• /* when to use textProperty and addListner
  textField.textProperty().addListener(new ChangeListener<String>() {
  
  @Override
  public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) {
  //throw new UnsupportedOperationException("Not supported yet.");
  //To change body of generated methods, choose Tools | Templates.
  
  txtArea.appendText("Text Changed :" + newValue + ")\n");
  set1.add(newValue);
  }
  });
  */
• textField.setOnKeyTyped(e -> handlekeyevent(e));

package javafxtemplate1;

//textProperty().addListener Listview Label
import java.util.ArrayList;
import java.util.List;
import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Group;
import javafx.scene.Scene;

import javafx.stage.Stage;
import javafx.scene.control.Label;
import javafx.scene.control.ListView;
import javafx.scene.control.ScrollPane;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.BorderPane;


/**
*
* @author Manas9
*/
public class JavaFXTemplate1 extends Application {
List<String> list1 = new ArrayList<>();
ObservableList<String> set1 = FXCollections.observableList(list1);
final TextArea txtArea = new TextArea();
Label label1 = new Label("Enter your name");
String str1="";
@Override
public void start(Stage primaryStage) throws Exception {
//
ListView<String> lvwList1 = new ListView<>((ObservableList<String>) set1);
lvwList1.setLayoutX(160); lvwList1.setLayoutY(0);
lvwList1.setMaxWidth(120);lvwList1.setMaxHeight(180);
//
Group groot1 = new Group();
Group groot2 = new Group();
//
label1.setLayoutX(10);label1.setLayoutY(20);
TextField textField = new TextField ();
textField .setLayoutX(160);textField .setLayoutY(20);
textField.setPromptText("Enter Your Name");
/*
textField.textProperty().addListener(new ChangeListener<String>() {

@Override
public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) {
//throw new UnsupportedOperationException("Not supported yet.");
//To change body of generated methods, choose Tools | Templates.

txtArea.appendText("Text Changed :" + newValue + ")\n");
set1.add(newValue);
}
});
*/
textField.setOnKeyTyped(e -> handlekeyevent(e));

BorderPane bpane = new BorderPane();
groot1.getChildren().addAll(textField,label1);
groot2.getChildren().addAll(txtArea, lvwList1);
bpane.setCenter(groot2);
bpane.setTop(groot1);
//Scene scene = new Scene(groot, 350, 150);
Scene scene = new Scene(bpane, 350, 250);
primaryStage.setScene(scene);
primaryStage.setTitle("ObservableSet:: ChangeListener");
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
public void handlekeyevent(KeyEvent e) {
// Consume the event if it is not a letter
String str = e.getCharacter();
int len = str.length();
for(int i = 0; i < len; i++) {
Character c = str.charAt(i);
if (!Character.isLetter(c)) {
e.consume();
}
}
//
if (!e.isConsumed()) {
String type = e.getEventType().getName();
txtArea.appendText("Text Changed :" + e.getCharacter()+ ")\n");
set1.add(type + " "+e.getCharacter());
label1.setText("lastword "+ e.getCharacter());
}
}
}


 

Runtime displays: