DoubleConsumer is a functional interface from java.util.function package. This functional interface accepts a single double-valued argument as input and produces no output. This interface can be used as an assignment target for a lambda expression or method reference. DoubleConsumer contains one abstract method: accept() and one default method: andThen().Syntax@FunctionalInterface public interface DoubleConsumer {    void ... Read More

LongConsumer is a in-built functional interface from java.util.function package. This interface can accept a single long-valued argument as input and doesn't produce any output. It can also be used as the assignment target for a lambda expression or method reference and contains one abstract method: accept() and one default method: andThen().Syntax@FunctionalInterface public interface LongConsumerExample-1import java.util.function.LongConsumer; ... Read More

IntUnaryOperator represents a functional interface that takes an int value and returns another int value. It is defined in java.util.function package and used as an assignment target for a lambda expression or method reference. It contains one abstract method: applyAsInt(), two default methods: compose(), andThen() and one static method: identity().Syntax@FunctionalInterface public interface IntUnaryOperatorExampleimport java.util.function.IntUnaryOperator; public class IntUnaryOperatorLambdaTest1 ... Read More

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 ... Read More

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); ... Read More

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, ... Read More

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 ... Read More

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; ... Read More

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(); ... Read More

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 ... Read More