What would stop a large spaceship from looking like a flying brick? I can leave a pastebin link in here though, if that helps you. I have two lists - one is list of strings, and the other is list of MyClass objects. rev2023.7.7.43526. Iterate over 2 lists in java Ask Question Asked 5 years, 10 months ago Modified 5 months ago Viewed 11k times 5 List<String> listA = new Arraylist (); List<String> listB = new Arraylist (); Given above 2 lists, I want to iterate and call the same method on each element. There are going to be some rough edges. I didn't pay much attention to the code of. Find centralized, trusted content and collaborate around the technologies you use most. How to perfect forward variadic template args with default argument std::source_location? 587), The Overflow #185: The hardest part of software is requirements, Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Temporary policy: Generative AI (e.g. How to seal the top of a wood-burning cooking stove? Thanks for contributing an answer to Stack Overflow! Connect and share knowledge within a single location that is structured and easy to search. In Java, how to traverse two lists at the same time? It is good to see teachers who aren't scared to teach Streams code, So at this point you have a stream of one or more PickOrderLine objects which matched your filter. And how can you make the. Has a bill ever failed a house of Congress unanimously? Miniseries involving virtual reality, warring secret societies. Stream iterate(T,Predicate,UnaryOperator) method in Java with examples Find centralized, trusted content and collaborate around the technologies you use most. 1 2 3 4 5 6 7 8 9 10 11 private Product getNextProduct () { for (PickOrder pickOrder : pickOrders) { for (PickOrderLine pickOrderLine : pickOrder.getPickOrderLines ()) { if (pickOrderLine.getQuantity () > quantityOnHand.get (pickOrderLine.getProductCode ())) { return productCollection.findByCode (pickOrderLine.getProductCode ()); } } } return null; I have some problems with some foreach loops in my code. Asking for help, clarification, or responding to other answers. 2. prefer count in place of list1.size() and compute count as Math.min( list1.size(), list2.size()) to be safe. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. Not the answer you're looking for? 4. 2. If you want to achieve such iteration called "zipping", as mentioned in the another answer, you have to iterate the indices. Different maturities but same tenor to obtain the yield. Given two sorted linked lists, how can I combine them into one - Quora Is it legal to intentionally wait before filing a copyright lawsuit to maximize profits? I am trying to convert the below code to Java 8 (using streams) but not sure how exactly to iterate through 2 lists together using streams. Would it be possible for a civilization to create machines before wheels? In any case, your solution can be more concise if you skip the intermediary map variable with the mapping of ids to lists of users: Btw, in case you're wondering if the .stream() there could be .parallelStream(), it would be pointless, due to the synchronization in the println method of System.out (a PrintStream). This article is being improved by another user right now. I tried to add a return on the start, because there is a return statement in the if statement, though when I add the return at the start. unfortunately you can't use a stream for manipulating 2 lists at the same time. java - Iterate two lists and find matches - Code Review Stack Exchange What are the differences between a HashMap and a Hashtable in Java? What would stop a large spaceship from looking like a flying brick? 24 I want to iterate two lists and get new filtered list which will have values not present in second list. I'm having fun with Java's Stream library and lambdas. Is religious confession legally privileged? How can I learn wizard spells as a warlock without multiclassing? How do I simultaneously iterate through a list and a set while pairing them in another map (using stream), Why on earth are people paying for digital real estate? Why free-market capitalism has became more associated to the right than to the left, to which it originally belonged? We can do something similar with the stream method. Has a bill ever failed a house of Congress unanimously? Spawn multiple of this therad and you can iterate your list in parallel. In the last few java 8 posts, we looked into Java 8 Interface Changes and Functional Interfaces and Lambda Expressions. If and When can a Priest May Reveal Something from a Penitent's Confession? 1 I have 2 lists with varying length. Not the answer you're looking for? You cannot use the parallel features of streams with the system you have. Purpose of the b1, b2, b3. terms in Rabin-Miller Primality Test, Non-definability of graph 3-colorability in first-order logic. Follow edited Dec 23, 2022 at 7:36. shmosel . Was the Garden of Eden created on the third or sixth day of Creation? 4 Answers Sorted by: 3 A while loop with suitable input can do the job, assuming no newline characters in the file names. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. Is speaking the country's language fluently regarded favorably when applying for a Schengen visa? Cannot move a file from one directory to other. The second element is generated by applying the function to the first element. 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. In Java, how to traverse two lists at the same time? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, Filter HashMap based on multiple 'optional' conditions, Why on earth are people paying for digital real estate? You shouldn't use this method when using LinkedLists.Each iteration the get method will iterate from the beginning of the list to the current element, which leads to O(n) asymptotic performance. Is a dropper post a good solution for sharing a bike between two riders? Why free-market capitalism has became more associated to the right than to the left, to which it originally belonged? java; lambda; . Look at this question to see how to do it: Zipping streams using JDK8 with lambda (java.util.stream.Streams.zip). In what circumstances should I use the Geometry to Instance node? