Anthony needs help with Java Programming as soon as possible. Anthony wrote: Hi

Question

Anthony needs help with Java Programming as soon as possible. Anthony wrote: Hi I have the below code for java fx, but I cannot get the csv to populate in last screen opened, the csv is in correct area, and I tested it out separately and it works on simpler code-think something must be incorrect? Hope you can help. import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import javafx.application.Application; import javafx.application.Platform; import javafx.geometry.Insets; import javafx.geometry.Pos; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.control.Label; import javafx.scene.control.ListView; import javafx.scene.control.TextArea; import javafx.scene.control.TextField; import javafx.scene.layout.BorderPane; import javafx.scene.layout.GridPane; import javafx.scene.layout.HBox; import javafx.scene.layout.VBox; import javafx.stage.Stage; public class FXMail extends Application { Stage window; Scene scene, scene1; ListView listView; //Labels to identify controls. Label lblNames, lblEmail, lblAddress; //Textfield to show email. TextField txtfEmail; //Textarea to show address. TextArea txtAddress; //Button to close the application. Button btnClose; //Listview to show list of contact names. ListView lvNames; //public FXMail() { // TODO Auto-generated constructor stub //}//constructor @Override public void init(){ //Instantiate controls. lblNames = new Label("Names:"); lblEmail = new Label("Email:"); lblAddress = new Label("Address:"); lvNames = new ListView (); txtfEmail = new TextField(); txtAddress = new TextArea(); btnClose = new Button("Close"); btnClose.setOnAction(ae -> Platform.exit()); lvNames.setOnMouseClicked(ae -> { //Get the selected name. String selectedName = lvNames.getSelectionModel().getSelectedItem(); //Call the method that populates the email and address fields. showEmailAndAddr("./contacts.csv", selectedName); }); }//init() private void showEmailAndAddr(String fileName, String selection){ //Read in the contact names from a file. //try to open a file. try{ String line; FileReader fr = new FileReader(fileName); BufferedReader buf = new BufferedReader(fr); while((line = buf.readLine()) != null){ if(line.startsWith(selection)){ //A 2-item array to hold the split line contents. String [] contactDataArray = new String[3]; //Split the string into 3 on ':' char. contactDataArray = line.split(":"); //Add the email to the email textfield txtfEmail.setText(contactDataArray[1]); //Add the address to the address textarea. txtAddress.setText(contactDataArray[2]); }//if }//while() //Done iterating through file lines. Close the file. buf.close(); }//try catch(IOException ioe){ ioe.toString(); }//catch }//showEmailAndAddr private void readContactNames(String contactsFile){ //Read in the contact names from a file. //try to open a file. try{ String line; FileReader fr = new FileReader(contactsFile); BufferedReader buf = new BufferedReader(fr); while((line = buf.readLine()) != null){ //A 3-item array to hold the split line contents. String [] contactDataArray = new String[3]; //Split the string into 2 on ':' char. contactDataArray = line.split(":"); //Add just the name to the listview. lvNames.getItems().add(contactDataArray[0]); }//while() //Done iterating through file lines. Close the file. buf.close(); //Sort the list of names in the listview. lvNames.getItems().sort(null); }//try catch(IOException ioe){ ioe.toString(); }//catch }//readContactNames() @Override public void start(Stage primaryStage) throws Exception { window = primaryStage; window.setTitle("FXMail"); //Layout 1 //GridPane with 8x padding around edge GridPane grid = new GridPane(); grid.setPadding(new Insets(8, 8, 8, 8)); grid.setVgap(10); grid.setHgap(10); grid.setAlignment(Pos.BASELINE_LEFT); //From Label - constrains use (child, column, row) Label fromLabel = new