THREE people answered this question previously, but did not use my code as the b

ID: 3847867 • Letter: T

Question

THREE people answered this question previously, but did not use my code as the base nor use JavaFX. The most recent one just copied and pasted my code as the answer :( Can someone please help me using the code I made thus far?

Help me using Basic knowledge of java and only JavaFX

I need my calculator to take user input, and do and display Division, multiplication, addition, subtraction, clear, delete a inputted number, and make a number inputted negative or positive.

Here is my code so far. It is only the interface.

package JavaFXPackage;

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.Border;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.FontPosture;
import javafx.scene.text.FontWeight;
import javafx.scene.text.TextAlignment;
import javafx.stage.Stage;

public class MyJavaFX extends Application
{
   @Override // Override the start method in the Application class
   public void start(Stage primaryStage) throws Exception
   {
       double sum = 0;

       // Create a scene and place a button in the scene.
       Pane pane = new Pane();
       pane.setStyle("-fx-background-color: white;");



       Button btnPlusMinus = new Button("+-");
       btnPlusMinus.setLayoutX(0);
       btnPlusMinus.setLayoutY(300);
       btnPlusMinus.setPrefSize(60, 60);
       btnPlusMinus.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnPlusMinus.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnPlusMinus);

       Button btnDecimal = new Button(".");
       btnDecimal.setLayoutX(120);
       btnDecimal.setLayoutY(300);
       btnDecimal.setPrefSize(60, 60);
       btnDecimal.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnDecimal.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnDecimal);

       Button btnEquals = new Button("=");
       btnEquals.setLayoutX(180);
       btnEquals.setLayoutY(300);
       btnEquals.setPrefSize(60, 60);
       btnEquals.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnEquals.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnEquals);

       Button btnAddition = new Button("+");
       btnAddition.setLayoutX(180);
       btnAddition.setLayoutY(240);
       btnAddition.setPrefSize(60, 60);
       btnAddition.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnAddition.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnAddition);

       Button btnSubtraction = new Button("-");
       btnSubtraction.setLayoutX(180);
       btnSubtraction.setLayoutY(180);
       btnSubtraction.setPrefSize(60, 60);
       btnSubtraction.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnSubtraction.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnSubtraction);

       Button btnDivide = new Button("/");
       btnDivide.setLayoutX(180);
       btnDivide.setLayoutY(120);
       btnDivide.setPrefSize(60, 60);
       btnDivide.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnDivide.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnDivide);

       Button btnMultiply = new Button("X");
       btnMultiply.setLayoutX(180);
       btnMultiply.setLayoutY(60);
       btnMultiply.setPrefSize(60, 60);
       btnMultiply.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnMultiply.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnMultiply);

       Button btnZero = new Button("0");
       btnZero.setLayoutX(60);
       btnZero.setLayoutY(300);
       btnZero.setPrefSize(60, 60);
       btnZero.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnZero.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnZero);

       Button btnOne = new Button("1");
       btnOne.setLayoutX(0);
       btnOne.setLayoutY(240);
       btnOne.setPrefSize(60, 60);
       btnOne.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnOne.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnOne);

       Button btnTwo = new Button("2");
       btnTwo.setLayoutX(60);
       btnTwo.setLayoutY(240);
       btnTwo.setPrefSize(60, 60);
       btnTwo.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnTwo.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnTwo);

       Button btnThree = new Button("3");
       btnThree.setLayoutX(120);
       btnThree.setLayoutY(240);
       btnThree.setPrefSize(60, 60);
       btnThree.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnThree.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnThree);

       Button btnFour = new Button("4");
       btnFour.setLayoutX(0);
       btnFour.setLayoutY(180);
       btnFour.setPrefSize(60, 60);
       btnFour.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnFour.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnFour);

       Button btnFive = new Button("5");
       btnFive.setLayoutX(60);
       btnFive.setLayoutY(180);
       btnFive.setPrefSize(60, 60);
       btnFive.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnFive.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnFive);

       Button btnSix = new Button("6");
       btnSix.setLayoutX(120);
       btnSix.setLayoutY(180);
       btnSix.setPrefSize(60, 60);
       btnSix.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnSix.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnSix);

