reading about threads and came to know about the Runnable interface. Now we know an interface can’t be instantiated directly. Its members are implemented by any class that implements the interface , but below code made bouncers over my head. The book decla…
Convert date format in springboot using java8
I receive the following date format How can I convert it into the following format in java 8 Answer You can use Java 8’s date/time API, and more precisely the DateTimeFormatter. There’s no pre-defined formatter that matches your initial input. The closest is DateTimeFormatter.RFC_1123_DATE_TIME, b…