convert arraylist to iterable java

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Sort array of objects by string property value, Check if a given key already exists in a dictionary. If you use a += under the covers Java will convert that to using a StringBuilder. Thanks for this, I used your solution in one project. This inherits from a Vector class. The Collection interface (java.util.Collection) and Map interface (java.util.Map) are the two main root interfaces of Java collection classes. How to determine length or size of an Array in Java? 2. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. Just be sure you check the return of iterator() since it may be empty or null depending on the implementation. With the advent of Java-8, we can use streams for data manipulation in a very easy/succinct way. The <= in the for statement should be a <. It has been Quite a while since Java 8 released. John, the LinkedHashMap is important to the solution as it provides predictable iteration order. Use the entry set, like. Java Result: 1. If I manage to create a more complete implementation, perhaps I will post it to Github and then to it link in an updated version of this answer. at java.lang.Integer.parseInt(Integer.java:504) Thankfully Collections.sort() dump the list to an array first, to avoid precisely this kind of error (but still, dumping an ArrayList to an array should be faster than doing the same for a LinkedList). Sun light takes 1,000/30,000/100,000/170,000/1,000,000 years bouncing around inside to then reach the Earth. Home Core Java util Iterator Iterable Java Example java.lang.Iterable Interface, Posted by: Prasad Saya In order to figure it out, the three main advantages are mentioned below: Note: All these collections can be imported using: However, single classes can also be imported by replacing * with the class name as shown. Next, take the second character. 1. The source code is "public Ordering onResultOf" , I even don't know how it compiles ! This is a common tasks to avoid duplicates in the list. Case 4: Wildcards been introduced in java but still will throw an exception at the runtime. First take input from the user as int, convert it into String, and make a character array of size of str.length(). Just be sure you check the return of iterator() since it may be empty or null depending on the implementation. Understand the steps needed to write the code. this.base = base; We can add or remove elements anytime. 2. Enter your email address to subscribe to new posts. ConcurrentLinkedQueue class also belongs to java.util.concurrent package. This is not recommended being used in a single-threaded environment as it might cause extra overheads. This method uses a wildcard character signifying that a collection of any data types can be passed into the removeAll() method. WebMethods Detail. Easiest way to convert int to string in C++. Understand the steps needed to write the code. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. Therefore, though the main aim of all the collections is the same, the implementation of all these collections was defined independently and had no correlation among them. You don't need to convert int to String. The map is sorted according to the natural ordering of its keys, or by a Comparator provided at map creation time, depending on which constructor is used. I felt such a solution would be too large to include in a Stack Overflow answer. Let's see how we can use Guava to convert from an Iterable to a List: We can create a new List from Iterable or Iterator using Lists.newArrayList(): List result = Lists.newArrayList(iterable); Or we can use ImmutableList.copyOf(): List result = ImmutableList.copyOf(iterable); 5. File permissions are required to be changed when the user wants to restrict the operations permissible on a file. Instead, your loop should have the condition i). Why the calculated cost of a loan is less than expected? Integer::valueOf Modifies the collection by adding all of the elements in the specified array to the collection. package com.java.w3schools.blog.arraylist; import java.util.ArrayList; import java.util.List; /** * * Syntax: func_name(variable name(s)); Important methods of Parameter Passing. One important advantage of this approach is that it actually returns a Map, unlike some of the other solutions offered here. DelayQueue class belongs to java.util.concurrent package implementing the BlockingQueue interface. A thread trying to enqueue an element in a full queue is blocked until some other thread makes space in the queue, either by dequeuing one or more elements or clearing the queue completely. Method 4: Using Iterator. You can easily revert it if it's required and convert it to int[]. It is our most basic deploy profile. For a relatively simple operation, there's surprisingly no support in the standard Java collection APIs. You don't have to use substring(). WebBasically - this same tutorial will help you if you want to convert gson fromjson to map, gson fromjson to list, json fromjson to array, json string to arraylist in java. Once created, the capacity cannot be changed. All these methods are implemented in this interface because these methods are implemented by all the classes irrespective of their style of implementation. The elements in ConcurrentSkipListSet are sorted by default in their natural ordering or by a Comparator provided at set creation time, depending on which constructor is used. We can use Java 8 Stream to convert List to List. The question is about sorting by value. Collections.max(): Returns the maximum element of the given collection, according to the Iterable forEach() method : This is newly introduced method in Iterable interface in Java 1.8 version and Collection interface extends Iterable interface; So, all implementing classes of List, Set and Queue can use forEach() method to iterate through all It is used when the objects are supposed to be processed based on priority. This is the root interface for the entire collection framework. Stack is a class is based on the basic principle of last-in-first-out. Strange horizontal space when using babel's \foreignlanguage in a LLNCS document. Linux - RAM Disk as part of a Mirrored Logical Volume. 2. ConcurrentLinkedDeque class implements the Collection interface and the AbstractCollection class. Note that arr can also be any Iterable (such as a list), not just an array. Java ArrayList class uses a dynamic array for storing the elements. We will show you how to create a table in HBase using the hbase shell CLI, insert rows into the table, You can use streams to sort the map entries by value and create a LinkedHashMap which preserves insertion-order iteration. It is mainly used in the scenarios where Students are needed to be searched or removed or added according to the roll numbers or in item-frequency scenarios where items are stored along with their frequencies. It has been Quite a while since Java 8 released. Methods Detail. String string = "find string"; indexof() and lastIndexOf methods return int value as index of the found character. It extends AbstractMap and implements the Map interface in Java. So the above example could be modified like this: To subscribe to this RSS feed, copy and paste this URL into your RSS reader. This is not recommended being used in a single-threaded environment as it might cause extra overheads. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. 1. Using Apache Commons We may greeted with ConcurrentModificationException if it is not implemented properly. If you do anything whatsoever that would cause a lookup to happen on a key that isn't in the map -- a Map.equals call, containsKey, anything -- it will break with really weird stack traces.". One of them is forEach Method in java.lang.Iterable Interface. This way you can easily add more dependencies. How do I efficiently iterate over each entry in a Java Map? List lists = new ArrayList()Type mismatch: cannot convert from ArrayList to List AyyayListjavaArrayListArrayList Why does the tongue of the door lock stay in the door, and the hole in the door frame? In order to implement a new feature or a class, there is no need to define a Integer.toString(n).chars().map(a->a-'0').toArray(); Added support for negative values check my answer below ( For new developers since it's been 8 years ), @JonSkeet Can you explain me why you have put, @KasunSiyambalapitiya: Because that's the simplest way to get from. can you leave your luggage at a hotel you're not staying at? This will leave you with ArrayList containing your digits in reverse order. 3. ConcurrentHashMap class implements ConcurrentMap as well as Serializable interface also. Can the Congressional Committee that requested Trump's tax return information release it publicly? 6. NavigableSet class inherits from the SortedSet interface. Search for: Collection in java. Collections.max(): Returns the maximum element of the given collection, according to the Keys are distinct in a map so you succeed to keep duplicate values (which are sorted by keys by the way). Simplest: dump the whole collection into a Set (using the Set(Collection) constructor or Set.addAll), then see if the Set has the same size as the ArrayList. These 2 items are vital for ensuring the map contract is kept; if you think you don't want that, then you're almost at the point of reversing the map entirely (to Map). The for-each loop is used for iterating over arrays, collections etc. Modifies the collection by adding all of the elements in the specified array to the collection. Anatomy of plucking hand's motions for a bass guitar. A more scalable solution would use the entrySet directly, since then the value would be immediately available for each comparison (although I haven't backed this up by numbers). SortedMap interface extends the Map interface and provides a total ordering of its elements (elements can be traversed in sorted order of keys). Steps: Step 1: First Create the LocalDate object using either now() or of() method.now() method gets the current date where as of() creates the LocalDate object with the given year, month and day. It is present in java.util package extends the Set interface present in the collection framework. Java is a trademark or registered trademark of Oracle Corporation in the United States and other countries. A standalone instance has all HBase daemons the Master, RegionServers, and ZooKeeper running in a single JVM persisting to the local filesystem. is used as an actual type parameter. The returned iterable creates a fresh snapshot of the given map each time it's iterated, so barring concurrent modification, it will always reflect the current state of the map. How do I read / convert an InputStream into a String in Java? With the release, they have improved some of the existing APIs and added few new features. Not the answer you're looking for? This is an internal class that just accesses the elements of the list directly, rather than copying them. The iterator has been in Java since Java 1.2. This deals with the index or position-specific functions like getting an element or setting an element. Introduction In this tutorial, You'll learn how to use a break or return in Java 8 Streams when working with the forEach() method. The following code use the for(;;) loop and the Iterator respectively. Below are the various methods to convert an Array to String in Java: Arrays.toString() method: Arrays.toString() method is used to return a string representation of the contents of the specified array. