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package sample_calculator; import javafx.application.Application; import javafx.geometry.Insets; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.control.Label; import javafx.scene.layout.GridPane; import javafx.scene.layout.VBox; import javafx.stage.Stage; /**  *  * @author wajid  */ public class Sample_Calculator extends Application {          private final StringBuilder input = new StringBuilder();     private String currentOpt = "";     private double result = 0;               private Label display;         public static void main(String[] args){        launch(args);    }          @Override    public void  start(Stage primaryStage){        primaryStage.setTitle("Material Java Calculator Demo");             ...

  package sample_calculator; import javafx.application.Application; import javafx.geometry.Insets; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.control.Label; import javafx.scene.layout.GridPane; import javafx.scene.layout.VBox; import javafx.stage.Stage; /**  *  * @author wajid  */ public class Sample_Calculator extends Application {     private StringBuilder inputBuffer = new StringBuilder();     private String currentOperator = "";     private double result = 0;     private Label display;     public static void main(String[] args) {         launch(args);     }     @Override     public void start(Stage primaryStage) {         primaryStage.setTitle("Material java Calculator Demo");         GridPane grid = new GridPane();         grid.setPadding(new Insets(10, 10, 10, 10))...