Error in code by classes

[rosemadder]

Good. I have now begun studying java programming which includes several classes in which one calls another. But I'm coming across a mistake I can't understand. I've searched similar-effect codes and I can't figure out a clear difference of error. The goal is to create a class that makes a tablet-shaped drawing (Cumprido), and another that draws a grid of these tablets.

In the drawing code I have this:

import javafx.application.*;
import javafx.event.*;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.*;
import javafx.scene.shape.*;
import javafx.embed.swing.*;
import javafx.application.*;
import javafx.scene.text.*;
import java.util.*;
import javafx.scene.paint.Color;
public class Pill  {

private Pane pane;

public void pill(int x, int y, int width, int height, Color leftColor, Color rightColor)

{

Rectangle leftRect= new Rectangle(x,y,width/4,height);

leftRect.setStrokeWidth(0);

leftRect.setFill(leftColor);

pane.getChildren().add(leftRect);
Rectangle rightRect = new Rectangle(x+width/4,y,width/4,height);
rightRect.setStrokeWidth(0);
rightRect.setFill(rightColor);
pane.getChildren().add(rightRect);

Ellipse leftEllipse = new Ellipse(x,y+height/2,width/4,height/2);
leftEllipse.setStrokeWidth(0);
leftEllipse.setFill(leftColor);
pane.getChildren().add(leftEllipse);

Ellipse rightEllipse = new Ellipse(x+width/2,y+height/2,width/4,height/2);
rightEllipse.setStrokeWidth(0);
rightEllipse.setFill(rightColor);
pane.getChildren().add(rightEllipse);

}

} // END class Pill

Which compiles and has already tried to put in a class apart and performs without problem.
Where is the mistake is in this:

import javafx.application.;

import javafx.event.;

import javafx.scene.;

import javafx.scene.control.;

import javafx.scene.layout.;

import javafx.stage.;

import javafx.scene.shape.;

import javafx.embed.swing.;

import javafx.application.;

import javafx.scene.text.;

import java.util.*;

import javafx.scene.paint.Color;

public class Drawing  {

private Pane pane;

private void start(Stage primaryStage)

{

primaryStage.setOnCloseRequest(

e -> Platform.runLater( () -> {Platform.exit(); System.exit(0);} ));
// WRITE YOUR CODE HERE
// TODO    
    // 

https://docs.oracle.com/javase/8/javafx/api/javafx/scene/layout/Pane.html

this.pane = new Pane();

this.pane.setPrefSize(900, 600);

primaryStage.setScene(new Scene(this.pane, Color.WHITE));

primaryStage.show();
Pill pill = new Pill (150,100,300,200,Color.BLACK,Color.GRAY);   //Aqui dá um erro(Constructor Pill cannot be applied to class Pill cannot be applied to given types).
this.pane.getChildren().add(pill);//Aqui da outro erro(No suitable method for add(pill).

this.drawGrid();

} // END start
public void addShape(Shape shape)

{

Platform.runLater(() -> this.pane.getChildren().add(shape));

}
/** execute this method to start the program

executing the code in method start(Stage primaryStage)

*/

public static void start()

{

Drawing drawingApp = new Drawing();

drawingApp.launch();

}

public void launch()

{

// Initialises JavaFX:

new JFXPanel();

// Makes sure JavaFX doesn't exit when first window is closed:

Platform.setImplicitExit(false);

// Runs initialisation on the JavaFX thread:

Platform.runLater(() -> start(new Stage()));

}
public Drawing()

{

super();

}
public void drawGrid(int x, int y, int nLines, int nColumns, int width, int height, Color leftColor, Color rightColor)

{

nLines=3;

nColumns = 4;

for(int i = 300;i<=nLines350;i+=350)

{

for(int j = 200; j <=nColumns250;i+=250)

{

Pill p = new Pill (i,j,width,height,Color.BLACK,Color.GRAY);  // Dá um erro igual ao primeiro.

}

}

}
} // END class Drawing

[charlenef]

The problem of your code is in the class builder call Pill, since there is no constructor that meets what was called in class Drawing. Since a constructor has not been defined with the parameters of the call that is made in this last one, the code cannot compile

A possible solution would be to rename the method public void pill(...) For public Pill(...), staying as follows:

public class Pill  {  
    private Pane pane;
    public Pill(int x, int y, int width, int height, Color leftColor, Color rightColor){
        ...
    }
}

Note that there are still two conceptual problems in your code:

1 - Builder has no return type;

2 - Builder needs to have the same class name (do not forget that Java is case sensitive!).