sort list based on another list java

A:[c,b,a] For example, explain why your solution is better, explain the reasoning behind your solution, etc. 2. Can airtags be tracked from an iMac desktop, with no iPhone? We're streaming that list, and using the sorted() method with a Comparator. You are using Python 3. It returns a stream sorted according to the natural order. In Python 2, zip produced a list. Using a For-Each Loop May be just the indexes of the items that the user changed. How can I randomly select an item from a list? Filtering a Java Collection by a List | Baeldung 2023 DigitalOcean, LLC. 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(). Sorting Strings is a tiny bit different, since it's a bit less intuitive on how to compare them. However, some may lead to under-performing solutions if not done properly. DigitalOcean makes it simple to launch in the cloud and scale up as you grow whether youre running one virtual machine or ten thousand. :param lists: lists to be sorted :return: a tuple containing the sorted lists """ # Create the initially empty lists to later store the sorted items sorted_lists = tuple([] for _ in range(len(lists))) # Unpack the lists, sort them, zip them and iterate over them for t in sorted(zip(*lists)): # list items are now sorted based on the first list . The solution below is simple and should fix those issues: Location of index in list2 is tracked using cur_loclist. 2) Does listA and listB contain references to the same objects, or just objects that are equivalent with equals()? The solution below is the most efficient in this case: Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 2023 DigitalOcean, LLC. How to sort one list and re-sort another list keeping same relation python? Use MathJax to format equations. The below given example shows how to do that in a custom class. We've used the respective comparison approaches for the names and ages - comparing names lexicographically using compareTo(), if the age values are the same, and comparing ages regularly via the > operator. How to remove an element from a list by index, Sorting an array of objects by property values, String formatting: % vs. .format vs. f-string literal. Create a Map that maps the values of everything in listB to something that can be sorted easily, such as the index, i.e. Rather than using a list to get values from the map, well be using LinkedHashMap to create the sorted hashmap directly. Try this. The code below is general purpose for a scenario where listA is a list of Objects since you did not indicate a particular type. The solution here is not to make your class implements Comparator and define a custom comparator class, like. A stream represents a sequence of elements and supports different kind of operations that lead to the desired result. Did you try it with the sample lists. In Java there are set of classes which can be useful to sort lists or arrays. You can use a Bean Comparator to sort this List however you desire. 2023 ITCodar.com. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Using Kolmogorov complexity to measure difficulty of problems? more_itertools has a tool for sorting iterables in parallel: I actually came here looking to sort a list by a list where the values matched. Once you have that, define your own comparison function which compares values based on the indexes of list. Is the God of a monotheism necessarily omnipotent? 2. Once we have the list of values in a sorted manner, we build the HashMap again based on this new list. Thanks for your answer, I learned a lot. Note: Any item not in list1 will be ignored since the algorithm will not know what's the sort order to use. A tree illustrates a hierarchical structure in contrast to other data structures such an array, stack, queue, and linked list, which are linear in nature. How do you get out of a corner when plotting yourself into a corner. - the incident has nothing to do with me; can I use this this way? rev2023.3.3.43278. then the question should be 'How to sort a dictionary? Here if the data type of Value is String, then we sort the list using a comparator. I am a bit confused with FactoryPriceComparator class. - the incident has nothing to do with me; can I use this this way? Created a default comparator on bookings to sort the list. Learn more. Connect and share knowledge within a single location that is structured and easy to search. You can have an instance of the comparator (let's call it factoryPriceComparator) and use it like: Collections.sort (factoriesList, factoryPriceComparator);. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? All times above are in ranch (not your local) time. I used java 8 streams to sort lists and put them in ArrayDeques. If you preorder a special airline meal (e.g. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Surly Straggler vs. other types of steel frames. 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. My question is how to call compare method of factoryPriceComparator to sort factories? Edit: Fixed this line return this.left.compareTo(o.left);. Here is Whatangs answer if you want to get both sorted lists (python3). Then the entire class is added to a list where you can sort on the individual properties if required. 