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Java Articles
Page 364 of 450
Program 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() ...
Read MoreCalendar Functions in Java
The java.util.calendar class provides the calendar functions in Java. Is an abstract class that provides methods for converting between a specific instant in time and a set of calendar fields such as YEAR, MONTH, DAY_OF_MONTH, HOUR, and so on, and for manipulating the calendar fields, such as getting the date of the next week.Following are the calendar functions in Java −Sr.NoMethod & Description1abstract void add(int field, int amount)This method adds or subtracts the specified amount of time to the given calendar field, based on the calendar's rules.2boolean after(Object when)This method returns whether this Calendar represents a time after the time ...
Read MoreInts toArray() function in Java
The toArray() method of the Ints class returns an array containing each value of collection, converted to a int value in the manner of Number.intValue(). Following is the syntax −public static int[] toArray(Collection
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