How can I get many integers from the same text field? - javafx

Question

I want to retrieve several integers from the same text field, but I can't figure out how to do it. Anyone?

Answer 1

Here is a clearer solution. This will throw and error for incorrect input.
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
/**
*
* #author blj0011
*/
public class JavaFXApplication37 extends Application {
#Override
public void start(Stage primaryStage) {
Label info = new Label("Enter some numbers. Each seperated by one space");
TextField tf = new TextField();
Label label = new Label();
Button btn = new Button();
btn.setText("Sum Numbers");
btn.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
if(tf.getText().length() > 0)//Only run if the text field is not empty
{
String[] stringOfNumbers = tf.getText().split(" ");//The numbers must be seperated by one space. This get the string of numbers and seperates them based on the space between each numbers
//sum up the numbers
double sum = 0;
for(int i = 0; i < stringOfNumbers.length; i++)
{
sum = sum + Double.parseDouble(stringOfNumbers[i]);//This sums the numbers and convert the strings to doubles
}
label.setText("The sum equals: " + sum);//This prints the sum of the doubles
}
}
});
VBox root = new VBox();
root.getChildren().addAll(info, tf, label, btn);//This adds all the nodes to the VBox
Scene scene = new Scene(root, 300, 250);//This adds the VBox to the Scene
primaryStage.setTitle("Sum Numbers");
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* #param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
I noticed this question asked to handle integers. In this code change double to int and Double to Integer.
I am adding this solution since your solution did not contain a button
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
/**
*
* #author blj0011
*/
public class JavaFXApplication37 extends Application {
#Override
public void start(Stage primaryStage) {
Label info = new Label("Enter some numbers each seperated by one space");
Label label = new Label();
TextField tf = new TextField();
tf.textProperty().addListener((observable, oldValue, newValue) -> {
try
{
if(newValue.length() > 0)//Only run if the text field is not empty
{
String[] stringOfNumbers = tf.getText().split(" ");//The numbers must be seperated by one space. This get the string of numbers and seperates them based on the space between each numbers
//sum up the numbers
int sum = 0;
for(int i = 0; i < stringOfNumbers.length; i++)
{
sum = sum + Integer.parseInt(stringOfNumbers[i]);//This sums the numbers and convert the strings to doubles
}
label.setText("The sum equals: " + sum);//This prints the sum of the doubles
}
else
{
label.setText("");//if no text in textfield set label to empty string
}
}
catch(NumberFormatException ex)
{
label.setText("");//any number format error set label to empty string
}
});
VBox root = new VBox();
root.getChildren().addAll(info, tf, label);//This adds all the nodes to the VBox
Scene scene = new Scene(root, 300, 250);//This adds the VBox to the Scene
primaryStage.setTitle("Sum Numbers");
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* #param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}