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Object Oriented Programming Articles
Page 244 of 589
LongStream mapToInt() method in Java
The mapToInt() method returns an IntStream consisting of the results of applying the given function to the elements of this stream.The syntax is as followsmapToInt(LongToIntFunction mapper)Here, the parameter mapper is the stateless function applied to each element.Declare LongStream and add some elementsLongStream longStream = LongStream.of(1000L, 13000L, 18000L);Now, use the IntStream and mapToInt()IntStream intStream = longStream.mapToInt(val -> (int) val);The following is an example to implement LongStream mapToInt() in JavaExampleimport java.util.*; import java.util.stream.IntStream; import java.util.stream.LongStream; public class Demo { public static void main(String[] args) { LongStream longStream = LongStream.of(1000L, 13000L, 18000L); IntStream intStream = longStream.mapToInt(val ...
Read MoreCollectors minBy() method in Java 8
The minBy() method of the Collectors class in Java 8 returns a Collector that produces the minimum element according to a given Comparator, described as an OptionalThe syntax is as followsstatic Collector
Read MoreStringJoiner setEmptyValue() method in Java 8
The setEmptyValue() method of the StringJoiner class in Java 8 sets the sequence of characters. These characters are to be used when determining the string representation of this StringJoiner and when it is empty. That would be none of the elements have been added.The syntax is as followspublic StringJoiner setEmptyValue(CharSequence emptyVal)Here, emptyVal are the characters to return as the value of an empty StringJoinerTo work with the StringJoiner in Java 8, import the following package.import java.util.StringJoiner;The following is an example to implement StringJoiner setEmptyValue() method in Java:Exampleimport java.util.StringJoiner; public class Demo { public static void main(String[] args) { ...
Read MoreWhat is AbstractCollection class in Java?
The AbstractCollection class provides an implementation of the Collection interface. This is done to minimize the effort in the implementation of this interface.For an unmodifiable collectionExtend this class and provide implementations for the iterator and size methods.For modifiable collectionAdditionally override the add() method of the class. The iterator method returns the iterator and it must implement the remove() method.The syntax is as follows.public abstract class AbstractCollection extends Object implements CollectionHere, Object is the root of the class hierarchy and Collection is a group of objects.To work with AbstractCollection class in Java, import the following package.import java.util.AbstractCollection;Let us now see an ...
Read MoreCollectors partitioningBy() method in Java 8
The partioningBy() method returns a Collector that partitions the input elements according to a Predicate, and organizes them into a Map.The syntax is as follows.static Collector partitioningBy(Predicate
Read MoreWhat is StringJoiner class in Java 8?
The StringJoiner class in Java 8 constructs a sequence of characters. This sequence is separated by a delimiter and optionally starting with a supplied prefix and ending with a supplied suffix.The following are the constructors of the StringJoiner class:StringJoiner(CharSequence delimiter): This constructor constructs a StringJoiner with no characters in it and with no prefix or suffix. It used the copy of the supplied delimiter.StringJoiner(CharSequence delimiter, CharSequence prefix, CharSequence suffix) This constructor constructs a StringJoiner with no characters in it. It uses the copies of the supplied prefix, delimiter and suffix.The syntax is as follows:public final class StringJoiner extends ObjectHere, class ...
Read MoreThe add() method in Java Stream.Builder
Use the add() method to insert elements in the Stream.Builder. The element to be added is a parameter for the add().The following is the syntax:default Stream.Builder add(T t)Here, t is the element to be added.Import the following package for the Stream.Builder class in Java:import java.util.stream.Stream;At first, create Stream.Builder:Stream.Builder builder = Stream.builder();Now, add elements using add() method:builder.add("This"); builder.add("is"); builder.add("it!");Here is an example displaying how to implement add() method of Stream.Builder in Java:Exampleimport java.util.stream.Stream; public class Demo { public static void main(String[] args) { Stream.Builder builder = Stream.builder(); builder.add("This"); builder.add("is"); ...
Read MoreThe accept() method in Java Stream.Builder
Add an element to the stream using the accept() method of Java Stream.Builder.The following is the syntax:void accept(T t)Here, t is the argument to be inserted.Import the following package for the Stream.Builder class in Java:import java.util.stream.Stream;First, declare a Stream.Builder:Stream.Builder builder = Stream.builder();Now, use the accept() method:builder.accept("Demo"); builder.accept("Text");The following is an example displaying how to implement accept() method of Stream.Builder in Java:Exampleimport java.util.stream.Stream; public class Demo { public static void main(String[] args){ Stream.Builder builder = Stream.builder(); builder.accept("Demo"); builder.accept("Text"); Stream str = builder.build(); str.forEach(System.out::println); } ...
Read MoreConvert Character Array to IntStream in Java
Let’s say the following is our character array:Character arr[] = { 'V', 'e', 'h', 'i', 'c', 'l' , 'e' };To convert the above character array to IntStreamIntStream stream = Stream.of(arr).flatMapToInt(IntStream::of);We have used the flatMapToInt() method for this.The following is an example to convert character array to IntStream in Java:Exampleimport java.util.stream.*; public class Main { public static void main(String[] args) { Character arr[] = { 'V', 'e', 'h', 'i', 'c', 'l' , 'e' }; System.out.println("The character array = "); for (char value : arr) { System.out.println("Value = ...
Read MoreConvert String to IntStream in Java
If you have a string and you want to convert it into IntStream with ASCII values, then it can be easily achieved using the below code.To work with IntStream class, you need to import the following package:import java.util.stream.IntStream;Let’s say the following is our string:String str = "Benz";Convert the above string to IntStream:IntStream stream = str.chars();The following is an example to convert String to IntStream in Java:Exampleimport java.util.stream.IntStream; public class Demo { public static void main(String[] args) { String str = "Benz"; System.out.println("String to be converted = " + str); System.out.println("String ...
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