At first, let us create a Java Map and initialize −Map map = new HashMap(); map.put(1, "Tom"); map.put(2, "John"); map.put(3, "Kevin"); map.put(4, "Jacob"); map.put(5, "Ryan");Now, convert the Map to List −ArrayList key = new ArrayList(map.keySet()); ArrayList value = new ArrayList(map.values());ExampleFollowing is the program to convert Maps to List in Java ... Read More

Let’s say the following is our string −String str = "My String";Now, convert the above to IntStream −IntStream stream = str.chars();ExampleFollowing is the program to convert String to IntStream in Java −import java.util.stream.IntStream; public class Demo {    public static void main(String[] args) {       String str = ... Read More

Let’s first create an IntStream −IntStream stream = "Ryan".chars();Now, convert this IntStream to String −String str = stream.collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append).toString();ExampleFollowing is the program to convert IntStream to String in Java −import java.util.stream.IntStream; public class Demo {    public static void main(String[] args) {       IntStream stream = "Ryan".chars(); ... Read More

At first create a HashMap −Map map = new HashMap(); map.put("1", "One"); map.put("2", "Two"); map.put("3", "Three"); map.put("4", "Four"); map.put("5", "Five"); map.put("6", "Six");Now, convert the above HashMap to TreeMap −Map treeMap = new TreeMap(); treeMap.putAll(map);ExampleFollowing is the program to convert HashMap to TreeMap in Java −import java.util.*; import java.util.stream.*; public class ... Read More

A boxed array is an array which is defined in the form of an object, instead of the primitives.ExampleFollowing is the program to convert Boxed Array to Stream in Java −import java.util.*; import java.util.stream.*; public class Demo {    public static void main(String args[]) {       String arr[] ... Read More

Iterator in Java is used to traverse each and every element in the collection. Using it, traverse, obtain each element or you can even remove elements from ArrList. To use an iterator to cycle through the contents of a collection, at first obtain an iterator to the start of the ... Read More

At first, let us set an ArrayList of string −ArrayList arrList = new ArrayList(); arrList.add("Bentley"); arrList.add("Audi"); arrList.add("Jaguar"); arrList.add("Cadillac");Now, use toArray() to convert to a string array −int size = arrList.size(); String res[] = arrList.toArray(new String[size]);ExampleFollowing is the program to convert an ArrayList of String to a String array in Java ... Read More

At first, set a list with string values −List myList = new ArrayList( Arrays.asList("One", "Two", "Three", "Four"));Now, use String.join() to set them as a comma separated list −String str = String.join(", ", myList);ExampleFollowing is the program to convert string into comma separated List in Java −import java.util.*; public class Demo ... Read More

At first, create a Set of string −Set setStr = new HashSet(Arrays.asList("osCommerce", "PrestaShop", "Magento", "Wordpres", "Drupal"));Now, use the toArray() method to convert to array of string −String[] arrStr = setStr.toArray(new String[0]);ExampleFollowing is the program to convert Set of String to Array of String in Java −import java.util.Arrays; import java.util.Set; import ... Read More

Let’s say the following is our ArrayList −List arrList = Arrays.asList("John", "Jacob", "Kevin", "Katie", "Nathan");Now, convert this ArrayList to LinkedList using toCollection() −List myList = arrList.stream().collect(Collectors.toCollection(LinkedList::new));ExampleFollowing is the program to convert ArrayList to LinkedList in Java −import java.util.*; import java.util.stream.*; public class Demo {    public static void main(String args[]) ... Read More