無法將字符串轉換爲字符串拆分類中間的兩倍？

Question

嗨即時通訊讀取用戶在這種形式的輸入

「字符串/雙/ int/int/int」或「字符串/雙/ int/int」，根據形狀的飲料。

下面是我對Parser類的代碼。

public class DrinkParser { 

    public static Drink parseStringToDrink(String lineToParse){ 

     String regex = "[/]"; 
     String [] split = lineToParse.split(regex); 

     if ("Box".equals(split[0]) || "box".equals(split[0])){ 

      DrinkInBox dIB = new DrinkInBox(split[1], split[2], split[3], split[4], split[5]); 


     } 

     if("Cylinder".equals(split[0]) || "cylinder".equals(split[0])){ 

      DrinkInCylinder dIC = new DrinkInCylinder(split[1], split[2], split[3], split[4]); 

     } 

    } 



} 

繼承人DrinkInBox和DrinkInCylinder類的代碼...我覺得它的相關。

public class DrinkInBox extends Drink { 

    private int height; 
    private int width; 
    private int depth; 

    public DrinkInBox(String drinkId, double unitPrice, int height, int width, int depth){ 

     super(drinkId, unitPrice); 
     this.height = height; 
     this.width = width; 
     this.depth = depth; 

    } 

    public void computeTotalPrice(){ 

     volume = height * width * depth; 
     totalPrice = volume * unitPrice; 

    } 

    public String toString(){ 

     return "\nThe Drink in a Box\nThe Height:\t\t" +height+ "\nThe Width:\t\t" +width+ "\nThe Depth:\t\t" +depth+ "\nThe DrinkId:\t\t" +drinkId+ "\n The Volume:\t\t" +volume+ "\nThe Unit Price:\t\t" +unitPrice+ "\n The Total Price:\t" +totalPrice+ "\n\n"; 

    } 

} 

繼承人邊喝邊Cylinder類

public class DrinkInCylinder extends Drink { 

    private int radius; 
    private int height; 

    public DrinkInCylinder(String drinkId, double unitPrice, int radius, int height){ 

     super(drinkId, unitPrice); 
     this.radius = radius; 
     this.height = height; 

    } 

    public void computeTotalPrice(){ 

     volume = (int) (Math.PI * (radius*radius) * height); 
     totalPrice = volume * unitPrice; 

    } 

    public String toString(){ 

     return "\nThe Drink in a Cylinder\nThe Radius:\t\t" +radius+ "\nThe Height:\t\t" +height+ "\nThe DrinkId:\t\t" +drinkId+ "\n The Volume:\t\t" +volume+ "\nThe Unit Price:\t\t" +unitPrice+ "\n The Total Price:\t" +totalPrice+ "\n\n"; 

    } 

} 

我知道它的很多，但我感謝所有幫助，你們可能能夠提供。

Answer 1

DrinkInBox dIB = new DrinkInBox(split[1], split[2], split[3], split[4], split[5]); 

split是String[]，所以split[n]，0 <= n <= split.length-1，將返回一個String。現在讓我們來看看你的DrinkInBox構造：

public DrinkInBox(String drinkId, double unitPrice, int height, int width, int depth) 

您傳遞5個String S作爲一個論點，但你沒有一個DrinkInBox構造有5個String參數。您必須相應地解析每個分割，以便它與您的DrinkInBox構造函數的參數類型相匹配。

DrinkInBox dIB = new DrinkInBox(split[1], Double.parseDouble(split[2]), Integer.parseInt(split[3]), Integer.parseInt(split[4]), Integer.parseInt(split[5])); 

在你的代碼中還有另一種情況。你需要做同樣的事情。另外，只是一個改進的提示，你應該對繼承和多態性感到滿意。 DrinkInBox和DrinkInCylinder都有一個共同的超類。你可以重寫爲：

Drink drink = split[0].equalsIgnoreCase("box") ? new new DrinkInBox(split[1], Double.parseDouble(split[2]), Integer.parseInt(split[3]), Integer.parseInt(split[4]), Integer.parseInt(split[5])) : split[0].equalsIgnoreCase("cylinder") ? new DrinkInCylinder(split[1], Double.parseDouble(split[2]), Integer.parseInt(split[3]), Integer.parseInt(split[4]), Integer.parseInt(split[5])) : null; 

如果它不是一個箱子或圓筒，drink將null。您可以檢查，看它是否是一個DrinkInBox或DrinkInCylinder通過執行instanceof檢查：

if(drink instanceof DrinkInBox) 
if(drink instanceof DrinkInCylinder)