简易自助售货机（JAVA)

package vendingmachine;

public class VendingMachine {
    int price = 80;
    int balance;
    int total;
    
    void showPrompt() {//欢迎语
        
        System.out.println("Welcome!");
    }
    
    void inserMomey(int amount) {//投币口
        balance = balance + amount;
    }
    
    void showBalance() {//用户余额显示
        System.out.println(balance);
    }
    
    void getFood() {//出货口
        if(balance >= price) {
            balance = balance - price;
            System.out.println("Here you are");
            total = total + price;
        }
    }
    
    public static void main(String[] args) 
    {
        VendingMachine vm = new VendingMachine();
        vm.showPrompt();
        vm.showBalance();
        vm.inserMomey(100);
        vm.getFood();
        vm.showBalance();
        
    }

}