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Programming Articles
Page 2303 of 2547
How to write lambda expression code for SwingUtilities.invokeLater in Java?
An event handling code that runs on a special thread called event dispatch thread(EDT). Most of the code that invokes swing methods also runs on this EDT thread. It is necessary because most of swing object methods do not thread-safe. SwingUtilities is a utility class and has one important static method, invokeLater(). This method can be used to perform a task asynchronously in the AWT event dispatcher thread.Syntaxpublic static void invokeLater(Runnable doRun)Exampleimport javax.swing.*; public class InvokeLAterLambdaTest { public static void main(String[] args) { SwingUtilities.invokeLater(() -> { // ...
Read MoreHow to implement DoubleBinaryOperator using lambda and method reference in Java?
DoubleBinaryOperator is a functional interface defined in java.util.function package. It accepts two parameters of type double as input and produces another double value as a result. DoubleBinaryOperator interface can be used as an assignment target for a lambda expression or method reference and has only one abstract method applyAsDouble().Syntax@FunctionalInterface public interface DoubleBinaryOperator { double applyAsDouble(double left, double right); }Example-1import java.util.function.DoubleBinaryOperator; public class DoubleBinaryOperatorTest { public static void main(String args[]) { // using lambda expression DoubleBinaryOperator sum = (d1, d2) -> d1 + d2; DoubleBinaryOperator mul = (d1, d2) -> d1 * d2; DoubleBinaryOperator div = ...
Read MoreHow to implement the IntPredicate interface using lambda and method reference in Java?
IntPredicate interface is a built-in functional interface defined in java.util.function package. This functional interface accepts one int-valued argument as input and produces a boolean value as an output. This interface is a specialization of the Predicate interface and used as an assignment target for a lambda expression or method reference. It provides only one abstract method, test ().Syntax@FunctionalInterface public interface IntPredicate { boolean test(int value); }Example for Lambda Expressionimport java.util.function.IntPredicate; public class IntPredicateLambdaTest { public static void main(String[] args) { IntPredicate intPredicate = (int input) -> { ...
Read MoreHow to implement ActionEvent using method reference in JavaFX?
The javafx.event package provides a framework for Java FX events. The Event class serves as the base class for JavaFX events and associated with each event is an event source, an event target, and an event type. An ActionEvent widely used when a button is pressed.In the below program, we can implement an ActionEvent for a button by using method reference.Exampleimport javafx.application.*; import javafx.beans.property.*; import javafx.event.*; import javafx.scene.*; import javafx.scene.control.*; import javafx.scene.layout.*; import javafx.stage.*; import javafx.scene.effect.*; public class MethodReferenceJavaFXTest extends Application { private Label label; public static void main(String[] args) { launch(args); } @Override public void start(Stage primaryStage) { ...
Read MoreHow to implement ToDoubleFunction using lambda expression in Java?
ToDoubleFunction is a functional interface defined in java.util.function package. This functional interface expects a parameter as input and produces a double-valued result. It is used as an assignment target for a lambda expression or method reference. ToDoubleFunction interface contains only one abstract method, applyAsDouble().Syntax@FunctionalInterface public interface ToDoubleFunction { double applyAsDouble(T value); }Example-1import java.util.function.ToDoubleFunction; public class ToDoubleFunctionTest1 { public static void main(String args[]) { ToDoubleFunction strLength = s -> s.length(); // lambda expression System.out.println("The length of a given String ...
Read MorePerl vs Java
JavaJava is an object oriented programming language as well as a computing platform.It is safe, quick and reliable.The code in Java is first converted into bytecode and then executed using a JVM (Java Virtual Machine).The java program that is converted into bytecode is stored with the help of the extension ‘.class’.Java doesn’t give any specific way in which associative arrays could be stored, instead there are implementations of various hash functions.Java programs that need to be run are stored with the extension ‘.java’.Java is a statically typed language, i.e type checking is performed during compile-time (not run-time).Single line comments in ...
Read MorePackage Imports in JShell of Java 9
In general, 10 packages are imported using the JShell.The following command shows the packages that were imported by default.jshell> /importOutputimport java.io.* import java.math.* import java.net.* import java.nio.file* import java.sql.* import java.util.* import java.util.regex* import java.util.function* import java.util.prefs* import java.util.stream.*Importing a specific package using JShelljshell> import java.util.*;
Read MoreHow to implement the Runnable interface using lambda expression in Java?
The Runnable interface is a functional interface defined in java.lang package. This interface contains a single abstract method, run() with no arguments. When an object of a class implementing this interface used to create a thread, then run() method has invoked in a thread that executes separately.Syntax@FunctionalInterface public interface Runnable { void run(); }In the below example, we can implement a Runnable interface by using an anonymous class and lambda expression.Examplepublic class RunnableLambdaTest { public static void main(String[] args) { Runnable r1 = new Runnable() { ...
Read MoreHow to implement JavaFX event handling using lambda in Java?
JavaFX Button class provides the setOnAction() method that can be used to set an action for the button click event. An EventHandler is a functional interface and holds only one method is the handle() method.Syntax@FunctionalInterface public interface EventHandler extends EventListenerIn the below example, we can able to implement event handling of JavaFX by using a lambda expression.Exampleimport javafx.application.*; import javafx.beans.property.*; import javafx.event.*; import javafx.scene.*; import javafx.scene.control.*; import javafx.scene.layout.*; import javafx.stage.*; public class LambdaWithJavaFxTest extends Application { public static void main(String[] args) { Application.launch(args); } @Override public void start(Stage stage) throws Exception { ...
Read MoreHow to implement DoubleFunction using lambda expression in Java?
The DoubleFunction is a built-in functional interface defined in java.util.function package. This interface accepts one double-valued parameter as input and returns a value of type R. As this is a functional interface, it can be used as an assignment target for a lambda expression or method reference. DoubleFunction interface having only one abstract method, apply().Syntax@FunctionalInterface public interface DoubleFunction { R apply(double value); }Exampleimport java.util.function.DoubleFunction; public class DoubleFunctionTest { public static void main(String[] args) { DoubleFunction getGrade = marks -> { // lambda expression if(marks > 90 && marks 70 && marks 50 && marks
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