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. A example will show this. But because you also like to be able to sort history based on frequency, I would recommend a History class: Then create a HashMap to quickly fill history, and convert it into a TreeSet to sort: Java List.Add() Unsupportedoperationexception, Keyword for the Outer Class from an Anonymous Inner Class, Org.Hibernate.Hibernateexception: Access to Dialectresolutioninfo Cannot Be Null When 'Hibernate.Dialect' Not Set, Convert Timestamp in Milliseconds to String Formatted Time in Java, How to Query Xml Using Namespaces in Java with Xpath, Convenient Way to Parse Incoming Multipart/Form-Data Parameters in a Servlet, How to Convert the Date from One Format to Another Date Object in Another Format Without Using Any Deprecated Classes, Eclipse 2021-09 Code Completion Not Showing All Methods and Classes, Rotating Coordinate Plane for Data and Text in Java, Java Socket Why Server Can Not Reply Client, How to Fix the "Java.Security.Cert.Certificateexception: No Subject Alternative Names Present" Error, Remove All Occurrences of Char from String, How to Use 3Des Encryption/Decryption in Java, Creating Multiple Log Files of Different Content with Log4J, Very Confused by Java 8 Comparator Type Inference, Copy a Stream to Avoid "Stream Has Already Been Operated Upon or Closed", Overload with Different Return Type in Java, Eclipse: How to Build an Executable Jar with External Jar, Stale Element Reference: Element Is Not Attached to the Page Document, Method for Evaluating Math Expressions in Java, How to Use a Tablename Variable for a Java Prepared Statement Insert, Why am I Getting Java.Lang.Illegalstateexception "Not on Fx Application Thread" on Javafx, What Is a Question Mark "" and Colon ":" Operator Used For, How to Validate Two or More Fields in Combination, About Us | Contact Us | Privacy Policy | Free Tutorials. Solution based on bubble sort (same length required): If the object references should be the same, you can initialize listA new. It only takes a minute to sign up. O(n) look up happening roughly O(nlogn) times? Using Java 8 Streams Let's start with two entity classes - Employee and Department: The . Do you know if there is a way to sort multiple lists at once by one sorted index list? What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? People will search this post looking to sort lists not dictionaries. How to use Slater Type Orbitals as a basis functions in matrix method correctly? I don't know if it is only me, but doing : Please add some more context to your post. The method signature is: Comparable is also an interface belong to a java.lang package. Examples: Input: words = {"hello", "geeksforgeeks"}, order = "hlabcdefgijkmnopqrstuvwxyz" Output: "hello", "geeksforgeeks" Explanation: 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: What video game is Charlie playing in Poker Face S01E07? 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. 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. Merge two lists in Java and sort them using Object property and another condition, How Intuit democratizes AI development across teams through reusability. To avoid having a very inefficient look up, you should index the items in listB and then sort listA based on it. I like having a list of sorted indices. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Why do small African island nations perform better than African continental nations, considering democracy and human development? Java 8 Streams: Find Items From One List Based On Values From Another List This can create unstable outputs unless you include the original list indices for the lexicographic ordering to keep duplicates in their original order. 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. Sign up for Infrastructure as a Newsletter. rev2023.3.3.43278. http://scienceoss.com/sort-one-list-by-another-list/. The signature of the method is: It also returns a stream sorted according to the provided comparator. Using Comparator. That way, I can sort any list in the same order as the source list. Then we sort the list. The answer of riza might be useful when plotting data, since zip(*sorted(zip(X, Y), key=lambda pair: pair[0])) returns both the sorted X and Y sorted with values of X. The signature of the method is: Let's see another example of Collections.sorts() method. All the elements in the list must implement Comparable interface, otherwise IllegalArgumentException is thrown. Do I need a thermal expansion tank if I already have a pressure tank? This work is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License. One way of doing this is looping through listB and adding the items to a temporary list if listA contains them: Not completely clear what you want, but if this is the situation: Just remember Zx and Zy are tuples. Sorting list based on another list's order. Sorting a Java list collection using Lambda expression Since Java 8 with Lambda expressions support, we can write a comparator in a more concise way as follows: 1 Comparator<Book> descPriceComp = (Book b1, Book b2) -> (int) (b2.getPrice () - b1.getPrice ()); Reserve String without reverse() function, How to Convert Char Array to String in Java, How to Run Java Program in CMD Using Notepad, How to Take Multiple String Input in Java Using Scanner, How to Remove Last Character from String in Java, Java Program to Find Sum of Natural Numbers, Java Program to Display Alternate Prime Numbers, Java Program to Find Square Root of a Number Without sqrt Method, Java Program to Swap Two Numbers Using Bitwise Operator, Java Program to Break Integer into Digits, Java Program to Find Largest of Three Numbers, Java Program to Calculate Area and Circumference of Circle, Java Program to Check if a Number is Positive or Negative, Java Program to Find Smallest of Three Numbers Using Ternary Operator, 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