kmToMilesfx.java

import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.geometry.Pos;
import javafx.geometry.Insets;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.control.Button;
import javafx.event.EventHandler;
import javafx.event.ActionEvent;
/** *  Kilometer Converter application that uses an *  anonymous inner class to create an event handler. */
public class kmToMilesfx extends Application
{   
	// Fields   
	private TextField kiloTextField;   
	private Label resultLabel;  
	public static void main(String[] args)   
	{    
		// Launch the application.   
		launch(args);   
	}  
	@Override   
	public void start(Stage primaryStage)  
	{
		// Create a Label to display a prompt.     
		Label promptLabel = new Label("Enter a distance in kilometers:");    
		
		// Create a TextField for input.     
		kiloTextField = new TextField();    
		
		// Create a Button to perform the conversion.     
		Button calcButton = new Button("Convert");    
		
		// Create an event handler.     
		calcButton.setOnAction(new EventHandler<ActionEvent>()    
		{        
			@Override        
			public void handle(ActionEvent event)        
			{
				// Get the kilometers.           
				Double kilometers = Double.parseDouble(kiloTextField.getText());    
				
				// Convert the kilometers to miles.           
				Double miles = kilometers * 0.6214;            
				
				// Display the results.        
				resultLabel.setText(String.format("%,.2f miles", miles));      
			}     
		});
      // Create an empty Label to display the result.      

	resultLabel = new Label();      
	
	// Put the promptLabel and the kiloTextField in an HBox.     
	HBox hbox = new HBox(10, promptLabel, kiloTextField);     
	
	// Put the HBox, calcButton, and resultLabel in a VBox.     
	VBox vbox = new VBox(10, hbox, calcButton, resultLabel);   
	
	// Set the VBox's alignment to center.     
	vbox.setAlignment(Pos.CENTER);     
	
	// Set the VBox's padding to 10 pixels.    
	vbox.setPadding(new Insets(10)); 
	
	// Create a Scene.    
	Scene scene = new Scene(vbox);     
	
	// Add the Scene to the Stage.     
	primaryStage.setScene(scene);     
	
	// Set the stage title.     
	primaryStage.setTitle("Kilometer Converter");    
	
	// Show the window.    
	primaryStage.show();      
	}
}