Alarm Clock

Controller.java

package sample;

import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.TextField;
import javafx.scene.text.Text;
import javafx.util.Duration;

import java.net.URL;
import java.util.ResourceBundle;

public class Controller implements Initializable {

    //Time time = new Time(new CurrentTime().currentTime());
    Time time = new Time("12:13:34");


    @FXML
    private Text timer;

    @FXML
    private TextField alarmTime;

    Timeline timeline = new Timeline(
            new KeyFrame(Duration.seconds(1),
                    e -> {
                        if(time.getCurrentTime().equals(alarmTime.getText())){
                            System.out.println("ALARM!");
                        }
                        time.oneSecondPassed();
                        timer.setText(time.getCurrentTime());
            }));

    @Override
    public void initialize(URL url, ResourceBundle resourceBundle) {
        timer.setText(time.getCurrentTime());

        timeline.setCycleCount(Timeline.INDEFINITE);
        timeline.play();
    }
}

CurrentTime.java

package sample;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class CurrentTime {

    DateTimeFormatter dtf = DateTimeFormatter.ofPattern("HH:mm:ss");
    LocalDateTime now = LocalDateTime.now();

    public CurrentTime(){
    }

    public String currentTime(){
        return dtf.format(now);
    }
}

Main.java

package sample;

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 {

    @Override
    public void start(Stage primaryStage) throws Exception{
        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
        primaryStage.setTitle("Hello World");
        primaryStage.setScene(new Scene(root));
        primaryStage.show();
    }


    public static void main(String[] args) {
        launch(args);
    }
}

sample.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<?import javafx.scene.text.Text?>


<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" style="-fx-background-color: #EAF4D3;" xmlns="http://javafx.com/javafx/15.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
   <children>
      <Text fx:id="timer" layoutX="61.0" layoutY="93.0" strokeType="OUTSIDE" strokeWidth="0.0" text="Text">
         <font>
            <Font size="38.0" />
         </font>
      </Text>
      <TextField fx:id="alarmTime" layoutX="57.0" layoutY="226.0" />
   </children>
</AnchorPane>

time.java

package sample;

public class Time {
    private int hour;
    private int minute;
    private int second;

    public Time(int hour, int minute, int second) {
        this.hour = hour;
        this.minute = minute;
        this.second = second;
    }

    public Time(String currentTime) {
        String[] time = currentTime.split(":");
        hour = Integer.parseInt(time[0]);
        minute = Integer.parseInt(time[1]);
        second = Integer.parseInt(time[2]);
    }

    public String getCurrentTime(){
        return hour + ":" + minute + ":" + second;
    }

    public void oneSecondPassed(){
        second++;
        if(second == 60){
            minute++;
            second = 0;
            if(minute == 60){
                hour++;
                minute = 0;
                if(hour == 24){
                    hour = 0;
                    System.out.println("Next day");
                }
            }
        }
    }
}

good job