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Java Articles
Page 50 of 450
DoubleStream noneMatch() method in Java
The noneMatch() method of the DoubleStream class returns true if none of the elements of this stream match the provided predicate.The syntax is as followsboolean noneMatch(DoublePredicate predicate)Here, predicate is a stateless predicate to apply to elements of this stream. To use the DoubleStream class in Java, import the following packageimport java.util.stream.DoubleStream;Create DoubleStream and add some elements to the streamDoubleStream doubleStream = DoubleStream.of(15.8, 28.7, 35.7, 48.1, 78.9);Now, TRUE is returned if none of the element match the conditionboolean res = doubleStream.noneMatch(num -> num > 90); The following is an example to implement DoubleStream noneMatch() method in JavaExampleimport java.util.*; import java.util.stream.DoubleStream; public ...
Read MoreDoubleStream mapToLong() method in Java
The mapToLong() method of the DoubleStream class returns a LongStream consisting of the results of applying the given function to the elements of this stream.The syntax is as followsLongStream mapToLong(DoubleToLongFunction mapper)Here, the parameter mapper is a stateless function to apply to each element. The DoubleToLongFunction here is a function that accepts a double-valued argument and produces a long-valued result.To use the DoubleStream class in Java, import the following packageimport java.util.stream.DoubleStream;Create a DoubleStream and add some elementsDoubleStream doubleStream = DoubleStream.of(30.5, 45.8, 89.3);Now, use the LongStream and set a condition for the stream elementsLongStream longStream = doubleStream.mapToLong(a -> (long)a); The following is ...
Read MoreIntStream rangeClosed() method in Java
The rangeClosed() class in the IntStream class returns a sequential ordered IntStream from startInclusive to endInclusive by an incremental step of 1. This includes both the startInclusive and endInclusive values.The syntax is as followsstatic IntStream rangeClosed(int startInclusive, int endInclusive)Here, startInclusive is the value including the first value and endInclusive is the value indicating the last value. To work with the IntStream class in Java, import the following packageimport java.util.stream.IntStream;The following is an example to implement IntStream rangeClosed() method in JavaExampleimport java.util.stream.IntStream; public class Demo { public static void main(String[] args) { ...
Read MoreIntStream findFirst() method in Java
The findFirst() method in Java returns an OptionalInt describing the first element of this stream. If the stream is empty, an empty OptionalInt is returned.The syntax is as followsOptionalInt findFirst()Here, OptionalInt is a container object which may or may not contain an int value.To work with the IntStream class in Java, import the following packageimport java.util.stream.IntStream;For OptionalInt class, import the following packageimport java.util.OptionalInt;First, create an IntStream and add elementsIntStream intStream = IntStream.of(30, 45, 70, 80, 90, 120);Now, get the first element of this streamOptionalInt res = intStream.findFirst();The following is an example to implement IntStream findFirst() method in JavaExampleimport java.util.OptionalInt; import ...
Read MoreIntStream.Builder build() method in Java
The build() method builds the stream. It transitions the builder to the built state. It returns the built stream. First, add elements to the streamIntStream.Builder builder = IntStream.builder(); builder.add(10); builder.add(25); builder.add(33);Now the stream is in the built phasebuilder.build().forEach(System.out::println);The syntax is as followsIntStream build()The following is an example to implement IntStream.Builder build() method in JavaExampleimport java.util.stream.IntStream; public class Demo { public static void main(String[] args) { IntStream.Builder builder = IntStream.builder(); System.out.println("Elements in the stream..."); builder.add(10); builder.add(25); builder.add(33); builder.add(42); builder.add(55); ...
Read MoreThe listIterator() method of CopyOnWriteArrayList in Java starting at a specified position
The listIterator() method CopyOnWriteArrayList class returns a list iterator over the elements in this list, beginning at the specified position in the list.The syntax is as followspublic ListIterator listIterator(int index)Here, index is the index of the first element to be returned from the list iterator.To work with CopyOnWriteArrayList class, you need to import the following packageimport java.util.concurrent.CopyOnWriteArrayList;The following is an example to implement CopyOnWriteArrayList class listIterator() method in Java. We have set the index as 3, therefore, the list would be iterated from index 3Exampleimport java.util.Iterator; import java.util.ListIterator; import java.util.concurrent.CopyOnWriteArrayList; public class Demo { public static void main(String[] args) ...
Read MoreMonthDay isSupported() Method in Java
It can be checked if a ChronoField is supported by the MonthDay class or not by using the isSupported() method in the MonthDay class in Java. This method requires a single parameter i.e. the ChronoField to check. It returns true if the ChronoField is supported by the MonthDay class and false otherwise.A program that demonstrates this is given as followsExampleimport java.time.*; import java.time.temporal.*; public class Demo { public static void main(String[] args) { MonthDay md = MonthDay.now(); System.out.println("The MonthDay is: " + md); boolean flag = md.isSupported(ChronoField.MONTH_OF_YEAR); ...
Read MoreIntStream map() method in Java
The IntStream map() method returns the new stream consisting of the results of applying the given function to the elements of this stream.The syntax is as followsIntStream map(IntUnaryOperator mapper)Here, mapper parameter is a non-interfering, stateless function to apply to each elementCreate an IntStream and add some elementsIntStream intStream1 = IntStream.of(20, 35, 40, 55, 60);Now, map it with the new IntStream and display the updated stream elements applying the condition in the map() functionIntStream intStream2 = intStream1.map(a -> (a + a));The following is an example to implement IntStream map() method in JavaExampleimport java.util.*; import java.util.stream.IntStream; public class Demo { public ...
Read MoreIntStream flatMap() method in Java
The flatMap() method of the IntStream class returns a stream consisting of the results of replacing each element of this stream with the contents of a mapped stream produced by applying the provided mapping function to each element.The syntax is as followsIntStream flatMap(IntFunction
Read MoreThe contains() method of CopyOnWriteArrayList in Java
The contains() method of the CopyOnWriteArrayList class is used to get the specified element. It returns TRUE if the element is in the List, else FALSE is returned.The syntax is as followsboolean contains(Object ob)Here, ob is the element to be checked for existence. To work with CopyOnWriteArrayList class, you need to import the following packageimport java.util.concurrent.CopyOnWriteArrayList;The following is an example to implement CopyOnWriteArrayList class contains() method in JavaExampleimport java.util.concurrent.CopyOnWriteArrayList; public class Demo { public static void main(String[] args) { CopyOnWriteArrayList arrList = new CopyOnWriteArrayList(); arrList.add(100); arrList.add(250); arrList.add(400); ...
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