I need to connect to databse. But not sure where can i add my database connected

Question

I need to connect to databse. But not sure where can i add my database connected code on the following code?

import java.util.ArrayList;

import java.util.Arrays;

import javafx.application.Application;

import javafx.event.ActionEvent;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.control.ComboBox;

import javafx.scene.control.Label;

import javafx.scene.control.TextField;

import javafx.scene.layout.GridPane;

import javafx.stage.Stage;

public class Project9 extends Application {

ArrayList<CourseEntry> enrolled = new ArrayList<>();

String courses[] = {"CS1T1", "CS1T2", "CS1T3", "CS1T4", "CS1T5" };

public static void main(String... args) {

launch(args);

}

@Override

public void start(Stage primaryStage) throws Exception {

// create buttons

Button btnRegister = new Button("Register");

Button btnExit = new Button("Exit");

// create SSN label and text box

Label lbSSN = new Label("SSN");

TextField tfSSN = new TextField();

// create Course label and combo box

Label lbCourses = new Label("Course");

ComboBox cbCourses = new ComboBox(); // create a combo box

// Add courses to the combobox

cbCourses.getItems().addAll(Arrays.asList(courses));

// add an action event handle to the button register

btnRegister.setOnAction((ActionEvent t) -> {

String ssn = tfSSN.getText(); // read the ssn

String course= cbCourses.getValue().toString();// get selected course

register(ssn, course);

tfSSN.setText("");

});

// add an action event handle to the button exit

btnExit.setOnAction((ActionEvent t) -> {

System.out.println("Exiting the application");

System.exit(0);

});

// add all components to a grid layout

GridPane layout = new GridPane();

layout.add(lbSSN, 0, 0, 1, 1);

layout.add(tfSSN, 1, 0, 1, 1);

layout.add(lbCourses, 0, 1, 1, 1);

layout.add(cbCourses, 1, 1, 1, 1);

layout.add(btnRegister, 1, 4, 4, 4);

layout.add(btnExit, 2, 4, 4, 4);

// set a gap between components

layout.setHgap(10);

layout.setVgap(10);

Scene scene = new Scene(layout, 290, 140);

primaryStage.setTitle("Enrollment");

primaryStage.setScene(scene);

primaryStage.setResizable(false);

primaryStage.show();

}

private void register(String ssn, String course) {

CourseEntry ce = new CourseEntry(ssn, course);

enrolled.add(ce);

System.out.println("Entrolled : "+ce);

}

}

// a class to hold one registration

class CourseEntry {

private String SSN, Course;

public CourseEntry(String SSN, String Course) {

this.SSN = SSN;

this.Course = Course;

}

public String getSSN() {

return SSN;

}

public void setSSN(String SSN) {

this.SSN = SSN;

}

public String getCourse() {

return Course;

}

public void setCourse(String Course) {

this.Course = Course;

}

@Override

public String toString() {

return "CourseEntry[" + "SSN : " + SSN + ", Course : " + Course + ']';

}

}

Explanation / Answer

package squarecalculator;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class SquareCalculator extends Application {
private TextField inputField;
private TextField outputField;
private Button btnSquare;
@Override
public void start(Stage primaryStage) {
inputField =new TextField();
outputField = new TextField();
btnSquare = new Button();
//btnSquare.prefHeight(100);
//btnSquare.prefWidth(100);
btnSquare.setText("Get Square");
VBox box=new VBox(10);
box.autosize();
box.setAlignment(Pos.CENTER);
  
btnSquare.setOnAction(new EventHandler<ActionEvent>() {
  
@Override
public void handle(ActionEvent event) {
double in=Double.parseDouble(inputField.getText());
outputField.setText(Double.toString(in*in));
}
});
  
// StackPane root = new StackPane();
box.getChildren().addAll(inputField,outputField,btnSquare);
  
Scene scene = new Scene(box, 300, 250);
  
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
  
}

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