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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
	 primaryStage.setTitle("Hello World!");
        Button btn = new Button();
        btn.setText("Say 'Hello World'");
        btn.setOnAction(new EventHandler<ActionEvent>() {
 
            @Override
            public void handle(ActionEvent event) {
                System.out.println("Hello World!");
            }
        });
 
        StackPane root = new StackPane();
        root.getChildren().add(btn);
        primaryStage.setScene(new Scene(root, 300, 250));
        primaryStage.show();
 
		// your code goes here
	}
}

Main.java:12: error: cannot find symbol
	 primaryStage.setTitle("Hello World!");
	 ^
  symbol:   variable primaryStage
  location: class Ideone
Main.java:13: error: cannot find symbol
        Button btn = new Button();
        ^
  symbol:   class Button
  location: class Ideone
Main.java:13: error: cannot find symbol
        Button btn = new Button();
                         ^
  symbol:   class Button
  location: class Ideone
Main.java:15: error: cannot find symbol
        btn.setOnAction(new EventHandler<ActionEvent>() {
                            ^
  symbol:   class EventHandler
  location: class Ideone
Main.java:15: error: cannot find symbol
        btn.setOnAction(new EventHandler<ActionEvent>() {
                                         ^
  symbol:   class ActionEvent
  location: class Ideone
Main.java:23: error: cannot find symbol
        StackPane root = new StackPane();
        ^
  symbol:   class StackPane
  location: class Ideone
Main.java:23: error: cannot find symbol
        StackPane root = new StackPane();
                             ^
  symbol:   class StackPane
  location: class Ideone
Main.java:25: error: cannot find symbol
        primaryStage.setScene(new Scene(root, 300, 250));
                                  ^
  symbol:   class Scene
  location: class Ideone
Main.java:25: error: cannot find symbol
        primaryStage.setScene(new Scene(root, 300, 250));
        ^
  symbol:   variable primaryStage
  location: class Ideone
Main.java:26: error: cannot find symbol
        primaryStage.show();
        ^
  symbol:   variable primaryStage
  location: class Ideone
10 errors

Standard output is empty