java - 不适用于参数 (void) 错误

Question

您好，我正在开发一个项目，但遇到一个无法解决的错误。 Eclipse 程序的错误消息是:

Exception in thread "main" java.lang.Error: Unresolved compilation problems: The method add(String) in the type List is not applicable for the arguments (void) The method add(String) in the type List is not applicable for the arguments (void) ham cannot be resolved

at PizzaChoice.main(PizzaChoice.java:50)

这就是代码:

        System.out.print("\nDo you want thick base?");
    input = keyboard.nextLine();
    choice = input.charAt(0);
    if (choice == 'y'){
        pizza.thick.setCost(8.75);
        pizza.thick.getType();
        l.add(pizza.thick.getType());
        c.add((double) pizza.thick.getCost());
        totalPizzaBasePrice = totalPizzaBasePrice + pizza.thick.getCost();

Answer 1

getType() 或 getCost() 返回类型为 void。