MainPage.java

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import java.io.IOException;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

/**
 *
 * @author hp
 */
public class MainPage extends Application {
   
    public void show_mainpage(Stage primaryStage) throws IOException
    {
        Parent root = FXMLLoader.load(getClass().getResource("MainPage.fxml"));
        Scene scene =new Scene(root);
        primaryStage.setTitle("load");
        primaryStage.setScene(scene);
        primaryStage.show();
    }
    
    @Override
    public void start(Stage primaryStage) throws IOException 
    {
        show_mainpage(primaryStage);
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }
    
}