Can't someone help me with this java code? I tryna add more operator such as minus, multiple and divide but I can not .

plz help me with this one.

package application;

import javafx.event.ActionEvent; import javafx.fxml.FXML; import javafx.scene.control.Button; import javafx.scene.control.TextField;

public class calController { double first, second, result; int oper;

@FXML private TextField txtfield;

@FXML private Button one;

@FXML private Button two;

@FXML private Button three;

@FXML private Button four;

@FXML private Button five;

@FXML private Button six;

@FXML private Button seven;

@FXML private Button eight;

@FXML private Button nine;

@FXML private Button zero;

@FXML private Button plus;

@FXML private Button equal;

@FXML private Button multiple;

@FXML private Button minus;

@FXML private Button divide;

///////////////////////////////////////////////////////////////////////////// @FXML void handle(ActionEvent event) { String value=((Button)event.getSource()).getText(); txtfield.setText(txtfield.getText()+value); } @FXML void equalfunction(ActionEvent event) { //plus// second= Double.parseDouble(txtfield.getText()); result= first + second; txtfield.setText(Double.toString(result)); } @FXML void plusfunction(ActionEvent event) { String value = ((Button)event.getSource()).getText(); first = Double.parseDouble(txtfield.getText()); txtfield.setText(""); }

@FXML void minusfunction(ActionEvent event) {

}

@FXML void multiplefunction(ActionEvent event) {

}

@FXML void dividefunction(ActionEvent event) { }

}