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Java Articles
Page 50 of 450
The indexOf() method of CopyOnWriteArrayList class in Java
The indexOf() method of the CopyOnWriteArrayList class is used to get the index of the first occurrence of an element. The method has two two forms. Let us see them one by oneindexOf(Object o) methodThe indexOf(Object o) is used to get the index of the first occurrence of an element.The syntax is as followsindexOf(Object o)Here, o is the element for which you want the index. 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 indexOf() method in JavaExampleimport java.util.concurrent.CopyOnWriteArrayList; public class Demo { public static void main(String[] ...
Read MoreArrayBlockingQueue size() Method in Java
To get the number of elements in the queue, use the size() method of the ArrayBlockingQueue class.The syntax is as followsint size()To work with ArrayBlockingQueue class, you need to import the following packageimport java.util.concurrent.ArrayBlockingQueue;The following is an example to implement size() method of Java ArrayBlockingQueue classExampleimport java.util.concurrent.ArrayBlockingQueue; public class Demo { public static void main(String[] args) throws InterruptedException { ArrayBlockingQueue q = new ArrayBlockingQueue(10); q.add(200); q.add(310); q.add(400); ...
Read MoreDoubleStream parallel() method in Java
The parallel() method of the DoubleStream class returns an equivalent stream which is parallel.The syntax is as followsDoubleStream parallel()To use the DoubleStream class in Java, import the following packageimport java.util.stream.DoubleStream;The following is an example to implement DoubleStream parallel() method in JavaExampleimport java.util.*; import java.util.stream.DoubleStream; public class Demo { public static void main(String[] args) { DoubleStream doubleStream = DoubleStream.of(35.8, 14.9, 23.3, 67.8, 89.4, 45.6); System.out.println("Parallel DoubleStream = "); doubleStream.parallel().forEach(System.out::println); } }OutputParallel DoubleStream = 67.8 14.9 23.3 89.4 45.6 35.8
Read MoreArrayBlockingQueue drainTo() Method in Java
The drainTo() method of the ArrayBlockingQueue class removes all available elements from this queue and adds them to the given collection. It returns the number of elements transferred.The syntax is as followsint drainTo(Collection
Read MoreDoubleStream sum() method in Java
The sum() method of the DoubleStream class in Java returns the sum of elements in this stream.The syntax is as followsdouble sum()To use the DoubleStream class in Java, import the following packageimport java.util.stream.DoubleStream;Create DoubleStream and add some elementsDoubleStream doubleStream = DoubleStream.of(23.6, 45.3, 59.6, 60.6, 73.6, 84.7, 94.8);Now, sum the elements of the streamdouble sum = doubleStream.sum(); The following is an example to implement DoubleStream sum() method in JavaExampleimport java.util.*; import java.util.stream.DoubleStream; public class Demo { public static void main(String[] args) { DoubleStream doubleStream = DoubleStream.of(23.6, 45.3, 59.6, 60.6, 73.6, 84.7, 94.8); ...
Read MoreDoubleStream 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); ...
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