I have a question that sorts data from a car report of txt file. The question is: How do I listed cars sorted by their MAKE (Ford, Chevy ..etc). They only need the MAKE to be sorted so they can be all FORD cars under each other, then Chevy, DODGE .. so on and so forth like this: And this
Tag: sorting
Sorting multiple conditions with null value
I have this code, which sorts an array list based on 3 variables But the last variable, getValidFrom can be null since it is OffsetDateTime. If it is null, it throws a NullPointerException. Is there a way to handle null values sorting this way? Or I have to create my own comparing method? Answer Use the nulls…
How do I write a Drake sort algorithm for sorting an array in Java? [closed]
I’m writing a Drake Sort Algorithm in java that will sort a collection of elements. The algorithm is supposed to work like this: An array for example: { -2, 4, 1, 4 } Get the max value of the array …
How to custom sort only specific results in Spring MongoDB?
Is it possible to sort only results that matches a condition in Spring Mongo? Let us say I have this data: Color Fruit Amount Orange Orange 23 Red Apple 4 Red Strawberry 66 Yellow Banana 2 I want to sort the list to display the Fruits with color red on Top and the remaining fruits will be sorted by amount.
How to create a type specific Comparator for a flexible type array?
I am stuck in the middle of ‘generic-type-qualifier-land’ and can’t find the right combination of type qualifiers. I have a class that represents a flexible array that can have a number of different types in it. The class holds an ArrayList<Object> as the container for the elements. Th…
Compare elements of two arrays of Object
I am trying to build a generic merge method, part of a mergeSort algorithm but I am stuck on how to deal with the comparison. This is my code so far: public static Object[] merge(Object[] left, Object[…
How do I efficiently count elements less than a certain value in a sorted array?
Say for example I have a sorted array: And a key value 80 How do I efficiently count all values from 80 below without iterating through the whole array with an if condition? I was thinking Binary Search but then again i’m not searching for any key, I just need the fastest way return the count of values …
Sort List of Strings arrays in Java
I’m trying to make a program that consists of an array of Strings . now I need to sort them in order ‘PJ’, ‘GHS’, ‘FJ’, ‘PAS’ and date. input : output: //Always ‘PJ’, ‘GHS’, ‘FJ’ then ‘PAS’ Answer You should …
Sorting an array of classes based only on field name
I have an application where a user provides me with the name of a field, e.g name or costInCents, and I have to sort by that field. I have ways of guaranteeing that the field name will be correct. This application causes the complication that I simply cannot make my class Comparable and implement a specific c…
Create an algorithm that arranges them in order to form the largest possible integer
I am struggling with this coding problem in Java. It has to be solved using an algorithm. It is supposed to give me the largest possible inter that can be formed with the numbers in the array: {10, 7, 76, 415}. I tried to solve it using selection sort. So far I have is this code below but it’s giving