SOLUTION FOUND
This code works with fxml.files and rest of the code I used was from Slaws's answer.
Main.java:
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
final static ExecutorService threadPool = Executors.newFixedThreadPool(3, r -> {
var t = new Thread(r);
t.setDaemon(true);
return t;
});
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("mainScreen.fxml"));
String css = this.getClass().getResource("style.css").toExternalForm();
Scene scene = new Scene(root);
scene.getStylesheets().add(css);
stage.setMinHeight(800);
stage.setMinWidth(1200);
stage.setScene(scene);
stage.show();
}
@Override
public void stop() {
threadPool.shutdownNow();
}
}
Controller.java
import java.io.IOException;
import javafx.fxml.FXML;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.text.Font;
import javafx.application.Platform;
public class Controller {
@FXML
private TextArea console;
@FXML
private TextField inputPane;
public void initialize() throws IOException{
wireInputAndOutput(inputPane, console);
startConsoleTask();
}
static void wireInputAndOutput(TextField input, TextArea output) throws IOException {
var inputConsumer = StreamWriter.redirectStandardIn(Main.threadPool);
StreamReader.redirectStandardOut(new BufferedTextAreaAppender(output), Main.threadPool);
input.setOnAction(e -> {
e.consume();
var text = input.textProperty().getValueSafe() + "\n";
output.appendText(text);
inputConsumer.accept(text);
input.clear();
});
}
private void startConsoleTask() {
Main.threadPool.execute(new ConsoleTask(Platform::exit));
}
}
Edit 2
the problem now is that the ConsoleTask doesn't run when I put it inside controller.java (this is the problem atm.). It worked when I copy/pasted Slaw's main.java but I wanted to use fxml file so I tried this and it doesn't work anymore.
test.fxml:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.TextArea?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.VBox?>
<VBox maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="700.0" prefWidth="800.0" style="-fx-background-color: white;" xmlns="http://javafx.com/javafx/18" xmlns:fx="http://javafx.com/fxml/1" fx:controller="Controller">
<children>
<TextArea fx:id="console" editable="false" prefHeight="200.0" prefWidth="200.0" VBox.vgrow="ALWAYS">
<VBox.margin>
<Insets bottom="20.0" />
</VBox.margin>
</TextArea>
<TextField fx:id="inputPane" prefHeight="40.0" VBox.vgrow="ALWAYS" />
</children>
<padding>
<Insets bottom="20.0" left="20.0" right="20.0" top="20.0" />
</padding>
</VBox>
ConsoleTask.java:
import java.util.NoSuchElementException;
import java.util.Scanner;
class ConsoleTask implements Runnable {
private final static Scanner scanner = new Scanner(System.in);
private final Runnable onExit;
ConsoleTask(Runnable onExit) {
this.onExit = onExit;
}
@Override
public void run() {
System.out.println("WELCOME TO CONSOLE APP!");
boolean running = true;
while (running && !Thread.interrupted()) {
printOptions();
int choice = readInt("Choose option: ", 1, 20);
switch (choice) {
case 1 -> doCheckIfLeapYear();
case 2 -> doCheckIfPrime();
case 3 -> doPrintStringBackwards();
case 20 -> running = false;
default -> System.out.println("Unknown option!");
}
System.out.println("\nPlease wait...");
wait(6000);
}
onExit.run();
}
private void printOptions() {
System.out.println();
System.out.println("Options");
System.out.println("-------");
System.out.println(" 1) Test Leap Year");
System.out.println(" 2) Test Prime");
System.out.println(" 3) Print String backwards");
System.out.println(" 20) Exit");
System.out.println();
}
private int readInt(String prompt, int min, int max) {
while (true) {
System.out.print(prompt);
try {
int i = Integer.parseInt(scanner.nextLine());
if (i >= min && i <= max) {
return i;
}
} catch (NumberFormatException | NoSuchElementException ignored) {
}
System.out.printf("Please enter an integer between [%,d, %,d]%n", min, max);
}
}
private void doCheckIfLeapYear() {
System.out.println();
int year = readInt("Enter year: ", 0, 1_000_000);
if (year % 4 == 0 || (year % 100 == 0 && year % 400 != 0)) {
System.out.printf("The year %d is a leap year.%n", year);
} else {
System.out.printf("The year %d is NOT a leap year.%n", year);
}
}
private void doCheckIfPrime() {
System.out.println();
int limit = readInt("Enter an Integer: ", 1, Integer.MAX_VALUE);
while (limit <= 1){
System.out.print("Wrong number! the number should be higher or equal to 2: ");
limit = scanner.nextInt();
}
if(isPrime(limit)){
System.out.println(limit+" is a prime number.");
}else{
System.out.println(limit+" is not a prime number.");
}
}
private static boolean isPrime(int n){
if(n <= 1){
return false;
}
for(int i = 2; i <= Math.sqrt(n); i++){
if(n % i == 0){
return false;
}
}
return true;
}
private static void doPrintStringBackwards(){
System.out.println();
System.out.print("\nEnter a word or a sentence: ");
String answer = scanner.nextLine();
//StackOverflow version: (simple)
System.out.println("\n"+new StringBuilder(answer).reverse().toString());
//Lecture version:
/*for (int i = answer.length()-1;i>=0;i--){
System.out.print(answer.charAt(i));
}*/
}
private static void wait(int ms){
try {
Thread.sleep(ms);
}
catch(InterruptedException ex) {
Thread.currentThread().interrupt();
}
}
}
Edit 1
The result I want to achieve with this is:
to use the text field in the gui as an input to the java console program but I have no idea how to achieve that result.
Original
I'm new to java/javaFX and I'm trying to make a console gui app. The problem is that I can't find a way to redirect system.in to JavaFX text field.
I have tried these solutions but I didn't get them working:
pictures of some of the code:
