sort list based on another list java sort list based on another list java

As each pair of strings are passed in for comparison, convert them into ints using originalList.indexOf, except that if the index is -1, change the index to originalList.size() Compare the two ints. Using Kolmogorov complexity to measure difficulty of problems? You posted your solution two times. Then the entire class is added to a list where you can sort on the individual properties if required. People will search this post looking to sort lists not dictionaries. Can airtags be tracked from an iMac desktop, with no iPhone? Developed by JavaTpoint. Just encountered the same problem. Connect and share knowledge within a single location that is structured and easy to search. How do I call one constructor from another in Java? rev2023.3.3.43278. Copyright 2011-2021 www.javatpoint.com. Assuming that the larger list contains all values in the smaller list, it can be done. I need to sort the list of factories based on price of their items and also sort list of other items from competitors for each factory. String values require a comparator for sorting. Not the answer you're looking for? An efficient solution is to first create the mapping from the ID in the ids (your desired IDs order) to the index in that list: val orderById = ids.withIndex ().associate { it.value to it.index } And then sort your list of people by the order of their id in this mapping: val sortedPeople = people . @Debacle: Please clarify two things: 1) Is there a 1:1 correspondance between listA and listB? you can leverage that solution directly in your existing df. @RichieV I recommend using Quicksort or an in-place merge sort implementation. That way, I can sort any list in the same order as the source list. See JB Nizet's answer for an example of a custom Comparator that does this. unit tests. Is there a solution to add special characters from software and how to do it, Minimising the environmental effects of my dyson brain, The difference between the phonemes /p/ and /b/ in Japanese. Try this. I am a bit confused with FactoryPriceComparator class. Once you have a list of sorted indices, a simple list comprehension will do the trick: Note that the sorted index list can also be gotten using numpy.argsort(). Application of Binary Tree. Using Comparator. Acidity of alcohols and basicity of amines. We are sorting the names according to firstName, we can also use lastName to sort. We can easily reverse this order as well, simply by chaining the reversed() method after the comparingInt() call: While Comparators produced by methods such as comparing() and comparingInt(), are super-simple to work with and only require a sorting key - sometimes, the automated behavior is not what we're looking for. Make the head as the current node and create another node index for later use. . How is an ETF fee calculated in a trade that ends in less than a year? This work is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License. Streams differ from collections in several ways; most notably in that the streams are not a data structure that stores elements. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. You can do list1.addAll(list2) and then sort list1 which now contains both lists. What is the shortest way of sorting X using values from Y to get the following output? In java 6 or lower, you need to use. Note: Any item not in list1 will be ignored since the algorithm will not know what's the sort order to use. I don't know if it is only me, but doing : Please add some more context to your post. The returned comparable is serializable. Using this method is fairly simple, so let's take a look at a couple of examples: Here, we make a List instance through the asList() method, providing a few integers and stream() them. Sorting HashMap by Value Simple Example. One with the specific order the lists should be in (listB) and the other has the list of items (listA). I fail to see where the problem is. This comparator sorts the list of values alphabetically. The Comparator.comparing static function accepts a sort key Function and returns a Comparator for the type that contains the sort key: To see this in action, we'll use the name field in Employee as the sort key, and pass its method reference as an argument of type Function. Why is this sentence from The Great Gatsby grammatical? This is just an example, but it demonstrates an order that is defined by a list, and not the natural order of the datatype: Now, let's say that listA needs to be sorted according to this ordering. The best answers are voted up and rise to the top, Not the answer you're looking for? As each pair of strings are passed in for comparison, convert them into ints using originalList.indexOf, except that if the index is -1, change the index to originalList.size () Compare the two ints. No new elements. Is there a solution to add special characters from software and how to do it. Other answers didn't bother to import operator and provide more info about this module and its benefits here. good solution! 2023 ITCodar.com. But it should be: The list is ordered regarding the first element of the pairs, and the comprehension extracts the 'second' element of the pairs. I am also wandering if there is a better way to do that. This can be elegantly solved with guava's Ordering.explicit: The last version of Guava thas supports Java 6 is Guava 20.0: First create a map, with sortedItem.name to its first index in the list. Key and Value can be of different types (eg - String, Integer). In addition, the proposed solution won't work for the initial question as the lists X and Y contain different entries. then the question should be 'How to sort a dictionary? 1. Using a For-Each Loop Here is an example of how to sort a list and then make the changes in another list according to the changes exactly made to first array list. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Mail us on [emailprotected], to get more information about given services. Using Kolmogorov complexity to measure difficulty of problems? good solution! test bed for array based list implementation, Reading rows based on column value in POI. The solution below is simple and should fix those issues: Location of index in list2 is tracked using cur_loclist. We can use this by creating a list of Integers and sort these using the Collections.sort(). rev2023.3.3.43278. Java 8 - How to Sort List with Stream.sorted() - Stack Abuse If you're using Java 8, you can even get rid of the above FactoryPriceComparator and use the built-in Comparator.comparingDouble(keyExtractor), which creates a comparator comparing the double values returned by the key extractor. Java Sorting Java Sorting Learn to use Collections.sort () method to sort a list of objects using some examples. It's a List, and Item has a public String getWeekday() method. How To Sort the List in Java 8 - Making Java easy to learn Zip the two lists together, sort it, then take the parts you want: Also, if you don't mind using numpy arrays (or in fact already are dealing with numpy arrays), here is another nice solution: I found it here: Let's say we have the following code: Let's sort them by age, first. Why did Ukraine abstain from the UNHRC vote on China? A example will show this. I see where you are going with it, but you need to rethink what you were going for and edit this answer. 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Why are physically impossible and logically impossible concepts considered separate in terms of probability? Premium CPU-Optimized Droplets are now available. My use case is this: user has a list of items initially (listA). An efficient solution is to first create the mapping from the ID in the ids (your desired IDs order) to the index in that list: And then sort your list of people by the order of their id in this mapping: Note: if a person has an ID that is not present in the ids, they will be placed first in the list. I have two lists List list1 = new ArrayList(), list2 = new ArrayList(); (Not the same size), of the class Person: I want to create a new list using list1 and list2 sorted by age (descending), but I also another condition that is better explained with an example: He should, because his age is equal to Menard, Alec is from L1 and two Person from L1 can't be one after another is this kind of situation happens. This method will also work when both lists are not identical: /** * Sorts list objectsToOrder based on the order of orderedObjects. This will provide a quick and easy lookup. If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? Once streamed, we can run the sorted() method, which sorts these integers naturally. The code below is general purpose for a scenario where listA is a list of Objects since you did not indicate a particular type. Why is "1000000000000000 in range(1000000000000001)" so fast in Python 3? On the other hand, a Comparator is a class that is comparing 2 objects of the same type (it does not compare this with another object). For Action, select Filter the list, in-place. 2013-2023 Stack Abuse. [[name=a, age=age11], [name=a, age=age111], [name=a, age=age1], [name=b, age=age22], [name=b, age=age2], [name=c, age=age33], [name=c, age=age3]]. [Solved] Sorting a list based on another list's values - Java More elegant code or using some built in Java class? Short story taking place on a toroidal planet or moon involving flying. ', not 'How to sorting list based on values from another list?'. You can have an instance of the comparator (let's call it, @BrunoCosta Correct, I assumed it wasn't readonly since the OP called, Sorting a list and another list inside each item, How Intuit democratizes AI development across teams through reusability. How to sort one list and re-sort another list keeping same relation python? A tree's ordering information is irrelevant. Once you have that, define your own comparison function which compares values based on the indexes of list Y. Disconnect between goals and daily tasksIs it me, or the industry? You posted your solution two times. How to match a specific column position till the end of line? rev2023.3.3.43278. that requires an extra copy, but I think to to it in place is a lot less efficient, and all kinds of not clear: Note I didn't test either, maybe got a sign flipped. Then you can create your custom Comparator that uses the Map to create an order: Then you can sort listA using your custom Comparator. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. Maybe you can delete one of them. My question is how to call compare method of factoryPriceComparator to sort factories? My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? Given an array of strings words [] and the sequential order of alphabets, our task is to sort the array according to the order given. The signature of the method is: The class of the objects compared by the comparator. Thanks for contributing an answer to Code Review Stack Exchange! To learn more about comparator, read this tutorial. The Collections (Java Doc) class (part of the Java Collection Framework) provides a list of static methods which we can use when working with collections such as list, set and the like. To get a value from the HashMap, we use the key corresponding to that entry. His title should have been 'How to sort a dictionary?'. If the data is related then the data should be stored together in a simple class. Sign up for Infrastructure as a Newsletter. Now it produces an iterable object. 1. Else, run a loop till the last node (i.e. Sorting list based on another list's order. Linear Algebra - Linear transformation question. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? There are two simple ways to do this - supply a Comparator, and switch the order, which we'll cover in a later section, or simply use Collections.reverseOrder() in the sorted() call: Though, we don't always just sort integers. Linear Algebra - Linear transformation question, Acidity of alcohols and basicity of amines, Is there a solution to add special characters from software and how to do it. How can this new ban on drag possibly be considered constitutional? All rights reserved. Did you try it with the sample lists. There are at least two good idioms for this problem. Sometimes, you might want to switch this up and sort in descending order. However, some may lead to under-performing solutions if not done properly. How can this new ban on drag possibly be considered constitutional? Once, we have sorted the list, we build the HashMap based on this sorted list. http://scienceoss.com/sort-one-list-by-another-list/. Getting key with maximum value in dictionary? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. . @Hatefiend interesting, could you point to a reference on how to achieve that? A stream represents a sequence of elements and supports different kind of operations that lead to the desired result. I used java 8 streams to sort lists and put them in ArrayDeques. You can use this generic comparator to sort list based on the the other list. Working on improving health and education, reducing inequality, and spurring economic growth? Originally posted by David O'Meara: Then when you initialise your Comparator, pass in the list used for ordering. Something like this? Why do academics stay as adjuncts for years rather than move around? Making statements based on opinion; back them up with references or personal experience. Why is this sentence from The Great Gatsby grammatical? Starting with the example input you provided: This is also known as the Schwartzian_transform after R. Schwartz who popularized this pattern in Perl in the 90s: Note that in this case Y and X are sorted and compared lexicographically. That's O(n^2 logn)! How do you ensure that a red herring doesn't violate Chekhov's gun? This is useful when your value is a custom object. HashMap in java provides quick lookups. you can leverage that solution directly in your existing df. Now it produces an iterable object. As for won't work..that's right because he posted the wrong question in the title when he talked about lists. The order of the elements having the same "key" does not matter. How do I make a flat list out of a list of lists? not if you call the sort after merging the list as suggested here. MathJax reference. your map should be collected to a LinkedHashMap in order to preserve the order of listB. The method signature is: Comparable is also an interface belong to a java.lang package. 2023 DigitalOcean, LLC. Does this assume that the lists are of same size? On the Data tab of the Ribbon, in the Sort & Filter group, click Advanced. All rights reserved. 1. @Hatefiend interesting, could you point to a reference on how to achieve that? In this tutorial we will sort the HashMap according to value. Any suggestions? Minimising the environmental effects of my dyson brain. Starting with the example input you provided: This is also known as the Schwartzian_transform after R. Schwartz who popularized this pattern in Perl in the 90s: Note that in this case Y and X are sorted and compared lexicographically. Thanks for learning with the DigitalOcean Community. Examples: Input: words = {"hello", "geeksforgeeks"}, order = "hlabcdefgijkmnopqrstuvwxyz" Output: "hello", "geeksforgeeks" Explanation: Specifically, we're using the comparingInt() method, and supplying the user's age, via the User::getAge method reference. How do I read / convert an InputStream into a String in Java? Using Java 8 Streams Let's start with two entity classes - Employee and Department: The . Here if the data type of Value is String, then we sort the list using a comparator. You should instead use [x for (y,x) in sorted(zip(Y,X), key=lambda