JavaFX Scene Builder Tutorial 34 - Calculator JavaFX

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JavaFX Scene Builder Tutorial 34 Calculator JavaFX Code source here : https://codebyamir.blogspot.com/ @FXML private TextField txt_result; String op =""; long number1; long number2; // First Method public void Number (ActionEvent ae){ String no = ((Button)ae.getSource()).getText(); txt_result.setText(txt_result.getText()+no); } // Second Method public void Operation (ActionEvent ae){ String operation = ((Button)ae.getSource()).getText(); if (!operation.equals("=")){ if(!op.equals("")){ return; } op = operation; number1 = Long.parseLong(txt_result.getText()); txt_result.setText(""); }else { if(op.equals("")){ return; } number2 = Long.parseLong(txt_result.getText()); calculate(number1, number2, op); op=""; } } // 3 Methode public void calculate (long n1, long n2, String op){ switch (op){ case "+" : txt_result.setText(n1 + n2 + "");break; case "-" : txt_result.setText(n1 - n2 + "");break; case "*" : txt_result.setText(n1 * n2 + "");break; case "/" : if (n2 == 0){ txt_result.setText("0");break; } txt_result.setText(n1/n2+ "");break; } } Libraries Importing : import java.net.URL; import java.util.ResourceBundle; import javafx.event.ActionEvent; import javafx.fxml.FXML; import javafx.fxml.Initializable; import javafx.scene.control.Button; import javafx.scene.control.TextField;