Label("From:"); GridPane.setConstraints(fromLabel, 0, 0); //from Input TextField fromInput = new TextField(); GridPane.setConstraints(fromInput, 1, 0); fromInput.setAlignment(Pos.BASELINE_RIGHT); //Subject Label Label subjectLabel = new Label("Subject:"); GridPane.setConstraints(subjectLabel, 0, 1); //Subject Input TextField subjectInput = new TextField(); GridPane.setConstraints(subjectInput, 1, 1); //To Label Label toLabel = new Label("To:"); GridPane.setConstraints(toLabel, 0, 2); //Subject Input TextField toInput = new TextField(); GridPane.setConstraints(toInput, 1, 2); //sidebutton-clicks to Dialog Button sideButton = new Button("..."); GridPane.setConstraints(sideButton, 2, 2); sideButton.setOnAction(e-> showAboutDialog()); TextArea textArea= new TextArea(); //textArea.setPrefHeight(200); //textArea.setPrefWidth(500); GridPane.setConstraints(textArea, 0, 3,3,3); //Ready Label - constrains use (child, column, row) Label readyLabel = new Label("Ready"); GridPane.setConstraints(readyLabel, 0, 7); //Quitbutton Button quitButton = new Button("Quit"); quitButton.setOnAction(ae -> Platform.exit()); GridPane.setConstraints(quitButton, 3, 6); //Sendbutton Button sendButton = new Button("Send"); GridPane.setConstraints(sendButton, 4, 6); //Add everything to grid grid.getChildren().addAll(fromLabel, fromInput, subjectLabel, subjectInput,toLabel, toInput, sideButton, textArea, readyLabel, quitButton, sendButton); Scene scene = new Scene(grid, 400, 300); window.setScene(scene); window.show(); //Layout 2 Label label1 = new Label("Addresses"); Button button1 = new Button("Go back"); Button button2 = new Button("Address book"); button1.setOnAction(e-> window.setScene(scene)); VBox layout2 = new VBox(20); layout2.getChildren().addAll(label1, button1, button2); scene1 = new Scene(layout2, 200, 200); //Create a second layout. VBox vbNames = new VBox(); vbNames.setSpacing(5); VBox vbAddresses = new VBox(); vbAddresses.setSpacing(5); HBox hbButton = new HBox(); hbButton.getChildren().add(btnClose); hbButton.setAlignment(Pos.BASELINE_RIGHT); GridPane gpMain = new GridPane(); gpMain.setPadding(new Insets(5)); gpMain.setHgap(10); gpMain.setVgap(10); //Add components to the layout. vbNames.getChildren().addAll(lblNames, lvNames); vbAddresses.getChildren().addAll(lblEmail, txtfEmail, lblAddress, txtAddress); gpMain.add(vbNames, 0, 0); gpMain.add(vbAddresses, 1, 0); gpMain.add(hbButton, 1, 1); scene1 = new Scene(gpMain ); //Set the scene. //window.setScene(scene1); //Populate the listview with names. readContactNames("./contacts.csv"); //Show the stage. //window.show(); } //this is for the Dialog box public void showAboutDialog() { Stage dialogStage = new Stage(); dialogStage.setWidth(400); dialogStage.setHeight(200); dialogStage.setTitle("Address Book"); dialogStage.setResizable(false); dialogStage.setMaximized(false); dialogStage.setAlwaysOnTop(true); //Label for a msg Label lblDirectory =new Label (""); //Ok button Button btnOK= new Button ("OK"); //Cancel button Button btnCancel= new Button ("Cancel"); Button btnAddresses= new Button ("Addresses"); //Handle clicks on the buttons btnOK.setOnAction(ae -> dialogStage.close()); btnCancel.setOnAction(ae -> dialogStage.close()); btnAddresses.setOnAction(e-> window.setScene(scene1)); BorderPane bp =new BorderPane(); bp.setCenter(lblDirectory); bp.setBottom(btnOK); bp.setRight(btnCancel); bp.setLeft(btnAddresses); Scene scene3 =new Scene (bp, 400,200); ///set the scene dialogStage.setScene(scene3); //show the stage dialogStage.show(); } public static void main(String[] args) { launch(args); }}//start()

Explanation / Answer

Check if the file contacts.csv is in the same directory where the java file has been saved if yes then the file may be corrupted

otherwise provide the path to that file using fileName.getPath() method instant of just fileName

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