Btukfyl

Sorry guys, I am currently learning java.

I had a question that is how to get access to my local variable?

because I am trying to create a class to implements MouseEvent.
I want to change the property of Line.
but I declare my line in a scope.
which not allow me to change the property of the line.

here is my code

package dotgame;



import javafx.application.Application;

import javafx.event.ActionEvent;

import javafx.event.EventHandler;

import javafx.scene.input.MouseEvent;

import javafx.geometry.Pos;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.layout.StackPane;

import javafx.scene.layout.Pane;

import javafx.stage.Stage;

import javafx.scene.shape.Circle;

import javafx.scene.paint.Color;

import javafx.scene.shape.Line;

import javafx.scene.Group;

import javafx.scene.layout.GridPane;



public class Dotgame extends Application {



@Override

public void start(Stage primaryStage)

{



    //creating array of circles;

   Circle circle=new Circle[9];

   int cCount=0; //for increment the circle index;

   Line  line=new Line[12];









       //assign the lines

       line[0]=new Line(100,100,200,100);

       line[1]=new Line(200,100,300,100);

       line[2]=new Line(100,200,200,200);

       line[3]=new Line(200,200,300,200);

       line[4]=new Line(100,300,200,300);

       line[5]=new Line(200,300,300,300);

       line[6]=new Line(100,100,100,200);

       line[7]=new Line(100,200,100,300);

       line[8]=new Line(200,100,200,200);

       line[9]=new Line(200,200,200,300);

       line[10]=new Line(300,100,300,200);

       line[11]=new Line(300,200,300,300);



       //set line to be invisible

       line[0].setVisible(false);

       line[1].setVisible(false);

       line[2].setVisible(false);

       line[3].setVisible(false);

       line[4].setVisible(false);

       line[5].setVisible(false);

       line[6].setVisible(false);

       line[7].setVisible(false);

       line[8].setVisible(false);

       line[9].setVisible(false);

       line[10].setVisible(false);

       line[11].setVisible(false);









       //assign the size of circles;

    for(int i=0;i<9;i++)

    {

        circle[i]=new Circle(10);

    }



    //assign the X,Y of the circles;

    for(int i=100;i<400;i+=100)

    {

        for(int j=100;j<400;j+=100)

        {

            circle[cCount].setTranslateX(i);

            circle[cCount].setTranslateY(j);



            cCount++;



        }



    }





    //start the game

    for(int i=0;i<12;i++)

    {





    }



           //node for line

    Group lineGroup=new Group();

    lineGroup.getChildren().addAll(line);



    Group circleGroup = new Group();

    circleGroup.getChildren().addAll(circle);



    StackPane root=new StackPane();       

    root.getChildren().addAll(lineGroup,circleGroup);  













    Scene scene = new Scene(root, 500, 500);





    primaryStage.setTitle("Hello World!");

    primaryStage.setScene(scene);

    primaryStage.show();

}



/**

 * @param args the command line arguments

 */

public static void main(String args) {

    launch(args);

}





class VisibleLine implements EventHandler<MouseEvent>

{

    @Override

    public void handle(MouseEvent e)

    {

        line.setVisible(true);   //the problem is here. I couldnt change the line ,  because line is local varibale.

    }

}

Two options :

1. Define it as static : static Line line=new Line[12];



2. 
   

   You can initialize it as a member variable in the class

   
   
   

   public class Dotgame extends Application {
   
      Line  line=new Line[12];
   
   
   
      // rest of the code
   
   }
   
   

   
   

In both options the visibility of line is seen throughout the class.