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Object Oriented Programming Articles
Page 504 of 589
Convert String into comma separated List in Java
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 MoreConvert Set of String to Array of String in Java
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 MoreProgram to convert ArrayList to LinkedList in Java
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 MoreProgram to convert a Vector to List in Java
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 MoreProgram to convert a Set to Stream in Java using Generics
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 MoreProgram to convert a Map to a Stream in Java
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 MoreThe String in Switch Case in Java
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 MoreStream.distinct() in Java
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 MoreStream.concat() in Java
The concat() method of the Stream class in Java creates a lazily concatenated stream whose elements are all the elements of the first stream followed by all the elements of the second stream. The syntax is as follows −concat(Stream
Read MoreStream.Builder build() in Java
The build() method of the Stream.Builder class builds the stream, transitioning this builder to the built state. The syntax is as follows −Stream build()Following is an example to implement the build() method of the Stream.Builder class −Exampleimport java.util.stream.Stream; public class Demo { public static void main(String[] args) { Stream.Builder builder = Stream.builder(); builder.add("Production"); builder.add("Marketing"); builder.add("Finance"); builder.add("Sales"); builder.add("Operations"); Stream stream = builder.build(); stream.forEach(System.out::println); } }OutputProduction Marketing Finance Sales OperationsExampleLet us see another example of build() ...
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