Explanation of Solution
Event handler:
- The event handler is nothing but an object that responds to the events.
- A particular method in the event handler is called if an event source is connected to the event handler. The object of the event is passed as the argument to that method.
- This process is known as event firing.
- The event handler class should implement the “EventHandler” interface.
- This interface is in the package “javafx.event”.
Step 1: Register the event handler for the button using “setOnAction ()” method.
Step 2: Inside this, set the text for the label as “Hello World”.
Statement to register an instance of the class with “myButton” control using lambda expression:
//Register the event handler
myButton.setOnAction(event ->
{
//Set the text
outputLabel.setText("Hello World");
});
Example program:
The statement to register the event handler for “myButton” is highlighted.
//Import required packages
import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.geometry.Insets;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.VBox;
import javafx.scene.control.Label;
import javafx.scene.control.Button;
//Declare the main class
public class Example extends Application
{
//Declare the main method
public static void main(String[] args)
{
// Launch the application...
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Starting Out with Java: From Control Structures through Objects (7th Edition) (What's New in Computer Science)
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