CODEWITHSUNDEEP
javajavafx
Peter Anson
Peter Anson

Reputation: 39

How to split JavaFX Nodes on Class files if Stage needs to be invoked from Main class?

I really like that I can call classes/objects from main method. This way I don't have whole code in main method (that wouldn't really feel like object oriented programming).

Now I have a simple code that draws a line using JavaFX. The line is a node, which is inside scene. But it's all in the main method.

My main class is called Example. It contains whole code

I tried:

public static LineClass extends Example

Then I did put appropriate code there. Compiler didn't let me compile it because launch() needs to be invoked from main method. I then did what compiler asked me to do, but it would just find more errors.

My code (when it was working):

import javafx.application.Application; 
import javafx.scene.Group; 
import javafx.scene.Scene; 
import javafx.scene.shape.Line; 
import javafx.stage.Stage;  

public class DrawingLine extends Application{ 
   @Override 
   public void start(Stage stage) { 
      //Creating a line object 
      Line line = new Line(); 

      //Setting the properties to a line 
      line.setStartX(100.0); 
      line.setStartY(150.0); 
      line.setEndX(500.0); 
      line.setEndY(150.0); 

      //Creating a Group 
      Group root = new Group(line); 

      //Creating a Scene 
      Scene scene = new Scene(root, 600, 300); 

      //Setting title to the scene 
      stage.setTitle("Sample application"); 

      //Adding the scene to the stage 
      stage.setScene(scene); 

      //Displaying the contents of a scene 
      stage.show(); 
   }      
   public static void main(String args[]){ 
      launch(args); 
   } 
}

How to split code for more classes (assuming each class has its own .class file)? My aim is to have the JavaFX code (graphics) for Line object/node in different .class file instead of having all that code in main method to avoid mess. Thanks in advance.

Upvotes: 0

Views: 433

Answers (1)

James_D
James_D

Reputation: 209553

Just create another class with the functionality you need, and instantiate it from start().

import javafx.scene.Group ;
import javafx.scene.Parent ;
import javafx.scene.shape.Line ;

public class LineClass {

    private final Group root ;

    public LineClass() {

        //Creating a line object 
        Line line = new Line(); 

        //Setting the properties to a line 
        line.setStartX(100.0); 
        line.setStartY(150.0); 
        line.setEndX(500.0); 
        line.setEndY(150.0); 

        root = new Group(line); 
    }

    public Parent getView() {
        return root ;
    }
}

and then

import javafx.application.Application ;
import javafx.scene.stage.Stage ;
import javafx.scene.Scene ; 

public class DrawingLine extends Application{ 
   @Override 
   public void start(Stage stage) { 

      LineClass lc = new LineClass();

      //Creating a Scene 
      Scene scene = new Scene(lc.getView(), 600, 300); 

      //Setting title to the scene 
      stage.setTitle("Sample application"); 

      //Adding the scene to the stage 
      stage.setScene(scene); 

      //Displaying the contents of a scene 
      stage.show(); 
   }      
   public static void main(String args[]){ 
      launch(args); 
   } 
}

Upvotes: 1

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