Java - While Loop不断重复披萨程序

Question

我是一名新的 Java 程序员，我正在编写一个披萨程序，我试图在其中设置和获取披萨的大小，但是如果用户输入了错误的值，我就会陷入循环。我希望它继续要求用户输入尺寸。如果我还可以在输出总价方面获得帮助，那么一旦我获得尺寸并从 Pizza2 类获得价格，那将是很棒的，但如果不是，我只是试图至少解决这个问题，因为尺寸卡在了循环。

package hello;

import java.util.Scanner;

public class Pizza2Test 
{
    private static Scanner userInput; //declare scanner

    private static Pizza2 [] pizzaList; //declare pizzaList array

    public static void main (String [] args)
    {
        userInput = new Scanner(System.in); //initalize scanner 

        System.out.print("Enter quantity of pizzas: "); //ask user to enter quantity of pizza
        int lQuantity = userInput.nextInt(); //store users input
        pizzaList = new Pizza2[lQuantity]; //creating a pizza list with quantity being the size of the array

        populatePizzaList(); 
        displayPizzaList();

        userInput.close(); //close scanner
    } 
    //populate the array with pizza information
    //
    private static void populatePizzaList ()
    {
        int numberOfToppings = 0;
        //System.out.println("Length of Array: " + pizzaList.length);
        for (int cnt = 0; cnt < pizzaList.length; cnt++) //start at 0 and increment and loop until 1 less than pizzaLists length
        {
            Pizza2 myPizza = new Pizza2(); //call Pizza2 class
            System.out.print("Enter size of pizzas (enter '0' for Large or '1' for Medium or '2' for Small): "); //ask user to enter size
            myPizza.setSize(userInput.nextInt()); //store size from pizza2 class
            while(true)
            {
                if(myPizza.getSize() == 0)
                {
                    myPizza.getLARGE();
                    break;
                }
                else if (myPizza.getSize() == 1)
                {
                    myPizza.getMEDIUM();
                    break;
                }
                else if (myPizza.getSize() == 2)
                {
                    myPizza.getSMALL();
                    break;
                }
                else
                {
                    System.out.println("Please enter '0' for Large or '1' for Medium or '2' for Small. ");
                }           
                }
            System.out.print("Enter number of toppings of pizzas: "); //ask user to enter number of toppings
            numberOfToppings = userInput.nextInt();
            String [] myToppings = new String[numberOfToppings];
            //myPizza.setNumberOfToppings(userInput.nextInt());//store user number of toppings
            //String [] myToppings = new String[myPizza.getNumberOfToppings()];
            //int pNumberOfToppings = myPizza.getNumberOfToppings();
            for (int i = 0; i < myToppings.length ; i++) //start at 0 and increment until number of toppings
            {
                System.out.print("Enter toppings: ");//ask user to enter toppings
                myToppings[i] = userInput.next();//store user toppings
            }
            myPizza.setToppings(myToppings);
            pizzaList [cnt] = myPizza;
        }
    }
    //display the array with pizza information from the pizza array list
    //
    private static void displayPizzaList ()//number of pizza information to display 
    {
        System.out.println("Quantity: " + pizzaList.length);//get quantity from stored value
        for (int j = 0; j < pizzaList.length; j++) //start at 0 and loop until pizza list length
        {
            System.out.println("Size: " + pizzaList[j].getSize());//get size from stored value
            System.out.println("Number Of Toppings: " + pizzaList[j].getNumberOfToppings());//get number of toppings from stored value
            String [] myToppings = pizzaList[j].getToppings();//get toppings from stored value
            for (int i = 0; i < myToppings.length; i++)
            {
                System.out.println("Toppings: [" + (i+1) + "]: " + myToppings[i]);
            }
        }
    }       
}

package hello;

public class Pizza2 
{
    private int size;
    private String [] toppings;
    private int numberOfToppings;
    private double price;
    private final double LARGE = 13.99;
    private final double MEDIUM = 10.99;
    private final double SMALL = 7.99;
    private final double TOPPINGS = 0.50;

    public Pizza2()
    {

    }
    public void setSize (int pSize)
    {
        size = pSize;
    }

    public int getSize()
    {
        return size;
    }
    public void setToppings (String [] pToppings)
    {
        toppings = pToppings;
    }

    public String [] getToppings()
    {
        return toppings;
    }
    private void setNumberOfToppings ()
    {
        numberOfToppings = toppings.length;
    }

    public int getNumberOfToppings()
    {
        return numberOfToppings;
    }
    public void setPrice (double pPrice)
    {
        price = pPrice;
    }
    public double getPrice()
    {
    //  if(size )
        return price;
    }
    public double getLARGE() {
        return LARGE;
    }
    public double getMEDIUM() {
        return MEDIUM;
    }
    public double getSMALL() {
        return SMALL;
    }
    public double getTOPPINGS() {
        return TOPPINGS;
    }
}

Answer 1

一旦您以“错误”大小进入 while (true) 循环，您不会做任何改变大小的事情，因此您永远不会跳出循环。