仕事でJAVAFXのウィンドウを作る事になりました。

import java.util.List;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;

import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.CheckBox;
import javafx.scene.control.Label;
import javafx.scene.control.ScrollPane;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.layout.Priority;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class test_2 extends Application {
	final static double WIDTH = 400;
	final static double HEIGHT = 700;
	@Override
	public void start(Stage stage) throws Exception {
		stage.setTitle("タイトル");
		BorderPane borderPane = new BorderPane();
		borderPane.setTop(setTitle());
		borderPane.setCenter(setbody());
		
		Button okButton = new Button("OK");
		okButton.setPadding(new Insets(5));	
		Button cancelButton = new Button("cancel");
		cancelButton.setPadding(new Insets(5));

		HBox hbox = new HBox(10);
		hbox.setPadding(new Insets(20));
		Pane bottunspan = new Pane();
		//bottunspan.setPrefHeight(10);
		//bottunspan.setPrefWidth(40);

		hbox.getChildren().addAll(cancelButton ,bottunspan,okButton);
		hbox.setAlignment(Pos.CENTER);
		borderPane.setBottom(hbox);
		
		cancelButton.setOnAction((ActionEvent) ->{
			stage.close();
		});	
		
		okButton.setOnAction((ActionEvent) ->{
			ScrollPane scrollPane = 	(ScrollPane) borderPane.centerProperty().getValue();
			VBox chekboxitems = (VBox) scrollPane.getContent();
			int checkboxClassRow = 2;
			for(int i = 0 ; i < chekboxitems.getChildren().size() ;i++) {
				HBox chekboxitem = (HBox) chekboxitems.getChildren().get(i);
				CheckBox checkBox = (CheckBox) chekboxitem.getChildren().get(checkboxClassRow);
				if(checkBox.isSelected()) {
					System.out.println(chekboxitem.getChildren().get(0));
				}
			}
		});
	

	  Scene scene = new Scene(borderPane,WIDTH,HEIGHT);
	  stage.setResizable(false);
	   

		stage.setScene(scene);
		stage.show();
		

	}
	private static ScrollPane setbody() {
		VBox selectBoxes = new VBox(8);
		String colorGray = "#DDDDDD";
		for(int i = 0 ; i < 20 ; i++) {			
			Label checkBoxLabel = new Label("チェックボックス"+i);
			//checkBoxLabel.setPadding(new Insets(0));
			CheckBox checkBox = new CheckBox();
			//checkBox.setPadding(new Insets(5));
			HBox hbox = new HBox(5);
			hbox.setPrefWidth(WIDTH-20);
			hbox.setPadding(new Insets(5));
			//テキストとチェックボックスを両端にするためのスペース用
			Pane space = new Pane();
			hbox.setHgrow(space, Priority.ALWAYS);
			if(i % 2 == 1) {
				//title.setTextFill(Color.WHITE);
				hbox.setStyle("-fx-background-color:"+colorGray+";");
			}
			hbox.getChildren().addAll(checkBoxLabel,space,checkBox);
			
			selectBoxes.getChildren().add(hbox);
			
		}
		selectBoxes.setPadding(new Insets(5));
		ScrollPane s1 = new ScrollPane(); 
		s1.setContent(selectBoxes);
		s1.setPrefWidth(WIDTH-30);
		return s1;
	
	}
	
	private static HBox setTitle() {
		Label title = new Label("表題");
		//title.setStyle("-fx-font-size: 30px; -fx-background-color:#DDDDDD;");	
		int fontSize = 30;
		title.setStyle("-fx-font-size: "+fontSize+"px;");
		title.setTextFill(Color.WHITE);
		HBox titleBox = new HBox(8);
		titleBox.getChildren().add(title);
		String colorWhite = "#008000";
		titleBox.setStyle("-fx-background-color:" + colorWhite + ";");
		titleBox.setPadding(new Insets(10));
		titleBox.setMinHeight(60);
		titleBox.setMinWidth(WIDTH);
		return titleBox;
	}	
	
	public static void main(String[] args) {
		launch(args);
	}

}