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Java Articles
Page 53 of 450
The addIfAbsent() method of CopyOnWriteArrayList in Java
The addIfAbsent() method appends the element if it is not in the list. If the element is already in the list, then FALSE is returned.The syntax is as follows.public boolean addIfAbsent(E ele)Here, ele is the element to be added to this list, if it is not already in the list.To work with CopyOnWriteArrayList class, you need to import the following package.import java.util.concurrent.CopyOnWriteArrayList;The following is an example to implement CopyOnWriteArrayList class addIfAbsent() method in Java.Exampleimport java.util.concurrent.CopyOnWriteArrayList; public class Demo { public static void main(String[] args) { CopyOnWriteArrayList arrList = new CopyOnWriteArrayList(); arrList.add(30); arrList.add(40); arrList.add(60); ...
Read MoreStringJoiner add() method in Java 8
The add() method of the StringJoiner class is used in Java 8 to add a copy of the given CharSequence value as the next element of the StringJoiner value. If the new element ele is null, then the value null gets added.The syntax is as follows −public StringJoiner add(CharSequence ele)Here, the parameter ele is the element to be added, whereas, CharSequence is a readable sequence of char values.To work with the StringJoiner in Java 8, import the following package −import java.util.StringJoiner;We will first create a StringJoiner and set the delimeter −StringJoiner strJoin = new StringJoiner(", ")Use the add() method to ...
Read MoreIntStream filter() method in Java
The filter() method of the IntStream class in Java returns a stream consisting of the elements of this stream that match the given predicate.The syntax is as follows −IntStream filter(IntPredicate predicate)Here, the predicate parameter is a stateless predicate to apply to each element to determine if it should be included. The IntPredicate above is the predicate of one int-valued argument.Create an IntStream and add elements −IntStream intStream = IntStream.of(20, 34, 45, 67, 89, 100);Now, set a condition and filter stream elements based on it using the filter() method −intStream.filter(a -> a < 50).The following is an example to implement IntStream ...
Read MoreLongStream of() method in Java
The LongStream class in Java the following two forms of the of() method.The following of() method returns a sequential LongStream containing a single element. Here is the syntaxstatic LongStream of(long t)Here, parameter t is the single element.The following of() method returns a sequential ordered stream whose elements are the specified values.static LongStream of(long… values)Here, the parameter values are the elements of the new stream.To use the LongStream class in Java, import the following package.import java.util.stream.LongStream;The following is an example to implement LongStream of() method in Java.Exampleimport java.util.stream.LongStream; public class Demo { public static void main(String[] args) { ...
Read MoreDoubleStream allMatch() method in Java
The allMatch() method in the DoubleStream class returns whether all elements of this stream match the provided predicate.The syntax is as follows −boolean allMatch(DoublePredicate predicate)Here, the argument predicate is a stateless predicate to apply to elements of this stream. The DoublePredicate is a predicate of one double-valued argument.To use the DoubleStream class in Java, import the following package −import java.util.stream.DoubleStream;Create DoubleStream and add some elements −DoubleStream doubleStream = DoubleStream.of(15.8, 28.7, 35.7, 48.1, 78.9);Now, check whether the condition is TRUE for elements of the stream −boolean res = doubleStream.allMatch(num -> num > 10); The following is an example to implement DoubleStream ...
Read MoreCollectors counting() method in Java 8
The counting() method of the Java 8 Collectors class returns a Collector accepting elements of type T that counts the number of input elements.The syntax is as follows −static Collector counting()Here, the parameter −T − type of input elementsLong − This class value of the primitive type long in an objectTo work with Collectors class in Java, import the following package −import java.util.stream.Collectors;The following is an example to implement counting() method in Java 8 −Exampleimport java.util.stream.Collectors; import java.util.stream.Stream; public class Demo { public static void main(String[] args) { Stream stream = Stream.of("25", "50", "75", ...
Read MoreIntStream mapToDouble() method in Java
The mapToDouble() method returns a DoubleStream consisting of the results of applying the given function to the elements of this stream.The syntax is as follows.DoubleStream mapToDouble(IntToDoubleFunction mapper)Here, the parameter mapper is the stateless function applied to each element.Create an IntStream with some elements.IntStream intStream = IntStream.of(5, 20, 25, 45, 60, 75, 85, 90);Now, use the mapToDouble() method to return a DoubleStream.DoubleStream doubleStream = intStream.mapToDouble(val -> (double) val);The following is an example to implement IntStream mapToDouble() method in Java.Exampleimport java.util.*; import java.util.stream.IntStream; import java.util.stream.DoubleStream; public class Demo { public static void main(String[] args) { IntStream intStream = ...
Read MoreIntStream toArray() method in Java
The toArray() method returns an array containing the elements of this stream.Set the elements in the stream with the IntStream class of() method.IntStream stream = IntStream.of(20, 40, 60, 70, 100, 120, 140);Now, display an array with the elements of this stream using the toArray() method.int[] myArr = stream.toArray();The following is the syntax.int[] toArray()The following is an example to implement IntStream toArray() method in Java.Exampleimport java.util.*; import java.util.stream.IntStream; public class Demo { public static void main(String[] args) { IntStream stream = IntStream.of(20, 40, 60, 70, 100, 120, 140); int[] myArr = stream.toArray(); System.out.println(Arrays.toString(myArr)); } }Output[20, 40, 60, 70, 100, 120, 140]
Read MoreCollectors.joining() method in Java 8
The joining() method of the Collectors class in Java 8 returns a Collector that concatenates the input elements into a String, in encounter order.The syntax is as follows −public static Collector joining()Here, CharSequence is a readable sequence of char values, whereas String class represents character strings.To work with Collectors class in Java, import the following package −import java.util.stream.Collectors;The following is an example to implement Collectors.joining() method in Java 8 −Exampleimport java.util.stream.Collectors; import java.util.stream.Stream; import java.util.Arrays; import java.util.List; public class Demo { public static void main(String[] args) { List list = ...
Read MoreIntStream boxed() method in Java
The boxed() method of the IntStream class returns a Stream consisting of the elements of this stream, each boxed to an Integer.The syntax is as follows.Stream boxed()At first, create an IntStreamIntStream intStream = IntStream.range(20, 30);Now, use the boxed() method to return a Stream consisting of the elements of this stream, each boxed to an Integer.Stream s = intStream.boxed();The following is an example to implement IntStream boxed() method in Java.Exampleimport java.util.*; import java.util.stream.Stream; import java.util.stream.IntStream; public class Demo { public static void main(String[] args) { IntStream intStream = IntStream.range(20, 30); Stream s = intStream.boxed(); ...
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