       Button btnSeven = new Button("7");
       btnSeven.setLayoutX(0);
       btnSeven.setLayoutY(120);
       btnSeven.setPrefSize(60, 60);
       btnSeven.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnSeven.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnSeven);

       Button btnEight = new Button("8");
       btnEight.setLayoutX(60);
       btnEight.setLayoutY(120);
       btnEight.setPrefSize(60, 60);
       btnEight.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnEight.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnEight);

       Button btnNine = new Button("9");
       btnNine.setLayoutX(120);
       btnNine.setLayoutY(120);
       btnNine.setPrefSize(60, 60);
       btnNine.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnNine.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnNine);

       Button btnDelete = new Button("<-");
       btnDelete.setLayoutX(120);
       btnDelete.setLayoutY(60);
       btnDelete.setPrefSize(60, 60);
       btnDelete.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnDelete.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnDelete);

       Button btnClear = new Button("C");
       btnClear.setLayoutX(60);
       btnClear.setLayoutY(60);
       btnClear.setPrefSize(60, 60);
       btnClear.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnClear.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnClear);

       Button btnPercent = new Button("%");
       btnPercent.setLayoutX(0);
       btnPercent.setLayoutY(60);
       btnPercent.setPrefSize(60, 60);
       btnPercent.setFont(Font.font("Arial",FontWeight.BOLD,22));
       btnPercent.setStyle("-fx-background-color: #F3F3F3;");
       pane.getChildren().add(btnPercent);

       Label myLabel = new Label("123456");
       myLabel.setFont(Font.font("Courier",FontWeight.BOLD,FontPosture.REGULAR,40));
       myLabel.setAlignment(Pos.BASELINE_RIGHT); // align text to the right side of the label.
       myLabel.setLayoutX(10); // set the x location of the label
       myLabel.setLayoutY(5); // set the y location of the label
       myLabel.setPrefSize(220, 60); // set the width and height of the label
       myLabel.setText("123456789"); // put some numbers into the label
       pane.getChildren().add(myLabel);
       myLabel.setText(Double.toString(sum));

       Scene scene = new Scene(pane,240,360, Color.WHITE);
       primaryStage.setTitle("D's Calculator"); // Set the stage title
       primaryStage.setScene(scene); // Place the scene in the stage
       primaryStage.show(); // Display the stage
   }

   public static void main(String[] args)
   {
       launch(args);
   }
}

Explanation / Answer

Until now you have designed the interface and colored them now i have provided the functioning code for how to run the calculator. The continuation is given below your code.

package JavaFXPackage;

   public static void main(String[] args)
   {
       launch(args);
   }

// Till here it is your code, Try to implement the below mentioned code and join both the codes by choosing your favorable color interface.

private Button createButton(final String s)

{

Button button = makeStandardButton(s);

if (s.matches("[0-9]"))

{

makeNumericButton(s, button);

}

else

{

final ObjectProperty<Op> triggerOp = determineOperand(s);

if (triggerOp.get() != Op.NOOP)

{

makeOperandButton(button, triggerOp);

}

else if ("c".equals(s))

{

makeClearButton(button);

}

else if ("=".equals(s))

{

makeEqualsButton(button);

}

return button;

}

private ObjectProperty<Op> determineOperand(String s)

{

final ObjectProperty<Op> triggerOp = new SimpleObjectProperty<>(Op.NOOP);

switch (s)

{

case "+": triggerOp.set(Op.ADD); break;

case "-": triggerOp.set(Op.SUBTRACT); break;

case "*": triggerOp.set(Op.MULTIPLY); break;

case "/": triggerOp.set(Op.DIVIDE); break;

}

return triggerOp;

}

private void makeOperandButton(Button button, final ObjectProperty<Op> triggerOp)

{

button.setStyle("-fx-base: lightgray;");

button.setOnAction(new EventHandler<ActionEvent>()

{

@Override

public void handle(ActionEvent actionEvent)

{

curOp = triggerOp.get();

}

private Button makeStandardButton(String s)

