在添加到Java中的數組之前刪除字符

Question

首先我知道ArrayLists並且不希望將它們用於此程序。我正在爲當地動物園制定一個計劃（很開始的階段，不會是最終版本）。它需要用戶輸入並允許他們輸入動物和他們吃的食物。如果我一次輸入一種食物，我的程序就能正常工作，但我正在努力解決的是如何處理用戶輸入，並添加多種食物。 （提示會引導他們輸入以逗號分隔的食物，但是有些用戶可能只是在兩者之間使用空格，我需要通過錯誤消息或簡單地接受它和CSV來解釋。）有沒有辦法做到這一點，以後檢索添加逗號的值？對不起，我對Java很新，感謝您的幫助！

代碼的用戶輸入：

//create array 
    static String[][] animalFood; 

    String[][] addArray(int x) { 

    animalFood = new String[x][2]; 
    Scanner in = new Scanner(System.in); 

    //loop through array and add amount of items user chose 
    for (int row = 0; row < animalFood.length; row++){ 
     System.out.print("Enter an animal name: "); 
     animalFood[row][0] = in.nextLine(); 
     System.out.print("Enter the food the animal eats: "); 
     animalFood[row][1] = in.nextLine(); 
     } 

     System.out.println("Thank you for adding information to the zoo!"); 
     System.out.println("You entered the following information: "); 

     //loop through and print the informationa added 
     for(int i = 0; i < animalFood.length; i++) 
     { 
      for(int j = 0; j < animalFood[i].length; j++) 
      { 
      System.out.print(animalFood[i][j]); 
      if(j < animalFood[i].length - 1) System.out.print(" - "); 
      } 
      System.out.println(); 
} 

代碼搜索功能：

String[][] searchArray(String name) { 

    String matchResult = "There was no " + name + " found in the zoo!"; 
    String itemToMatch = name.toUpperCase(); 
    String arrayItem = ""; 
    String food = ""; 
    for (int i = 0; i < animalFood.length; i++) { 
     arrayItem = animalFood[i][0]; 
     arrayItem = arrayItem.toUpperCase(); 
     if(arrayItem.equals(itemToMatch)){ 
      matchResult = "The animal " + name + " was found in the zoo! It eats " + animalFood[i][1];   
     } 
     else { 
      //nothing found 
     }  
    } 
    System.out.println(matchResult); 
    if (food != null) { 
    System.out.println(food); 
    } 
    return animalFood; 
} 

Answer 1

可以使用字符串的分割（）方法將其破碎成隔開字符串的數組給定的分隔符。

for(int row = 0; row < animalFood.length; row++){ 
    System.out.print("Enter an animal name: "); 
    animalFood[row][0] = in.nextLine(); 
    System.out.print("Enter the foods the animal eats: "); 
    //all of the foods separated by commas 
    String[] foods = in.nextLine().split(","); 
    for(int i = 0; i < foods.length; i++) { 
     animalFood[row][i + 1] = foods[i]; 
    } 
} 

你將不得不增加animalFood的第二維度的最大指數，不過，考慮到多種食物（或者，雖然這是比較複雜的，你可以動態地將其複製到一個數組調整陣列具有更大的最大指數）。

對於搜索，您將不得不嵌套另一個循環來列出所有項目。

for (int i = 0; i < animalFood.length; i++) { 
    arrayItem = animalFood[i][0]; 
    arrayItem = arrayItem.toUpperCase(); 
    if(arrayItem.equals(itemToMatch)){ 
     matchResult = "The animal " + name + " was found in the zoo! It eats "; 
     //Iterates over the foods it eats 
     for(int j = 1; j < animalFood[i].length; j++) { 
      //If this is the last food in the list 
      if(j == animalFood[i].length - 1) { 
       matchResult += "and " + animalFood[i][j] + "."; 
      } 
      else { 
       matchResult += animalFood[i][j] + ", "; 
      } 
     }   
    } 
    else { 
     //nothing found 
    }  
}