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Java Articles
Page 58 of 450
The toArray() method of Java AbstractCollection class
The toArray() method of the AbstractCollection class is used to return the elements in this collection. The elements are returned in the form of an array.The syntax is as followspublic Object[] toArray()To work with AbstractCollection class in Java, import the following packageimport java.util.AbstractCollection;At first, declare AbstractCollection and add some elementsAbstractCollection absCollection = new ArrayList(); absCollection.add("Laptop"); absCollection.add("Tablet"); absCollection.add("Mobile"); absCollection.add("E-Book Reader");Now, use the toArray() method to return the elements in the form of an arrayObject[] myArr = absCollection.toArray();The following is an example to implement AbstractCollection toArray() method in JavaExampleimport java.util.ArrayList; import java.util.AbstractCollection; public class Demo { public static void main(String[] args) ...
Read MoreIntStream parallel() method in Java
The parallel() method of the IntStream class in Java returns an equivalent parallel stream. The method may return itself, either because the stream was already parallel, or because the underlying stream state was modified to be parallel.The syntax is as follows:IntStream parallel()Create an IntStream and you can use the range() method as well to set the range of elements:IntStream intStream = IntStream.range(20, 35);Now, use the parallel() method:intStream.parallel()The following is an example to implement IntStream parallel() method in JavaExampleimport java.util.stream.IntStream; public class Demo { public static void main(String[] args) { IntStream intStream = IntStream.range(20, 35); ...
Read MoreLongStream parallel() method in Java
The parallel() method of the LongStream class in Java returns an equivalent stream that is parallel.The syntax is as follows:LongStream parallel()To use the LongStream class in Java, import the following packageExampleimport java.util.stream.LongStream;The following is an example to implement LongStream parallel() method in Java:import java.util.stream.LongStream; public class Demo { public static void main(String[] args) { LongStream longStream = LongStream.range(10L, 20L); System.out.println("Parallel LongStream = "); longStream.parallel().forEach(System.out::println); } }outputParallel LongStream = 16 15 10 17 11 13 12 19 18 14
Read MoreLongStream generate() method in Java
The generate() method of the LongStream class returns an infinite sequential unordered stream where each element is generated by the provided LongSupplier.The syntax is as follows:static LongStream generate(LongSupplier s)Here, s is the LongSupplier for generate elements. The LongSupplier is the supplier of long-valued results.To use the LongStream class in Java, import the following package:import java.util.stream.LongStream;The following is an example to implement LongStream generate() method in Java −Exampleimport java.util.stream.LongStream; public class Demo { public static void main(String[] args){ LongStream longStream = LongStream.generate(() -> { return (long)(Math.random() * 100); }); System.out.println("Unordered ...
Read MoreDoubleStream summaryStatistics() method in Java
The summaryStatistics() method of the DoubleStream class returns a DoubleSummaryStatistics describing various summary data about the elements of this stream. This is a special case of a reduction.The syntax is as followsDoubleSummaryStatistics summaryStatistics()Here, DoubleSummaryStatistics is a state object for collecting statistics such as count, min, max, average, etc. It works with streams. To use the DoubleStream class in Java, import the following packageimport java.util.stream.DoubleStream;First, create a DoubleStream and add some elementsDoubleStream doubleStream = DoubleStream.of(20.5, 35.8, 45.9, 50.8, 80.7);Now, get the statisticsDoubleSummaryStatistics details = doubleStream.summaryStatistics();The following is an example to implement DoubleStream summaryStatistics() methodExampleimport java.util.stream.DoubleStream; import java.util.DoubleSummaryStatistics; public class Demo { ...
Read MoreArrayBlockingQueue add() method in Java
To add elements to the ArrayBlockingQueue class, use the add() method.The syntax is as followsboolean add(E ele)Here, ele is the element to be added to the queue. To work with ArrayBlockingQueue class, you need to import the following packageimport java.util.concurrent.ArrayBlockingQueue;The following is an example to add elements in Java ArrayBlockingQueue classExampleimport java.util.concurrent.ArrayBlockingQueue; public class Demo { public static void main(String[] args) { ArrayBlockingQueue q = new ArrayBlockingQueue(7); q.add(100); q.add(250); q.add(300); q.add(450); q.add(550); q.add(600); q.add(700); System.out.println("ArrayBlockingQueue = " + q); } }OutputArrayBlockingQueue = [100, 250, 300, 450, 550, 600, 700]
Read MoreThe toString() method of Java AbstractCollection class
The toString() method of the AbstractCollection class is used to return the string representation of the elements of this collection.The syntax is as followspublic String toString()To work with AbstractCollection class in Java, import the following packageimport java.util.AbstractCollection;The following is an example to implement AbstractCollection toString() method in JavaExampleimport java.util.ArrayList; import java.util.AbstractCollection; public class Demo { public static void main(String[] args) { AbstractCollection absCollection = new ArrayList(); absCollection.add("HDD"); absCollection.add("Earphone"); absCollection.add("Headphone"); absCollection.add("Card Reader"); absCollection.add("SSD"); absCollection.add("Pen Drive"); System.out.println("Count ...
Read MoreLongStream 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) { ...
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