如何继续执行子菜单'；sJava终端菜单

这是目前的菜单。我想创建要发货和订购的子菜单。 我真的很想知道怎么做。当我选择船舶备选方案时，我希望另一个菜单显示不同的船舶，具体为10艘

最好的方法是什么

提前谢谢

import java.util.Scanner;

public class Main {
boolean exit;

public static void main(String[] args) {
    Main main = new Main();
    main.runMenu();


}

public void runMenu() {
    printHeader();
    while(!exit) {
        printMenu();
        int choice = getInput();
        performAction(choice);
    }
}

private void printHeader() {
    System.out.println("+-----------------------------------+");
    System.out.println("|          Welcome operator!        |");
    System.out.println("+-----------------------------------+");
}

private void printMenu() {
    System.out.println("\nMake your selection");
    System.out.println("1) Ship");
    System.out.println("2) Order");
    System.out.println("3) Map");
    System.out.println("4) Status");
    System.out.println("0) Exit");
}

private int getInput() {
    Scanner kb = new Scanner(System.in);
    int choice = -1;
    while(choice < 0 || choice > 4) {
        try {
            System.out.print("\nEnter your choice");
            choice = Integer.parseInt(kb.nextLine());
        }
        catch (NumberFormatException e) {
            System.out.println("Invalid selection. Please try again");
        }
    }
    return choice;
}

---

如果这不是你想要的，告诉我

用户做出选择后，可以使用清除控制台

new ProcessBuilder("cmd", "/c", "cls").inheritIO().start().waitFor();

然后打印出下一个子菜单

例如（此方法可能非常冗长，但适用于简单的文本菜单）：

new ProcessBuilder("cmd", "/c", "cls").inheritIO().start().waitFor();

public static void main(String[] args) {
     while (true) {
     new ProcessBuilder("cmd", "/c", "cls").inheritIO().start().waitFor();
     System.out.println("1. Food");
     System.out.println("2. Drink");
     System.out.println("3. Quit");

     //get user input

      if (userInput == 1) {         //food submenu (submenus can be easily put in functions)
          new ProcessBuilder("cmd", "/c", "cls").inheritIO().start().waitFor();
          System.out.println("1. Apple");
          System.out.println("2. Banana");
          System.out.println("3. Back");

          //get and process input
      } else if (userInput == 2) {         //drink submenu (submenus can be easily put in functions)
          new ProcessBuilder("cmd", "/c", "cls").inheritIO().start().waitFor();
          System.out.println("1. Water");
          System.out.println("2. Juice");
          System.out.println("3. Back");

          //get and process input
      } else break;
    }
  }