sort list based on another list java

If you have 2 lists of identical number of items and where every item in list 1 is related to list 2 in the same order (e.g a = 0 , b = 1, etc.) What is the shortest way of sorting X using values from Y to get the following output? Try this. No spam ever. Oh, ignore, I can do sorted(zip(Index,X,Y,Z)) too. Java Sort List Objects - Comparator Summary Collections class sort () method is used to sort a list in Java. In addition, the proposed solution won't work for the initial question as the lists X and Y contain different entries. Find the max recommended item from second sublist (3 to end of list) and add it to the newly created list and . One with the specific order the lists should be in (listB) and the other has the list of items (listA). QED. I am a bit confused with FactoryPriceComparator class. Sorry, that was my typo. Does a summoned creature play immediately after being summoned by a ready action? Learn more. Something like this? Its likely the second set is a subset of the first. Thanks for learning with the DigitalOcean Community. That's right but the solutions use completely different methods which could be used for different applications. Check out our offerings for compute, storage, networking, and managed databases. Here we will learn how to sort a list of Objects in Java. I fail to see where the problem is. 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. Thanks for your answer, but I get: invalid method reference: "non-static method getAge() cannot be referenced from a static context" when I call interleaveSort. The below given example shows how to do that in a custom class. If head is null, return. How do you ensure that a red herring doesn't violate Chekhov's gun? Using Java 8 Streams Let's start with two entity classes - Employee and Department: The . That's O(n^2 logn)! How can I pair socks from a pile efficiently? Learn more about Stack Overflow the company, and our products. There is a major issue with this answer: You are inserting a reference to the object originally in listB into listA, which is incorrect behavior if the two objects are equals() but do not refer to the same object - the original object in listA is lost and some references in listA are replaced with references in listB, rather than listA being simply reordered. I mean swapItems(), removeItem(), addItem(), setItem() ?? You are using Python 3. Create a Map that maps the values of everything in listB to something that can be sorted easily, such as the index, i.e. Can I tell police to wait and call a lawyer when served with a search warrant? If you notice the above examples, the Value objects implement the Comparator interface. How do you get out of a corner when plotting yourself into a corner. Sorting a List of Integers with Stream.sorted () Found within the Stream interface, the sorted () method has two overloaded variations that we'll be looking into. We can use the following methods to sort the list: Using stream.sorted () method Using Comparator.reverseOrder () method Using Comparator.naturalOrder () method Using Collections.reverseOrder () method Using Collections.sort () method Java Stream interface Java Stream interface provides two methods for sorting the list: sorted () method How Intuit democratizes AI development across teams through reusability. As for won't work..that's right because he posted the wrong question in the title when he talked about lists. Making statements based on opinion; back them up with references or personal experience. String values require a comparator for sorting. (This is a very old answer!). This work is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License. Connect and share knowledge within a single location that is structured and easy to search. I see where you are going with it, but you need to rethink what you were going for and edit this answer. DigitalOcean makes it simple to launch in the cloud and scale up as you grow whether youre running one virtual machine or ten thousand. So in a nutshell, we can sort a list by simply calling: java.util.Collections.sort(the list) as shown in the following example: The above class creates a list of four integers and, using the collection sort method, sorts this list (in one line of code) without us having to worry about the sorting algorithm. Guide to Java 8 Collectors: groupingByConcurrent(), Java 8 - Difference Between map() and flatMap(), Java: Finding Duplicate Elements in a Stream, Java - Filter a Stream with Lambda Expressions, Guide to Java 8 Collectors: averagingDouble(), averagingLong() and averagingInt(), Make Clarity from Data - Quickly Learn Data Visualization with Python, // Constructor, getters, setters and toString(), Sorting a List of Integers with Stream.sorted(), Sorting a List of Integers in Descending Order with Stream.sorted(), Sorting a List of Strings with Stream.sorted(), Sorting Custom Objects with Stream.sorted(Comparator comparator), Defining a Custom Comparator with Stream.sorted(). 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. You can use a Bean Comparator to sort this List however you desire. The common non-linear data structure known as a tree. How do you get out of a corner when plotting yourself into a corner, Trying to understand how to get this basic Fourier Series. The collect() method is used to receive elements from a stream and stored them in a collection. 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. Other answers didn't bother to import operator and provide more info about this module and its benefits here. Can I tell police to wait and call a lawyer when served with a search warrant? This solution is poor when it comes to storage. Why is "1000000000000000 in range(1000000000000001)" so fast in Python 3? . How do I read / convert an InputStream into a String in Java? Any suggestions? In which case this answer is somewhat valid, but just needs to be the intersection of sets (remove missing elements). I am also wandering if there is a better way to do that. Speed improvement on JB Nizet's answer (from the suggestion he made himself). This method will also work when both lists are not identical: Problem : sorting a list of Pojo on the basis of one of the field's all possible values present in another list. 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. HashMap entries are sorted according to String value. Find centralized, trusted content and collaborate around the technologies you use most. My use case is this: user has a list of items initially (listA). If you preorder a special airline meal (e.g. - the incident has nothing to do with me; can I use this this way? How do I make a flat list out of a list of lists? Using Comparator. 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. Just remember Zx and Zy are tuples. Python. 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. His title should have been 'How to sort a dictionary?'. This is an old question but some of the answers I see posted don't actually work because zip is not scriptable. Sorting a list based on another list's values - Java 16,973 Solution 1 Get rid of the two Lists. Let's say we have the following code: Let's sort them by age, first. HashMaps are a good method for implementing Dictionaries and directories. Then you can create your custom Comparator that uses the Map to create an order: Then you can sort listA using your custom Comparator. Specifically, we're using the comparingInt() method, and supplying the user's age, via the User::getAge method reference. The signature of the method is: In the following example, we have used the following methods: The reverseOrder() is a method of Comparator interface which is defined in java.util package. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Sorting a list in Python using the result from sorting another list, How to rearrange one list based on a second list of indices, How to sort a list according to another list? It is from Java 8. Your problem statement is not very clear. So we pass User::getCreatedOn to sort by the createdOn field. 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. 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(). The signature of the method is: It also returns a stream sorted according to the provided comparator. Just encountered the same problem. Mail us on [emailprotected], to get more information about given services. While we believe that this content benefits our community, we have not yet thoroughly reviewed it. 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. Java List is similar to arrays except that the length of the list is dynamic and it comes in Java Collection framework. It would be preferable instead to have a method sortCompetitors(), that would sort the list, without leaking it: and remove completely the method getCompetitors(). "Sunday" => 0, , "Saturday" => 6. Guava has a ready-to-use comparator for doing that: Ordering.explicit(). Here is my complete code to achieve this result: But, is there another way to do it? Other answers didn't bother to import operator and provide more info about this module and its benefits here. 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