pair: pair[0])]. How do I split a list into equally-sized chunks? We can use the following methods to sort the list: Java Stream interface provides two methods for sorting the list: Stream interface provides a sorted() method to sort a list. How can this new ban on drag possibly be considered constitutional? You can create a pandas Series, using the primary list as data and the other list as index, and then just sort by the index: This is helpful when needing to order a smaller list to values in larger. Also easy extendable for similar problems! The second one is easier and faster if you're not using Pandas in your program. The sort method orders the elements in their natural order which is ascending order for the type Integer.. So we pass User::getCreatedOn to sort by the createdOn field. "After the incident", I started to be more careful not to trip over things. This is actually the proper way of doing it: when you sort a Factory, you cannot sort the inner competitors at the same time, because different objects are being compared. Sorting values of a dictionary based on a list. This could be done by wrapping listA inside a custom sorted list like so: Then you can use this custom list as follows: Of course, this custom list will only be valid as long as the elements in the original list do not change. This comparator sorts the list of values alphabetically. Excuse any terrible practices I used while writing this code, though. Does this require that the values in X are unqiue? Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Sort a list of Object according to custom priority of value in the Object JAVA 11, sort list of object on java 8 with custom criteria, Sort list based on specific order in java, (Java) Using lambda as comparator in Arrays.sort, How can I sort a list based on another list values in Java, Android Java - I need to sort a list based on another list, Intersection and union of ArrayLists in Java. So you could simply have: What I am doing require to sort collection of factories and loop through all factories and sort collection of their competitors. It returns a stream sorted according to the natural order. Working on improving health and education, reducing inequality, and spurring economic growth? B:[2,1,0], And you want to load them both and then produce: O(n) look up happening roughly O(nlogn) times? The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. How to Sort a HashMap by Value in Java? | DigitalOcean This is an old question but some of the answers I see posted don't actually work because zip is not scriptable. How do you get out of a corner when plotting yourself into a corner, Trying to understand how to get this basic Fourier Series. It would be helpful if you would provide an example of your expected input and output. Not the answer you're looking for? You get paid; we donate to tech nonprofits. Though it might not be obvious, this is exactly equivalent to, This is correct, but I'll add the note that if you're trying to sort multiple arrays by the same array, this won't neccessarily work as expected, since the key that is being used to sort is (y,x), not just y. In our case, we're using the getAge() method as the sorting key. The method returns a comparator that imposes the reverse of the natural ordering. super T> comparator), Defining a Custom Comparator with Stream.sorted(). We can also create a custom comparator to sort the hash map according to values. zip, sort by the second column, return the first column. MathJax reference. 2. How can we prove that the supernatural or paranormal doesn't exist? "After the incident", I started to be more careful not to trip over things. His title should have been 'How to sort a dictionary?'. What happens if you have in List1, 50, 40 30 , and in List2 50 45 42? If you have any suggestions for improvements, please let us know by clicking the report an issue button at the bottom of the tutorial. Sorting for String values differs from Integer values. This will sort all factories according to their price. How do you get out of a corner when plotting yourself into a corner. The order of the elements having the same "key" does not matter. Sort a List of Objects by Field in Java - Hire Amir JavaTpoint offers too many high quality services. Maybe you can delete one of them. Is it suspicious or odd to stand by the gate of a GA airport watching the planes? Let the size of A1 [] be m and the size of A2 [] be n. Create a temporary array temp of size m and copy the contents of A1 [] to it. When we try to use sort over a zip object. NULL). The most obvious solution to me is to use the key keyword arg. If the elements are not comparable, it throws java.lang.ClassCastException. Here is Whatangs answer if you want to get both sorted lists (python3). Finally, we've used a custom Comparator and defined custom sorting logic. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. For more information on how to set\use the key parameter as well as the sorted function in general, take a look at this. That is, the first items (from Y) are compared; and if they are the same then the second items (from X) are compared, and so on. If you already have a dfwhy converting it to a list, process it, then convert to df again?