Main.java

package com.hoanbka.javafx.practice;

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;

import java.util.ArrayList;

public class Main extends Application {
    StudentManager studentManager = new StudentManager();
    ArrayList<Student> students = studentManager.getStudents();

    @Override
    public void start(Stage primaryStage) throws Exception {
        primaryStage.setTitle("Student Management System");

        Button addBtnMain = new Button("Add");
        Button removeBtn = new Button("Remove");

        VBox vBox = new VBox(addBtnMain, removeBtn);
        Scene scene = new Scene(vBox, 400, 200);
        primaryStage.setScene(scene);
        primaryStage.show();

        addBtnMain.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                Label nameLable = new Label("Name");
                TextField nameTxt = new TextField();
                nameTxt.setMaxSize(200, 100);

                Label idLable = new Label("ID");
                TextField idTxt = new TextField();
                idTxt.setMaxSize(200, 100);

                Label ageLable = new Label("Age");
                TextField ageTxt = new TextField();
                ageTxt.setMaxSize(200, 100);

                Button addBtn = new Button("Add");
                Button backBtn = new Button("Back");
                Button clearBtn = new Button("Clear");

                TextField result = new TextField();
                result.setMaxSize(200, 100);
                result.setDisable(true);

                VBox vBox = new VBox(nameLable, nameTxt, idLable, idTxt, ageLable, ageTxt, addBtn, backBtn, clearBtn, result);
                Scene addScene = new Scene(vBox, 400, 300);
                primaryStage.setScene(addScene);
                primaryStage.show();


                addBtn.setOnAction(new EventHandler<ActionEvent>() {
                    @Override
                    public void handle(ActionEvent event) {
                        try {
                            String name = nameTxt.getText();
                            String id = idTxt.getText();
                            int age = Integer.parseInt(ageTxt.getText());

                            Student student = new Student(name, id, age);
                            if (studentManager.addStudent(student)) {
                                result.setText("Successful");
                            } else {
                                result.setText("Failed");
                            }

                        } catch (NumberFormatException ex) {
                            System.out.println("NumberFormatException");
                            result.setText("Try again!!!");
                        }

                    }
                });

                backBtn.setOnAction(new EventHandler<ActionEvent>() {
                    @Override
                    public void handle(ActionEvent event) {
                        primaryStage.setScene(scene);
                        primaryStage.show();
                    }
                });
                clearBtn.setOnAction(new EventHandler<ActionEvent>() {
                    @Override
                    public void handle(ActionEvent event) {
                        nameTxt.setText("");
                        idTxt.setText("");
                        ageTxt.setText("");
                    }
                });
            }
        });


        removeBtn.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                Label removeIDLable = new Label("ID");
                TextField removeTxt = new TextField();
                removeTxt.setMaxSize(200, 20);

                Button removeBtnSub = new Button("Remove");
                Button backBtnSub = new Button("Back");


                TextField removeResultTxt = new TextField();
                removeResultTxt.setMaxSize(200, 20);
                removeResultTxt.setDisable(true);

                VBox vBox1 = new VBox(removeIDLable, removeTxt, removeBtnSub, backBtnSub, removeResultTxt);
                Scene removeScene = new Scene(vBox1, 400, 200);
                primaryStage.setScene(removeScene);
                primaryStage.show();


                removeBtnSub.setOnAction(new EventHandler<ActionEvent>() {
                    @Override
                    public void handle(ActionEvent event) {
                        try {

                            String removeID = removeTxt.getText();
                            if (studentManager.removeStudentByID(removeID)) {
                                removeResultTxt.setText("Successful");
                            } else {
                                removeResultTxt.setText("Failed");
                            }
                        } catch (NumberFormatException ex) {
                            ex.printStackTrace();
                        }
                    }
                });

                backBtnSub.setOnAction(new EventHandler<ActionEvent>() {
                    @Override
                    public void handle(ActionEvent event) {
                        primaryStage.setScene(scene);
                        primaryStage.show();
                    }
                });
            }
        });

    }

    public static void main(String[] args) {

        Application.launch(args);
    }

}