src/main/java/design/controller/userinput/Menu.java


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

package design.controller.userinput;

import java.util.*;

public abstract class Menu {
    public abstract String getTitle();

    public abstract List<MenuOption> getMenuOptions();

    public void present() {
        var menuOptions = getMenuOptions();
        System.out.println();
        System.out.printf("-- %s --\n", getTitle().toUpperCase());
        for (int i = 1; i <= menuOptions.size(); i++) {
            MenuOption menuOption = menuOptions.get(i-1);
            System.out.printf("%s: %s\n", i, menuOption.getName());
        }

        System.out.printf("Selection (%s..%s): ", 1, menuOptions.size());
        Scanner sc = new Scanner(System.in);
        var line = sc.nextLine();

        try {
            int i = Integer.parseInt(line) - 1;
            menuOptions.get(i).onAction();
        } catch (IndexOutOfBoundsException | NumberFormatException ex) {
            System.err.printf("Invalid option \"%s\"\n", line);
            present();
        }
    }

}