Watch this space
I though I might as well learn some Streams, so let't try something.
38 lines and doesn't it do a lot
I changed it slightly from my version because I have a keyboard input class and you haven't, but it should work unchanged with a Scanner.
The constructor creates a List and populates it; I copied and pasted your error messages as a single block to the terminal and then terminated input with ctrl‑D. If you use Windows® and ctrl‑D doesn't seem to work, try ctrl‑Z instead.
It adds all the lines to that first List.
Line 28: Then I got a Stream and filtered it to keep only those lines beginning with the name of the Exception. You notice that the Stream being created from a List<String> already is a Stream<String> so the function to startsWith works as long as the String has a startsWith method.Line 29: Then I use the distinct method which uses the equals method to determine whether you have the same object twice.Line 30: Then I mapped each element to a String with the toString method. That line is redundant and can be removed without altering the functionality.Line 31: Then I mapped the Strings again using a function to get the substring after the last dot.Line 32: Then I used the collect method and the example given under the reduction link in the API page, to collect the remaining contents of the Stream into a new List.Line 35: Create a new Stream from the new List and use its forEach method to apply the ::println method in the reference System.out:: to the element of the Stream.To use my class, copy and paste the entire error message block then feed the end of transmission character to terminate output. When I tried it, this is what I got:-
Line 12 tells you it wants to find an .add method but it should be
long[] add(long[] arr1, long[] arr2) ...
You showed us a
double[] add(long[] arr1, long[] arr2) ...
method. It is slightly odd to add two long arrays and make a double array, and the tests expect a long[]. That is what the three Js mean in ([J[J)[J
If you add two long[] arrays you would expect to get a long[] array as the result.
Check that you are supposed to add two long[] arrays to make a third long[] array. Also check that the name of the class (…Vektor2) is exactly correct and matches the error messages. If that is indeed the case, then you will need to change the return type of that add method. You cannot have two methods in the same class with the same signature and different return types.
