java - Simplest way to add an image in Javafx? -

i don't understand how add simple image. imported , followed said on page:

http://www.java2s.com/code/java/javafx/loadajpgimagewithimageanduseimageviewtodisplay.htm

javafx code

import javafx.application.application; import javafx.scene.group; import javafx.scene.scene; import javafx.scene.image.image; import javafx.scene.image.imageview; import javafx.scene.layout.vbox; import javafx.stage.stage;  public class test extends application {      @override     public void start(stage stage) {         stage.settitle("html");         stage.setwidth(500);         stage.setheight(500);         scene scene = new scene(new group());         vbox root = new vbox();              final imageview selectedimage = new imageview();            image image1 = new image(test.class.getresourceasstream("c:\\users\\user\\desktop\\x.jpg"));          selectedimage.setimage(image1);          root.getchildren().addall(selectedimage);          scene.setroot(root);          stage.setscene(scene);         stage.show();     }      public static void main(string[] args) {         launch(args);     } } 

error

    @ com.sun.javafx.application.launcherimpl.lambda$launchapplication$156(launcherimpl.java:182)     @ java.lang.thread.run(thread.java:745) caused by: java.lang.nullpointerexception: input stream must not null     @ javafx.scene.image.image.validateinputstream(image.java:1110)     @ javafx.scene.image.image.<init>(image.java:694)     @ prototype.test.start(test.java:23)     @ com.sun.javafx.application.launcherimpl.lambda$launchapplication1$163(launcherimpl.java:863)     @ com.sun.javafx.application.platformimpl.lambda$runandwait$176(platformimpl.java:326)     @ com.sun.javafx.application.platformimpl.lambda$null$174(platformimpl.java:295)     @ java.security.accesscontroller.doprivileged(native method)     @ com.sun.javafx.application.platformimpl.lambda$runlater$175(platformimpl.java:294)     @ com.sun.glass.ui.invokelaterdispatcher$future.run(invokelaterdispatcher.java:95)     @ com.sun.glass.ui.win.winapplication._runloop(native method)     @ com.sun.glass.ui.win.winapplication.lambda$null$149(winapplication.java:191) 

class.getresourceasstream tries load element in classpath. it's not meant load files unless included in classpath. load file outside of classpath, use fileinputstream instead:

image image1 = new image(new fileinputstream("c:\\users\\user\\desktop\\x.jpg")); 

or use image(string) constructor , pass url of file:

image image1 = new image(new file("c:\\users\\user\\desktop\\x.jpg").touri().tourl().toexternalform());