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한 번 실행 한 후 if/else-if 문을 다시 실행하도록 코드를 변경하려면 어떻게해야합니까?한 번 실행 한 후에 메서드를 다시 시작하려면 어떻게해야합니까?
예. 어떻게 갈 수 상단 메뉴> 입력을위한 프롬프트 (이는 2) 당신은 어떤 종류를 사용할 수 있습니다
/**
* A simple program of a grocery store, which assists
* the purchases, calculate total price and display bill.
**/
public class GroceryStore {
// this method manages the entire shopping process
public void start() {
final String UPI = "wcor690"; // a constant for student UPI
Stock stock = new Stock();
stock.loadItems("stock.txt");
Cart cart = new Cart();
System.out.println("==============================================================");
System.out.println("------This is a simple grocery store program by " + UPI + ".------");
topMenu();
int input = getChoice(1, 3);
if (input == 1){
stock.displayItems();
topMenu();
}
else if (input == 2){
subMenu();
input = getChoice(1, 4);
if (input == 1){
String itemCode = Keyboard.readInput();
cart.addItem(stock.findItem(itemCode));
topMenu();
}
else if (input == 2){
String itemCode = Keyboard.readInput();
cart.deleteItem(itemCode);
subMenu();
}
else if (input == 3){
cart.checkOut();
}
else if (input == 4){
cart.deleteAll();
System.out.println("All items are cleared from the shopping cart");
topMenu();
}
}
else if (input == 3){
System.out.println("Exit");
}
stock.saveItems("stock2.txt");
System.out.println("--------------------------------------------------------------");
System.out.println("---------------Thank you for shopping with us!----------------");
System.out.println("==============================================================");
}
// this method displays the top-level menu
private void topMenu() {
System.out.println("1. Show items");
System.out.println("2. Start shopping online");
System.out.println("3. Exit");
}
// this method displays the second-level menu
private void subMenu() {
System.out.println("1. Add item");
System.out.println("2. Remove item");
System.out.println("3. Checkout");
System.out.println("4. Exit without buying");
}
// this method gets the user's input choice
private int getChoice(int lower, int upper) {
String userInput = Keyboard.readInput();
int input = Integer.parseInt(userInput);
while (input<lower || input>upper){
System.out.println("Invalid choice, please enter a valid choice");
input = Integer.parseInt(Keyboard.readInput());
}
return input;
}
}