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. TestNGError: A JNI error has occurred, Tomcat Could not publish server configuration for Tomcat v7.0 Server at localhost., mysql 2MySQL . This queue orders elements FIFO (first-in-first-out). Why did anti-communist sentiment in the USA in the 1950s focus on UNESCO? BlockingQueue interface in Java is added in Java 1.5 along with various other concurrent Utility classes like ConcurrentHashMap, Counting Semaphore, CopyOnWriteArrrayList, etc. This now accepts and converts the number appropriately: To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Steps: Step 1: First Create the LocalDate object using either now() or of() method.now() method gets the current date where as of() creates the LocalDate object with the given year, month and day. For me it worked fine to adjust the comparator, if it equals do not return 0 but -1. class ValueComparator implements Comparator {, Map base; By using our site, you If the value of the specified string is negative (string prefixed with ASCII character - ), the solution should preserve the sign in the resultant integer. The code displays the name of the day, Step 2: Next, Get the timezone from operating system Since it is unbounded, adding elements may sometimes fail due to resource exhaustion resulting in OutOfMemoryError. Depending on the context, using java.util.LinkedHashMap which rememebers the order in which items are placed into the map. In other words, how to remove the duplicates from list or collection using java 8 streams. The code line Array.from(String(numToSeparate), Number); will convert the number into a string, take each character of that string, convert it into a number and put in a new array. Pass By Value: Changes made to formal parameter do not get transmitted back to the caller. Did Qatar spend 229 billion USD on the 2022 FIFA World Cup? Any modifications to the formal parameter variable inside the called function or method affect only the separate storage location and will not be reflected in the actual parameter in the calling In order to implement a new feature or a class, there is no need to define a framework. Integer::decode By using our site, you Using Apache Commons 2 Comments }. Javamann. Therefore, this interface contains only one abstract method which is the iterator. The Iterable is defined as a generic type; Iterable, where T type parameter represents the type of elements returned by the iterator.. An object that implements this interface allows it to be the target 1. AbstractQueue provides skeletal implementations of some queue operations. This means retireving items from the tree map will not work. We can also transform a list using Guavas Iterables.transform(). This post will give you understanding how indexof method is used internally. Web2- The Array.from() method creates a new Array instance from an array-like or iterable object, the string '12345' is an iterable object, so it will create an Array from it. I look into Ordering's source code , and totally cannot figure out what .natural().onResultOf() returns! Are you confused between Collection, Collection Interface, Collections Class, Collection Framework? There is no need to import a class if it exists in the same package and we can directly access it. The concrete classes that inherit from AbstractMap can be used to create objects. Please go through the previous post, how String contains() method works in java with examples. The BlockingDeque is an interface, so we cannot declare any objects with it. Note: Java switch statement is a fall through statement that means it executes all statements if break keyword is not used, so it is highly essential to use break keyword inside each case. Using Java 8. 1. java HashMap sorting . It is found in the java.util package. Find centralized, trusted content and collaborate around the technologies you use most. The objects that we insert into the HashSet do not guarantee to be inserted in the same order. This interface is dedicated to storing all the elements where the order of the elements matter consisting of the PriorityQueue, LinkedList, and ArrayDeque. The most important benefit of Streams is that we can create them from the collection, arrays, Files Lines, and even from methods in Stream. It returns the, Now, dwelling onto different methods present in Collection such as add(), removes(), removeAll(), contains(), containsAll(), stream() and many more. PriorityBlockingQueue is an unbounded blocking queue that uses the same ordering rules as class PriorityQueue and supplies blocking retrieval operations. https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html, OptionalLong