如何通過返回主方法然後輸入第二個方法將兩個平行數組從一種方法移動到另一種方法？

Question

我需要兩個字符串和雙陣列去從inputAccept表：

inputAccept(); 

    table(names, costs); 

    public static void inputAccept() { 
      Scanner scan = new Scanner(System.in); 
      String[] names = {"","","","","","","","","",""}; 
      double[] costs = new double[10]; 

      for (int i = 0; i < 10; i++) 
      { 
       System.out.println("Enter the name of item " + (i + 1) + ": "); 
       names[i] = scan.nextLine(); 
       System.out.println("Enter item cost: "); 
       costs[i] = scan.nextDouble(); 
      } 
    } 

    public static void table(String[] names, double[] costs) { 
    //insert code using the arrays 
    } 

我知道這是錯的，但我不知道該做些什麼來解決它。

Answer 1

這種方法是清潔嬰兒的底部

private class InputResult { 
    //generate constructor with both fields 
    String[] names; //generate getter 
    double[] costs; //generate getter 
} 

然後

public static InputResult inputAccept() 
    ... 
    return new InputResult(names, costs); 

public static void table(InputResult input) 
    String[] names = input.GetNames(); 
    ... 

Answer 2

public class Main { 

    static String[] names = {"","","","","","","","","",""}; 
    static double[] costs = new double[10]; 

    public static void main(String[] args) { 
     inputAccept(); 

     table(names, costs); 
    } 



    public static void inputAccept() { 
     Scanner scan = new Scanner(System.in); 

     for (int i = 0; i < 10; i++) 
     { 
      System.out.println("Enter the name of item " + (i + 1) + ": "); 
      names[i] = scan.next(); 
      System.out.println("Enter item cost: "); 
      costs[i] = scan.nextDouble(); 
     } 
    } 

    public static void table(String[] names, double[] costs) { 
     for (String name: names) { 
      System.out.println(name); 
     } 
     for (double value: costs) { 
      System.out.println(value); 
     } 
    } 
} 

Answer 3

您只需創建兩個數組中的主要方法，那麼首先將它們傳遞到inputAccept方法，然後將兩個數組傳入表方法：

public static void main(String[] args) { 
     double[] costs = new double[10]; 
     String[] names = {"","","","","","","","","",""}; 
     inputAccept(names, costs); 
     table(names, costs); 
    } 

    public static void inputAccept(String[] names, double[] costs) { 
     Scanner scan = new Scanner(System.in); 
     for (int i = 0; i < 10; i++) 
     { 
      System.out.println("Enter the name of item " + (i + 1) + ": "); 
      names[i] = scan.nextLine(); 
      System.out.println("Enter item cost: "); 
      costs[i] = scan.nextDouble(); 
     } 
    } 

    public static void table(String[] names, double[] costs) { 
    //insert code using the arrays 
    } 

Answer 4

首先，它看起來像是從用戶輸入中創建「項目」。我覺得造型類Item應該是第一步：

public final class Item { 
    private final String name; 
    private final double cost; 

    public Item(String name, double cost) { 
     this.name = name; 
     this.cost = cost; 
    } 

    public String getName() { 
     return name; 
    } 

    public double getCost() { 
     return cost; 
    } 
} 

然後inputAccept()變爲：

public static Item[] inputAccept() { 
    Item[] items = new Item[10]; 

    try (Scanner scan = new Scanner(System.in)) { 
     for (int i = 0; i < items.length; i++) { 
      System.out.println("Enter the name of item " + (i + 1) + ": "); 
      String name = scan.next(); 
      System.out.println("Enter item cost: "); 
      double cost = scan.nextDouble(); 

      items[i] = new Item(name, cost); 
     } 
    } 

    return items; 
} 

因此，table(...)成爲

public static void table(Item[] items) { 
    // insert code using the arrays 
} 

和最終用途是

public static void main(String[] args) { 
    table(inputAccept()); 
}