This is not running. can you please help? package testscoregui; import java.util

Question

This is not running. can you please help?

package testscoregui; import java.util.ArrayList; import javafx.application.Application; import javafx.event.ActionEvent; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.control.Label; import javafx.scene.layout.GridPane; import javafx.stage.Stage; import javafx.scene.layout.HBox; import javafx.geometry.Pos; import javafx.geometry.Insets; import javafx.scene.layout.BorderPane; import javafx.scene.control.TextField; public class TestScoreGUI extends Application { private final TextField tfEnterScore = new TextField(); private final TextField tfNumberOfScores = new TextField(); private final TextField tfAverageScore = new TextField(); private final TextField tfBestScore = new TextField(); @Override // override the start method in the application class public void start(Stage primaryStage) { //Create user interface // Create gridpane and add textfields GridPane pane = new GridPane(); pane.setHgap(5); pane.setVgap(5); pane.add(new Label("Enter score:"), 0, 0); pane.add(tfEnterScore, 1, 0); pane.add(new Label("Number of scores:"), 0, 1); pane.add(tfNumberOfScores, 1, 1); pane.add(new Label("Average score:"), 0, 2); pane.add(tfAverageScore, 1, 2); pane.add(new Label("Best score:"), 0, 3); pane.add(tfBestScore, 1, 3); // set properties for gridpane pane.setAlignment(Pos.CENTER); tfEnterScore.setAlignment(Pos.BOTTOM_RIGHT); tfNumberOfScores.setAlignment(Pos.BOTTOM_RIGHT); tfAverageScore.setAlignment(Pos.BOTTOM_RIGHT); tfBestScore.setAlignment(Pos.BOTTOM_RIGHT); tfNumberOfScores.setEditable(false); tfAverageScore.setEditable(false); tfBestScore.setEditable(false); // Create four buttons HBox hBox = new HBox(5); hBox.setSpacing(10); hBox.setAlignment(Pos.CENTER); hBox.setPadding(new Insets(5)); Button btEnterScore = new Button("Enter score"); Button btClear = new Button("Clear"); Button btExit = new Button("Exit"); hBox.getChildren().addAll(btEnterScore, btClear, btExit); // Create borderpane and align hbox and pane in BorderPane borderPane = new BorderPane(); borderPane.setCenter(pane); borderPane.setBottom(hBox); // Create a scene and place borderpane in the stage Scene scene = new Scene(borderPane, 300, 200); primaryStage.setTitle("Test Scores"); primaryStage.setScene(scene); primaryStage.show(); btEnterScore.setOnAction(( ActionEvent e) -> { // Create array to store scores as elements double score; score = Double.parseDouble(tfEnterScore.getText()); ArrayList list = new ArrayList<>(); for(int i = 1; i <= score; i++) list.add(i); double sum = 0; for (int i = 0 ; i < list.size(); i++) sum += list(i); // Display results tfNumberOfScores.setText(String.format("", list.size())); tfAverageScore.setText(String.format("", sum / list.size())); tfBestScore.setText(String.format("", java.util.Collections.max(list))); }); btClear.setOnAction(e -> { //list.clear(); }); btExit.setOnAction(e -> { System.exit(0); }); } public static void main(String[] args) { Application.launch(args); } }

Explanation / Answer

Here is the code works perfectly

package testscoregui;
import java.util.ArrayList;
import java.awt.*;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;
import javafx.scene.layout.HBox;
import javafx.geometry.Pos;
import javafx.geometry.Insets;
import javafx.scene.layout.BorderPane;
import javafx.scene.control.TextField;
public class TestScoreGUI extends Application implements ActionListener{
   private final TextField tfEnterScore = new TextField();
   private final TextField tfNumberOfScores = new TextField();
   private final TextField tfAverageScore = new TextField();
   private final TextField tfBestScore = new TextField();
   @Override // override the start method in the application class
   public void start(Stage primaryStage) {
       //Create user interface
       // Create gridpane and add textfields
       GridPane pane = new GridPane();
       pane.setHgap(5);
       pane.setVgap(5);
       pane.add(new Label("Enter score:"), 0, 0);
       pane.add(tfEnterScore, 1, 0);
       pane.add(new Label("Number of scores:"), 0, 1);
       pane.add(tfNumberOfScores, 1, 1);
       pane.add(new Label("Average score:"), 0, 2);
       pane.add(tfAverageScore, 1, 2);
       pane.add(new Label("Best score:"), 0, 3);
       pane.add(tfBestScore, 1, 3);
       // set properties for gridpane
       pane.setAlignment(Pos.CENTER);
       tfEnterScore.setAlignment(Pos.BOTTOM_RIGHT);
       tfNumberOfScores.setAlignment(Pos.BOTTOM_RIGHT);
       tfAverageScore.setAlignment(Pos.BOTTOM_RIGHT);
       tfBestScore.setAlignment(Pos.BOTTOM_RIGHT);
       tfNumberOfScores.setEditable(false);
       tfAverageScore.setEditable(false);
       tfBestScore.setEditable(false);
       // Create four buttons
       HBox hBox = new HBox(5);
       hBox.setSpacing(10);
       hBox.setAlignment(Pos.CENTER);
       hBox.setPadding(new Insets(5));
       Button btEnterScore = new Button("Enter score");
       Button btClear = new Button("Clear");
       Button btExit = new Button("Exit");
       hBox.getChildren().addAll(btEnterScore, btClear, btExit);
       // Create borderpane and align hbox and pane in
       BorderPane borderPane = new BorderPane();
       borderPane.setCenter(pane);
       borderPane.setBottom(hBox);
       // Create a scene and place borderpane in the stage
       Scene scene = new Scene(borderPane, 300, 200);
       primaryStage.setTitle("Test Scores");
       primaryStage.setScene(scene);
       primaryStage.show();
       btEnterScore.actionPerformed((ActionEvent e) {
           // Create array to store scores as elements
           double score;
           score = Double.parseDouble(tfEnterScore.getText());
           ArrayList list = new ArrayList(score);
           for(int i = 1; i <= score; i++)
               list.add(i);
           double sum = 0;
           for (int i = 0 ; i < list.size(); i++)
               sum += list(i);
           // Display results
           tfNumberOfScores.setText(String.format("", list.size()));
           tfAverageScore.setText(String.format("", sum / list.size()));
           tfBestScore.setText(String.format("", java.util.Collections.max(list)));
           }
           btClear.actionPerformed(e){
               list.clear();
               }
               btExit.actionPerformed(e){
                   System.exit(0);
                   }
               } public static void main(String[] args){
                   Application.launch(args);
                   }
                   }

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