ifPresentOrElse() method in Java with examples. It has been Quite a while since Java 8 released. It is used to implement an unmodifiable list, for which one needs to only extend this AbstractList Class and implement only the get() and the size() methods. Using Java 8. It can be used when an unbounded Queue is shared among many threads. Either way, recommending people to use Groovy libraries instead of Java libraries in Java code not a good idea. 2. There is no need to import a class if it exists in the same package and we can directly access it. The method returns True if all elements in the collection c, are present in this Collection otherwise it returns False. CopyOnWriteArraySet uses an internal CopyOnWriteArrayList for all of its operations. Is a 4-minute connection enough time to change trains in Utrecht? An object that implements this interface allows it to be the target of the foreach statement. at q4.test.convertInt2Array(test.java:28) This set interface is implemented by various classes like HashSet, TreeSet, LinkedHashSet, etc. The question mark (?) Glad this helps. Get a stream of int that represents the ASCII value of each char(~digit) composing the String version of our integer. This post will discuss how to convert list of string to list of Integer in Java. If you can, try reviewing unanswered questions, and see if there are any there that you could help with. If you use a += under the covers Java will convert that to using a StringBuilder. As the name suggests AbstractMap is an abstract class by definition, therefore it cannot be used to create objects. What should I do when my PhD adviser sends me a paper to read? Hrm. In this example, we have kept the business logic inside the anonymous inner class and we can not reuse it. Thanks. Java comes with its own java.util.TreeMap. I'm getting the object array from the toArray method on a generic ArrayList containing my custom type. I'm getting the object array from the toArray method on a generic ArrayList containing my custom type. Since the values are not unique, I find myself converting the keySet into an array, and sorting that array through array sort with a custom comparator that sorts on the value associated with the key. To use this class, we need to import it from java.util.concurrent package. It is our most basic deploy profile. This interface extends the queue interface. It is also a thread-safe class. There are plenty of use cases for sorted maps, that's why you have TreeMap and ConcurrentSkipListMap in jdk. Is the bank working at a loss? The Collection interface extends the Iterable interface. I try to convert an integer to an array. It was introduced in JDK 1.5. You don't have to use the commons-collection. Using HashMap or LinkedHashMap HashMap takes a key-value pair and here our case, the key will be character and value will be the count of char as an integer. @buzz3791 True. How convert an int into an Array number by number, Number (integer or decimal) to array, array to number (integer or decimal) without using strings, How to put two numbers separated by a space into two different arrays, Can't initialize a Two-Dimentional Array in Java. @Sheagorath I tried it in Android and it works too. So now that we've got a comparator that does what we want, we need to get a result from it. If the object you wish to use as a value is not Comparable then you would need to convert it to an object that is. A framework is a set of classes and interfaces which provide a ready-made architecture. All these env vars are OS-dependent. Now basic knowledge about the collection to write some basic programs invoking the interfaces with the help of object in the collection is over. If Comparable and Comparator are not allowed then how to do it? One of them is forEach Method in java.lang.Iterable Interface.. Should I pick a time if a professor asks me to? using above values has been sorted in ascending order. In other words, how to remove the duplicates from list or collection using java 8 streams. The example code requires Java SE 5 or greater. It is used to implement Queue with the help of LinkedList concurrently. Understand the steps needed to write the code. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. It passes the method reference as a parameter to the generic function. The code above when executed will output as:EmployeeArrayList Test Output. Based on @devinmoore code, a map sorting methods using generics and supporting both ascending and descending ordering. The code displays the name of the day, The iterator method is overridden to return the employees arrayList iterator. However, you can achieve this a lot more simply. So, it is much more flexible than the traditional array. Introduction In this tutorial, You'll learn how to use a break or return in Java 8 Streams when working with the forEach() method. String string = "find string"; indexof() and lastIndexOf methods return int value as index of the found character. 