How to get Data from table in javafx - javafx

Question

I'm tried to get data from my table using for loop but it occur null point exception. this is my code
for (int i = 0; i < tabel_otapproclInfo.getItems().size(); i++) {
String s = tabel_otapproclInfo.getSelectionModel().getSelectedItem().getEMPLOYEEID();
String s2 = tabel_otapproclInfo.getSelectionModel().getSelectedItem().getEMPLOYEENAME();
String s3 = tabel_otapproclInfo.getSelectionModel().getSelectedItem().getEMPLOYEEDEPT();
String s4 = tabel_otapproclInfo.getSelectionModel().getSelectedItem().getSTATUS();
String s5 = tabel_otapproclInfo.getSelectionModel().getSelectedItem().getDATES();
String u = tabel_otapproclInfo.getSelectionModel().getSelectedItem().getUSERNMAE();
System.out.println(u + " " + s + " " + s2 + " " + s3 + " " + s4 + " " + s5);
}
in this code
tabel_otapproclInfo is table name
this is error is occerd
java.lang.NullPointerException
at ashoklayland.OTApprovelsController.actionApproverlAll(OTApprovelsController.java:126)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)

Answer 1

If you want to loop through all of the data in a Table you should take this approach. In this example, the Table object is Person.
for (int i = 0; i < table.getItems().size(); i++)
{
Person tempPerson = table.getItems().get(i);
System.out.println(tempPerson.getFirstName() + " " + tempPerson.getLastName() + " " + tempPerson.getEmail());
}
If you want to get a Person from a specific index, where the index >= 0 and index < table.getItems().size(), try:
Person tempPerson = table.getItems().get(1);
System.out.println("Specifice index 1: " + tempPerson.getFirstName() + " " + tempPerson.getLastName() + " " + tempPerson.getEmail());
If you want to get the Person after it has been selected use a listener.
table.getSelectionModel().selectedItemProperty().addListener((obs, oldSelection, newSelection) -> {
System.out.println("On Select: " + newSelection.getFirstName() + " " + newSelection.getLastName() + " " + newSelection.getEmail());
});
Full Code:
import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.VBox;
import javafx.scene.text.Font;
import javafx.stage.Stage;
public class TableViewSample extends Application
{
private final TableView<Person> table = new TableView();
private final ObservableList<Person> data
= FXCollections.observableArrayList(
new Person("Jacob", "Smith", "jacob.smith#example.com"),
new Person("Isabella", "Johnson", "isabella.johnson#example.com"),
new Person("Ethan", "Williams", "ethan.williams#example.com"),
new Person("Emma", "Jones", "emma.jones#example.com"),
new Person("Michael", "Brown", "michael.brown#example.com")
);
public static void main(String[] args)
{
launch(args);
}
#Override
public void start(Stage stage)
{
Scene scene = new Scene(new Group());
stage.setTitle("Table View Sample");
stage.setWidth(450);
stage.setHeight(500);
final Label label = new Label("Address Book");
label.setFont(new Font("Arial", 20));
table.setEditable(true);
TableColumn firstNameCol = new TableColumn("First Name");
firstNameCol.setMinWidth(100);
firstNameCol.setCellValueFactory(
new PropertyValueFactory<Person, String>("firstName"));
TableColumn lastNameCol = new TableColumn("Last Name");
lastNameCol.setMinWidth(100);
lastNameCol.setCellValueFactory(
new PropertyValueFactory<Person, String>("lastName"));
TableColumn emailCol = new TableColumn("Email");
emailCol.setMinWidth(200);
emailCol.setCellValueFactory(
new PropertyValueFactory<Person, String>("email"));
table.setItems(data);
table.getColumns().addAll(firstNameCol, lastNameCol, emailCol);
final VBox vbox = new VBox();
vbox.setSpacing(5);
vbox.setPadding(new Insets(10, 0, 0, 10));
vbox.getChildren().addAll(label, table);
((Group) scene.getRoot()).getChildren().addAll(vbox);
stage.setScene(scene);
stage.show();
for (int i = 0; i < table.getItems().size(); i++) {
Person tempPerson = table.getItems().get(i);
System.out.println(tempPerson.getFirstName() + " " + tempPerson.getLastName() + " " + tempPerson.getEmail());
}
Person tempPerson = table.getItems().get(1);
System.out.println("Specifice index 1: " + tempPerson.getFirstName() + " " + tempPerson.getLastName() + " " + tempPerson.getEmail());
table.getSelectionModel().selectedItemProperty().addListener((obs, oldSelection, newSelection) -> {
System.out.println("On Select: " + newSelection.getFirstName() + " " + newSelection.getLastName() + " " + newSelection.getEmail());
});
}
public static class Person
{
private final SimpleStringProperty firstName;
private final SimpleStringProperty lastName;
private final SimpleStringProperty email;
private Person(String fName, String lName, String email)
{
this.firstName = new SimpleStringProperty(fName);
this.lastName = new SimpleStringProperty(lName);
this.email = new SimpleStringProperty(email);
}
public String getFirstName()
{
return firstName.get();
}
public void setFirstName(String fName)
{
firstName.set(fName);
}
public String getLastName()
{
return lastName.get();
}
public void setLastName(String fName)
{
lastName.set(fName);
}
public String getEmail()
{
return email.get();
}
public void setEmail(String fName)
{
email.set(fName);
}
}
}