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Can you work in physics research with a data science degree? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 587), The Overflow #185: The hardest part of software is requirements, Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood, Temporary policy: Generative AI (e.g. acknowledge that you have read and understood our. Ok, I searched, what's this part on the inner part of the wing on a Cessna 152 - opposite of the thermometer, Is there a deep meaning to the fact that the particle, in a literary context, can be used in place of . The iterate(T, java.util.function.Predicate, java.util.function.UnaryOperator) method allows us to iterate stream elements till the specified condition. Book or a story about a group of people who had become immortal, and traced it back to a wagon train they had all been on. If one of the arrays have fewer elements than the other, it will be as if they were truncated to the length of the smallest. I am not sure, if that is the case. Find the maximum and minimum of a function with three variables, A sci-fi prison break movie where multiple people die while trying to break out. Set<String> set = new TreeSet<String> (A); // for keeping the output sorted else you can also use java.util.HashSet set.addAll (B); List<String> finalList = new ArrayList<String> (set); There are two ways to merge the results of both lists: using List#addAll or Set#addAll. will provide coding tutorials to become an expert, Create a Maven Project using command prompt. Does every Banach space admit a continuous (not necessarily equivalent) strictly convex norm? Basically, iterating over the list with 3 conditions if any of them is satisfied want to break loop and in every condition want to call different method. What are the advantages and disadvantages of the callee versus caller clearing the stack after a call? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Understanding Why (or Why Not) a T-Test Require Normally Distributed Data? java; java-8; Share. rev2023.7.7.43526. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. How to iterate list inside a lambda filter stream in Java 8? Different Ways to Iterate an ArrayList - HowToDoInJava Seems like your issue centers in the ability of knowing the index of the object you are iterating on. 1. This does not offer parallel execution but neither did the original zip implementation. Is it legal to intentionally wait before filing a copyright lawsuit to maximize profits? Is the part of the v-brake noodle which sticks out of the noodle holder a standard fixed length on all noodles? Was the Garden of Eden created on the third or sixth day of Creation? What you can do is to work with the iterator. 10 ways to join two lists in Java | Techie Delight Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, This code will not do what you think it does; use, Your "basically" doesn't describe what you're doing, as you're. How does the theory of evolution make it less likely that the world is designed? To learn more, see our tips on writing great answers. A while loop with suitable input can do the job, assuming no newline characters in the file names. 6 ways to iterate or loop a Map in Java Connect and share knowledge within a single location that is structured and easy to search. What you can do is to work with the iterator. Your code and Java 8 usage looks fine in general to me. As you say that both the list are of same size, then you can use "for" loop instead of "for-each" loop. Why did Indiana Jones contradict himself? Iterate arraylist with standard for loop ArrayList<String> namesList = new ArrayList<String>(Arrays.asList( "alex", "brian", "charles") ); for(int i = 0; i < namesList.size(); i++) { System.out.println(namesList.get(i)); } Use MathJax to format equations. - wardva It is so much to go through. Are there ethnically non-Chinese members of the CCP right now? What would stop a large spaceship from looking like a flying brick? What is the grammatical basis for understanding in Psalm 2:7 differently than Psalm 22:1? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Iterating over two lists using Java 8 streams. ChatGPT) is banned, Testing native, sponsored banner ads on Stack Overflow (starting July 6), Java 8 streams: iterate over Map of Lists, Java Streams: Combining two collections into a map, Java 8 Iterate List inside an list and stream.map(), Map within List - How to Iterate using Stream, Iterating a list inside a map of map using java 8 streams, Java 8 Streams: Iterate Over a List Inside a Map, double forEach stream over set and hashmap Java. bioinformatics applications, it seems), then you are better off just iterating over one of the sets and then constructing the name of the corresponding files from the other set. Design a Real FIR with arbitrary Phase Response. For example, the .values() on the peopleById requires creating an additional Set, so, at that point, you have a full Map, as well as a full Set of people Lists. you can zip two ArrayLists (or any RandomAccessList) like, (unless you implement a Spliterator directly), Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Does "critical chance" have any reason to exist? Not the answer you're looking for? How to iterate two lists simultaneously using Java 8 what would be most optimal way to rewrite this iteration with java 8 stream(). ChatGPT) is banned, Testing native, sponsored banner ads on Stack Overflow (starting July 6). PCA Derivation with maximizing projection length. Welcome to Java 8 Stream API tutorial. Learn more about Stack Overflow the company, and our products. Is religious confession legally privileged? Note, if you do not need to keep the Mapping of ID's to People lists, the whole thing can be condensed to: Thanks for contributing an answer to Code Review Stack Exchange! When practicing scales, is it fine to learn by reading off a scale book instead of concentrating on my keyboard? @OleV.V. How can I learn wizard spells as a warlock without multiclassing? No, you wouldn't; you would have to psot a simplified version representing an SSCCE. 