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我的全部程序如下。

我遇到的问题是我的标准输出被这行特定代码产生的错误消息淹没了。

  for(int x = 0; x < 3; x++)
  {
    for(int xx = 0; xx < 6; xx++)
    {
      if(toppings[x].equalsIgnoreCase(validToppings[xx]))
      {price += 0.75;} else {System.out.println("Error in Pizza class: Attempt to set invalid pizza topping " + toppings[x]);};
    }
  }

我宁愿不重新编写我花了很多时间完善的代码，但如果我必须使用 switch 语句或类似的东西来获得简洁的错误消息，我会的。虽然我认为我目前的方法是最好的。

以下是该课程的测试，

public class TestPizza
{
  public static void main(String args[])
  {
    int x;
    String t1[] = {"Mushrooms", "Onions", ""};
    String t2[] = {"Pepperoni", "Mushrooms", ""};
    String t3[] = {"Pepperoni", "Mushrooms", "Onions"};
    String t4[] = {"Sausage", "", ""};
    Pizza one = new Pizza();
    Pizza two = new Pizza();
    Pizza three = new Pizza();
    Pizza four = new Pizza();

one.setSize(12);
one.addTopping(t1);
one.showValues();

two.setSize(8);
two.addTopping(t2);
two.showValues();

three.setSize(16);
three.addTopping(t3);
three.showValues();

four.setSize(20);
four.addTopping(t4);
four.showValues();

  }
}

这是课堂。

// This custom class is used to create Pie objects
// It stores the data about the Pie in four variables:
// size, price, type and baked
// It lets the program that creates the Pie object set these values using four methods:
// setSize, setPrice, setType and bake

public class Pizza
{

  // Declare four variables that can store the values for each pie
  // Each Pie object will have their own, separate copy of these variables 12.
    private int size;
    private double price;
    private boolean baked;
    private int x;
    private int xx;
    private String validToppings[] = {"mushrooms", "pepperonis", "onions", "mushroom", "pepperoni", "onion"};
    private String toppings[] = new String[3];


    // The "constructor" method is called when a new pie
    // object is first created. We use it to set "default" values.
    // Our typical pie is 10 inches, costs $8 and is not baked yet
    // We don't yet know what the pie filling will be
    Pizza()
    {
      size = 999;
      price = 999;
      baked = false;
    }

    // showValues() is a void method that displays the values of the
    // current Pie
    public void showValues()
    {
      System.out.println("Pie Size: " + size);
      for(int x = 0; x < 3; x++) {if(toppings[x] != ("")) {System.out.println("With " + toppings[x]);}};
      System.out.println("Price of Pie: $" + price + "\n\n");
    }

    // getSize() returns the size of the pie
    public int getSize()
    {
      return size;
    }
    // getPrice() returns the price of the pie
    public double getPrice()
    {
      return price;
    }
    // baked() returns whether or not the pie is baked
    public boolean getBaked()
    {
      return baked;
    }
    // setSize() assigns a size to the pie
    public void setSize(int thisSize)
    {
      size = thisSize;
      switch(size)
      {
        case 8: price = 10.00; break;
        case 12: price = 14.00; break;
        case 16: price = 18.00; break;
        default: System.out.println("Error in Pizza class: Attempt to set invalid Pizza size."); break;
      }
    }

    // setPrice() assigns a price to the pie
    public void addTopping(String programToppings[])
    {
      for(int x = 0; x < 3; x++)
      {
        toppings[x] = programToppings[x];
      }
      for(int x = 0; x < 3; x++)
      {
        toppings[x] = toppings[x].toLowerCase();
      }
      for(int x = 0; x < 3; x++)
      {
        for(int xx = 0; xx < 6; xx++)
        {
          if(toppings[x].equalsIgnoreCase(validToppings[xx]))
          {price += 0.75;} else {System.out.println("Error in Pizza class: Attempt to set invalid pizza topping " + toppings[x]);};
        }
      }
    }

  public void bake()
  {
    baked = true;
  };

}
4

3 回答 3

1

您应该使用最初设置为的boolean变量。找到匹配项后，将其设置为。在所有迭代完成后，如果仍然是，则打印错误消息。isValidfalsetrueisValidfalse

于 2012-04-23T07:55:33.313 回答
0 
  boolean error = false;
  for(int x = 0; x < 3; x++)
  {
    for(int xx = 0; xx < 6; xx++)
    {
      if(toppings[x].equalsIgnoreCase(validToppings[xx]))
      {price += 0.75;} else {error = true;};
    }
  }
  if(error){
    System.out.println("Error in Pizza class: Attempt to set invalid pizza topping");
  }

如果您还想保留顶部信息，则需要将每个顶部存储在一个列表中（只需在每次错误设置为 true 时添加），然后在 if(error) 语句中迭代该列表。

于 2012-04-23T07:57:11.850 回答
0

如果出现错误，您可能不想继续循环。我也会使用 Set 作为有效的浇头。

// set globally.
Set<String> validTopppingSet = new HashSet<String>();
for(String t: validToppings) validToppingSet.add(t.toLowerCase());

// when checking the toppings.
for(String topping: topping) {
    if (validToppings.contains(topping.toLowerCase())) {
        price += 0.75;
    } else {
        price = Double.NaN;
        System.out.println("Error in Pizza class: Attempt to set invalid pizza topping: " + topping); // it useful to know what was invalid.
        break;
    }
}
于 2012-04-23T08:04:20.047 回答