{

Button button = new Button(s);

button.setStyle("-fx-base: beige;");

accelerators.put(s, button);

button.setMaxSize(Double.MAX_VALUE, Double.MAX_VALUE);

return button;

}

private void makeNumericButton(final String s, Button button)

{

button.setOnAction(new EventHandler<ActionEvent>()

{

@Override

public void handle(ActionEvent actionEvent)

{

if (curOp == Op.NOOP)

{

value.set(value.get() * 10 + Integer.parseInt(s));

}

else

{

stackValue.set(value.get());

value.set(Integer.parseInt(s));

stackOp = curOp;

curOp = Op.NOOP;

}

private void makeClearButton(Button button)

{

button.setStyle("-fx-base: mistyrose;");

button.setOnAction(new EventHandler<ActionEvent>()

{

@Override

public void handle(ActionEvent actionEvent)

{

value.set(0);

}

private void makeEqualsButton(Button button)

{

button.setStyle("-fx-base: ghostwhite;");

button.setOnAction(new EventHandler<ActionEvent>()

{

@Override

public void handle(ActionEvent actionEvent)

{

switch (stackOp)

{

case ADD: value.set(stackValue.get() + value.get()); break;

case SUBTRACT: value.set(stackValue.get() - value.get()); break;

case MULTIPLY: value.set(stackValue.get() * value.get()); break;

case DIVIDE: value.set(stackValue.get() / value.get()); break;

}

private Button createButton(final String s)

{

Button button = makeStandardButton(s);

if (s.matches("[0-9]"))

{

makeNumericButton(s, button);

}

else

{

final ObjectProperty<Op> triggerOp = determineOperand(s);

if (triggerOp.get() != Op.NOOP)

{

makeOperandButton(button, triggerOp);

}

else if ("c".equals(s))

{

makeClearButton(button);

}

else if ("=".equals(s))

{

makeEqualsButton(button);

}

return button;

}

private ObjectProperty<Op> determineOperand(String s)

{

final ObjectProperty<Op> triggerOp = new SimpleObjectProperty<>(Op.NOOP);

switch (s)

{

case "+": triggerOp.set(Op.ADD); break;

case "-": triggerOp.set(Op.SUBTRACT); break;

case "*": triggerOp.set(Op.MULTIPLY); break;

case "/": triggerOp.set(Op.DIVIDE); break;

}

return triggerOp;

}

private void makeOperandButton(Button button, final ObjectProperty<Op> triggerOp)

{

button.setStyle("-fx-base: lightgray;");

button.setOnAction(new EventHandler<ActionEvent>()

{

@Override

public void handle(ActionEvent actionEvent)

{

curOp = triggerOp.get();

}

private Button makeStandardButton(String s)

{

Button button = new Button(s);

button.setStyle("-fx-base: beige;");

accelerators.put(s, button);

button.setMaxSize(Double.MAX_VALUE, Double.MAX_VALUE);

return button;

}

private void makeNumericButton(final String s, Button button)

{

button.setOnAction(new EventHandler<ActionEvent>()

{

@Override

public void handle(ActionEvent actionEvent)

{

if (curOp == Op.NOOP)

{

value.set(value.get() * 10 + Integer.parseInt(s));

}

else

{

stackValue.set(value.get());

value.set(Integer.parseInt(s));

stackOp = curOp;

curOp = Op.NOOP;

}

private void makeClearButton(Button button)

{

button.setStyle("-fx-base: mistyrose;");

button.setOnAction(new EventHandler<ActionEvent>()

{

@Override

public void handle(ActionEvent actionEvent)

{

value.set(0);

}

private void makeEqualsButton(Button button)

{

button.setStyle("-fx-base: ghostwhite;");

button.setOnAction(new EventHandler<ActionEvent>()

{

@Override

public void handle(ActionEvent actionEvent)

{

switch (stackOp)

{

case ADD: value.set(stackValue.get() + value.get()); break;

case SUBTRACT: value.set(stackValue.get() - value.get()); break;

case MULTIPLY: value.set(stackValue.get() * value.get()); break;

case DIVIDE: value.set(stackValue.get() / value.get()); break;

}

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