1. Making statements based on opinion; back them up with references or personal experience. To be complete: add it.next() into the loop and a message if the one iterator has remaining items. The stream first filters away all values not present in the map, then finds the first hit, and executes its method if found. How much space did the 68000 registers take up? How could I improve this List iteration with a Stream? Parameters: This method accepts three parameters: Return value: This method returns a new sequential Stream. This would be in Java to make a new stream from two existing streams by combining each of two corresponding elements of the given streams. And as F. Bller has pointed out it doesnt work if bs is infinite and as is not. How to seal the top of a wood-burning cooking stove? However I consider this answer more helpful than any answer that tries to answer the question as asked. How to iterate over a list in Java To learn more, see our tips on writing great answers. Do modal auxiliaries in English never change their forms? Browse other questions tagged. This seems simple enough, not complex. Find the maximum and minimum of a function with three variables. 1. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How to seal the top of a wood-burning cooking stove? What is a Map in Java? Simplified Product to a String. Your email address will not be published. Connect and share knowledge within a single location that is structured and easy to search. Im trying to iterate through a list and a set in parallel (both are of the same size). However, I would make two suggestions: It can be done using IntStream to generate stream of indexes for both lists, then filter out not relevant list values and match the remaining ones: You can simplify your code with IntStream#noneMatch method as follows: See also: Filter HashMap based on multiple 'optional' conditions. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Iterating through a Collection, avoiding ConcurrentModificationException when removing objects in a loop. pseudocode. "vim /foo:123 -c 'normal! There's no way around that. In this tutorial we will learn ArrayList in java with example In Java we can achieve the dynamic array using arraylist.ArrayList class available on util package, so we don't need to import any extra packages, In below example created new arraylist added value to arraylist printing the array list value by using for loop Continue reading How to create a map of sets from stream of pairs? I think my Bridge's foundation is too fragile, Wet Chairs problem from Australian Informatics Olympiad, Implementing a singly linked list with empty list represented as null, Typo in cover letter of the journal name where my manuscript is currently under review. iterating and filtering two lists using java 8 - Stack Overflow What languages give you access to the AST to modify during compilation? That in itself is very bad. How to add a specific page to the table of contents in LaTeX? How to add a specific page to the table of contents in LaTeX? if you explain what actually you are trying to do, instead of a code which does nothing significant, may be you can get a different suggestion than looping through two directories in a single for loop. This would be in Java to make a new stream from two existing streams by combining each of two corresponding elements of the given streams. The resulting sequence returned by this method may be empty if passed predicate does not hold on the seed value. Extract data which is inside square brackets and seperated by comma. I just need to turn my for each loops into one stream, So what does your original code return if it doesn't find a match? MathJax reference. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Answer (1 of 2): This can be done without using any extra nodes. A seed is the first element of the stream. Today we will look into one of the major API introduced in Java 8 - Java Stream. If you have a look in the, I have no idea. Is there a legal way for a country to gain territory from another through a referendum? You could create your own Iterator which encapsulates the above logic: If all three lists are to be iterated together as you expect, that means they are tightly related and qualify to be an object of some type. java - How do I simultaneously iterate through a list and a set while How do I iterate over multiple lists in parallel in Java? 1. Check if it works for you. Asking for help, clarification, or responding to other answers. Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. In what circumstances should I use the Geometry to Instance node? 587), The Overflow #185: The hardest part of software is requirements, Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood. List<String> list1; List<MyClass> list2; MyClass { MyClass (String val) { this.str = val; } String str; . Using Plain Java However, if you have a larger number of lists or more complex data that requires nested loops, then you're setting yourself up to easily make mistakes. Thank you for your valuable feedback! I want to iterate files of 2 directories 1 by 1, dir1 has many files dir2 has many files I want to work on file1 from dir1 and file1 from dir2 and so on, Thank you Can you tell me what is IFS-thwarting characters or you can give me link, Rather than deleting elements from arrays, I'd recommend iterating over the array index(es). Simply changing it to the following will do: It is a good thing that you use the Collectors.groupingBy to provide a Map