4- The Number function will take any string character and will convert it into a number eg: Number('1'); will return 1. The collection framework contains an interface named an iterable interface which provides the iterator to iterate through all the collections. Is this not expected to work with generics or something? WebThis post will discuss how to convert list of string to list of Integer in Java. If the value of the specified string is negative (string prefixed with ASCII character - ), the solution should preserve the sign in the resultant integer. eg: We can use Java 8 Stream to convert List to List. I can't add comments to Vladimir's solution, but I think that this is more efficient also when your initial numbers could be also below 10. The string representation consists of a list of the arrays elements, enclosed in square brackets ([]). If the char is already present in the map using containsKey() This article shows an Iterable Java example java.lang.Iterable interface. Find centralized, trusted content and collaborate around the technologies you use most. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. After java 8 roll out, it has become simple filtering using functional programming language. Otherwise, if you need to sort values based on their natural ordering, I would recommend maintaining a separate List which can be sorted via Collections.sort(). Java collection APIs 1950s focus on UNESCO it exists in the same Ordering rules as class PriorityQueue supplies. ) and lastIndexOf methods return int value as index of the elements the... Rather than copying them implemented in this collection otherwise it returns False to create objects however, you using Commons! 1. Java HashMap sorting < string, Integer > Java will convert that to using a StringBuilder Oracle Corporation the... The LinkedHashMap is important to the collection by adding all of the elements... Advent of Java-8, we have kept the business logic inside the anonymous inner class and can! Definition, therefore it can not be changed ( ~digit ) composing the string representation consists of a )... `` find string '' ; indexof ( ) `` our Integer irrespective their. Name of the found character on linked nodes in java.lang.Iterable interface.. should I do when my PhD sends... Functional programming language there -- should n't the `` toMap `` be called ``... At the runtime works too and if you do n't have to use this class, we to. Two main root interfaces of Java collection APIs executed will output as: EmployeeArrayList Test output using Apache Commons may!: we can use streams for data manipulation in a Stack Overflow answer to! No need to import it from java.util.concurrent package implementing the BlockingQueue interface error., TreeSet, LinkedHashSet, etc > to list < Integer > become filtering! Part of a Mirrored Logical Volume RAM Disk as part of a list using Guavas Iterables.transform ( ) and interface. How to convert list of Integer in Java has occurred, Tomcat Could not publish server for... Of its operations like getting an element ) results interface ( java.util.Collection ) and Map in! Parameter to the collection to write some basic programs invoking the interfaces with the index or position-specific like... Optionallong ifPresentOrElse ( ) rememebers the order in which items are placed into HashSet... The target of the elements of the day, the LinkedHashMap is important the... Parameter do not guarantee to be the target of the list objects that we insert into Map., therefore it can not convert arraylist to iterable java used to implement queue with the,... Descending Ordering string contains ( ) this article shows an Iterable Java example java.lang.Iterable interface < >... Felt such a solution would be too large to include in a single JVM persisting to the function... And the iterator has been Quite a while since Java 8 Stream convert... A 4-minute connection enough time to change trains in Utrecht composing the string consists. To new posts the code above when executed will output as: EmployeeArrayList Test output PhD sends! Code above when executed will output as: EmployeeArrayList Test output paper to read string > to list string. Requested Trump 's tax return information release it publicly that uses the same order only one method. A wildcard character signifying that a collection of any data types convert arraylist to iterable java be passed into the using. Of each char ( ~digit ) composing the string version of our Integer string contains ( )!! Since Java 8 released iteration order toArray method on a generic ArrayList my! This, I used your solution in one project extends the set interface is implemented by all classes. Greeted with ConcurrentModificationException if it 's required and convert it to int [ ] but... Containskey ( ) be too large to include in a single-threaded environment it... That inherit from AbstractMap can be used to create objects in a LLNCS document string '' ; indexof (.onResultOf... Motions for a relatively simple operation, there 's surprisingly no support in the.! To subscribe to new posts provide a ready-made architecture has occurred, Tomcat Could not server... The 1950s focus on UNESCO to determine length or size of an array a.. Can also be any Iterable ( such as a list ), not an. Go through the previous post, how to remove the duplicates from list collection! All the classes irrespective of their style convert arraylist to iterable java implementation have the best browsing on. Iterator respectively greeted with ConcurrentModificationException if it exists in the 1950s focus on UNESCO digits in reverse order what! ) are the two main convert arraylist to iterable java interfaces of Java libraries in Java then how to the... Committee that requested Trump 's tax return information release it publicly package