I need an algorithmic help to convert an input array in Java having this content : {5,6,3,2,4,7} To this format : [[2, 3], [3, 4], [4, 5], [5, 6], [6, 7]].
Tag: sorting
Sort A List of an Object with other object’s method
In the bellow code, with such classes, how can I sort an ArrayList of Students by the score the got from Courses List? I mean how can I sort a List of a specific class by an attribute of this class which is a child of another class. Answer Your “Student” class is confusing. Based on the name, it sounds
Sort arrays using lambda
I want revers-sort java8. I don’t want use stream. Here is an example: I want it like this: {5, 4, 3, 2, 1}; So my code is this But I get an error message: Operator ‘-‘ cannot be applied to ‘T’, ‘T’ How can I reverse sort and sort? Is there a better way? Answer You can try if you
Best way to sort customerAddress in such a way that all primary address are at the top and others at the bottom
I am trying to sort the below list in such a way that primary address is at the top of the list followed by other address (p.getIsPrimary is a Boolean value and can be null). Is there any other way …
Java sort string array using Array.sort() like python’s sorted with key=lambda x:
I’m occasionally learning Java. As a person from python background, I’d like to know whether there exists something like sorted(iterable, key=function) of python in java. For exmaple, in python I can …
How to sort two arrays with one being sorted based on the sorting of the other?
So I have encountered this problem a lot of times. Let me explain. Say I have these two arrays: A1={1,2,3,4,5,6,7,8,9,10}; and A2={1,2,3,0,2,1,1,0,0,0};. What I require is this: When I sort A2, whatever swapping and shifting of elements takes place in A2, the same should take place in A1 as well. Basically I am trying to create a Map using two
Java: Order a list of Objects based on Calendar date?
I have a list of Java Objects that all contain the following field: I want to order the list of objects based on the above field , the object with date field most recent first. What is the best way to do so? Answer You can use Comparator.comparing, suppose you have List<Entity> then you can do this way
Array out of bound exception while doing topological sort
This code takes the no. of nodes in a graph and creates the graph with the number of nodes and then the user has to input the one-way edges between two vertices.(The formed Graph is a Directed Acyclic Graph or DAG). The graph is then sorted by the topological sorting function topoSort The problem is in the topoSortRE method which
Sorting based on order mentioned in a static map using java
How to sort a list of strings based on order mentioned in static map having item of list as key. List={“AU”,”I”,”U”, “O”, “A1”} Need to sort the above list of string using the below map which has …
What is the name of this sorting method, how does it work and how does it compare to Arrays.sort()?
Q#1 I am searching for a method to sort an array in ascending order. I found this and it works, but I don’t understand how it works. Q#2 As for the Big O notation, which method is better (n will be small in my case), the method below or Arrays.sort()? Note: array is equal to arr.length. Answer #1 The method