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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 −import java.util.*; public class Demo { public static void main(String[] args) { ArrayList arrList = new ArrayList(); arrList.add("Bentley"); arrList.add("Audi"); arrList.add("Jaguar"); arrList.add("Cadillac"); arrList.add("Mazda"); arrList.add("Land Rover"); arrList.add("Porsche"); ... 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 { public static void main(String args[]) { List myList = new ArrayList(Arrays.asList("One", "Two", "Three", "Four")); System.out.println("List = " + myList); // comma separated String str = String.join(", ", myList); System.out.println("String (Comma Separated) = " ... 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 java.util.HashSet; public class Demo { public static void main(String[] args) { Set setStr = new HashSet( Arrays.asList("osCommerce", "PrestaShop", "Magento", "Wordpres", "Drupal")); System.out.println("Set of String: " + setStr); String[] arrStr = setStr.toArray(new String[0]); System.out.println("Array ... Read More
If you are having no knowledge of HTML or CSS, and want to create a website, then do not worry, you can easily create a website without writing even a single line of HTML code.Here are some ways to build a website without writing any HTML or line of code:Website BuildersWhen you will buy a website hosting plan, then the hosting company will provide you with free website builder option to easily create a website without even writing a single piece of HTML CodeContent Management SystemsUse Content Management System such as WordPress, Drupal or Joomla to develop a website, without ... 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[]) { List arrList = Arrays.asList("John", "Jacob", "Kevin", "Katie", "Nathan"); System.out.println("ArrayList = " + arrList); List myList = arrList.stream().collect(Collectors.toCollection(LinkedList::new)); System.out.println("LinkedList (ArrayList to LinkedList) = " + myList); } }OutputArrayList = [John, Jacob, Kevin, Katie, Nathan] LinkedList (ArrayList to ... Read More
Let’s say the following is our vector with values −Vector v = new Vector(); v.add("20"); v.add("40"); v.add("60"); v.add("80"); v.add("100");Now, convert the above Vector to List −ListmyList = new ArrayList(v);ExampleFollowing is the program to convert a Vector to List in Java −import java.util.*; public class Demo { public static void main(String[] args) { Vector v = new Vector(); v.add("20"); v.add("40"); v.add("60"); v.add("80"); v.add("100"); v.add("120"); v.add("140"); v.add("160"); v.add("200"); ... Read More
Let’s say the following is our Set −Set set = new HashSet(Arrays.asList(15, 40, 60, 90, 120, 150, 200));Now, create a method to convert the above set to stream.StreamstreamOfInteger = convertSet(set);The method −private static Stream convertSet(Set set) { return set.stream(); }ExampleFollowing is the program to convert a Set to Stream in Java using Generics −import java.util.*; import java.util.stream.*; import java.util.function.*; public class Demo { private static Stream convertSet(Set set) { return set.stream(); } public static void main(String args[]) { Set set = new HashSet(Arrays.asList(15, 40, 60, 90, 120, 150, ... Read More
At first, create a Map and set values −Map map = new HashMap(); map.put(1, "Kevin"); map.put(2, "Ryan"); map.put(3, "Nathan"); map.put(4, "Ricky"); map.put(5, "Shane"); map.put(6, "Adam");Now, convert the Map to Stream −Stream stream = map.entrySet().stream(); System.out.println("Stream (Map to Stream) = "+ Arrays.toString(stream.toArray()));ExampleFollowing is the program to convert a Map to a Stream in Java −import java.util.*; import java.util.stream.*; public class Demo { public static void main(String args[]) { Map map = new HashMap(); map.put(1, "Kevin"); map.put(2, "Ryan"); map.put(3, "Nathan"); map.put(4, "Ricky"); map.put(5, ... Read More
The introduction of Java 7 enhanced the switch case i.e. it support string as well.At first, set a string −String department = "AKD05";Now, use the same string in switch as shown below −switch(department)ExampleNow, check for every string using case as we normally do while using SWITCH CASE. Following is an example to implement String in Switch Case −public class Demo { public static void main(String[] args) { String department = "AKD05"; switch(department) { case "AKD01": System.out.println("Finance"); break; ... Read More
The distinct() method of the stream class returns a stream consisting of the distinct elements of this stream. The syntax is as following −Stream distinct()ExampleFollowing is an example to implement the distinct() method in the Stream class −import java.util.*; public class Demo { public static void main(String[] args) { List list = Arrays.asList(10, 30, 40, 40, 50, 70, 90, 90, 100); System.out.println("List = "+list); System.out.println("Displaying only the distinct elements = "); list.stream().distinct().forEach(System.out::println); } }OutputList = [10, 30, 40, 40, 50, 70, 90, 90, 100] Displaying only ... Read More