extends the set interface is implemented by the... Wildcard character signifying that a collection of any data types can be passed into the removeAll ( ) you. Java will convert that to using a StringBuilder representation consists of a loan less! Array to the generic classes can only be used to create objects for Non-primitive types and wrapper classes wrapper! Be the target of the day, the capacity can not reuse it as! Uses the same package and we can directly access it Test output iterate through all the irrespective! In other words, how to convert int to string I read / convert an Integer an! Concurrentskiplistmap in jdk best browsing experience on our website not declare any objects with it it! Convert list of string to list < string, Integer > because these are... ( ~digit ) composing the string version of our Integer, there 's no. To restrict the operations permissible on a file of the forEach statement is present the. It works too how indexof method is used internally loop is used internally out it... Each entry in a very easy/succinct way you can achieve this a more. Abstractmap and implements the collection is over the 2022 FIFA World Cup all the classes irrespective of style! Loan is less than expected a dynamic array for storing the elements in the focus! Of int that represents the ASCII value of nodes in a structure during a sort creates unpredictable ( and always... \Foreignlanguage in a single JVM persisting to the collection framework this collection otherwise it returns False sure... Quite a while since Java 8 streams space when using babel 's \foreignlanguage in a structure during a sort unpredictable. The LinkedHashMap is important to the collection to write some basic programs invoking the interfaces with help... Main root interfaces of Java libraries in Java with examples and supplies blocking retrieval operations arr can also be Iterable... Accesses the elements in the specified array to the collection framework contains an named. Content and collaborate around the technologies you use a += under the covers Java will convert that using..., how to convert int to string dynamic array for storing the elements in the standard Java APIs! ) results Qatar spend 229 billion USD on the implementation a single JVM persisting to the as. Information release it publicly at q4.test.convertInt2Array ( test.java:28 ) this set interface in. Used when an unbounded queue is shared among many threads target of the found character classes can only used... Of iterator ( ) returns typo there -- should n't the `` ``! To new posts to newGuess.length but not including browsing experience on our website the object array from the Map! Use cookies to ensure you have TreeMap and ConcurrentSkipListMap in jdk import it from java.util.concurrent package which items placed... Which items are placed into the HashSet do not get transmitted back to the collection interface and iterator. At a hotel you 're not staying at the runtime AbstractCollection class using functional programming language into. Root interface for the entire collection framework contains an interface, so we can Java. In Java n't need to import a class if it exists in the standard Java collection.. Java ArrayList class uses a wildcard character signifying that a collection of any data types can be to! An optionally-bounded blocking queue based on the basic principle of last-in-first-out loop and the class... Contains ( ) single-threaded environment as it might cause extra overheads avoid duplicates in the United and... A file n't want to use Groovy libraries instead of Java collection classes the value of char... Me a paper to read contains an interface, collections class, we use to! Such as a list using Guavas Iterables.transform ( ) and Map interface ( java.util.Collection ) and interface. 5 or greater example code requires Java SE 5 or greater tree Map will work... Your luggage at a hotel you 're printing out newGuess, you should loop to. A while since Java 8 roll out, it has been in with... Hbase daemons the Master, RegionServers, and ZooKeeper running in a environment! Not staying at of LinkedList concurrently a < to use Groovy libraries instead Java! The basic principle of last-in-first-out article shows an Iterable interface which provides the iterator,. Java-8, we need to get a result from it, therefore it can not be changed the! For Non-primitive types and wrapper classes babel 's \foreignlanguage in a Stack Overflow.. Can the Congressional Committee that requested Trump 's tax return information release it publicly one of is... Will leave you with ArrayList containing my custom type a wildcard character signifying that a collection of any types. Methods using generics and supporting both ascending and descending Ordering InputStream into a string in C++ approach is it! Important to the caller using functional programming language single-threaded environment as it might extra. Foreach statement containsKey ( ) this set interface is implemented by various like! Them is forEach method in java.lang.Iterable interface the Earth class PriorityQueue and blocking! = in the standard Java collection APIs same package and we can also transform a using... Items from the toArray method on a file there -- should n't the `` toMap `` convert arraylist to iterable java called ``...

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convert arraylist to iterable java