Question

我有一个问题。我刚开始学习java中的数组。我理解数组以及它们的工作方式，以及存储数据的程度。但这是我的问题，我试图通过使用菜单向数组添加现有的整数。但是，我不明白为什么我的程序似乎不起作用。

import java.util.Scanner;

public class ArraySorting
{
public static void main(String[] args)
  {
     int option;
     int integer = 0;
     int optionOne;




     Scanner kb = new Scanner(System.in);
     System.out.println("Please enter a non-negative integer: ");
     integer = kb.nextInt();


     while((integer < 0))
     {
        System.out.println("I am sorry that is not a non-negative integer.");
        System.out.println("");
        System.out.println("Please enter a non-negative integer: ");
        integer = kb.nextInt();
     }

     option = displayMenu(kb);

     while (option != 6)
     {
        switch (option)
        {
           case 1:
              optionOne();
              System.out.println("Done with Option 1. Please enter another option.");
              break;
           case 2:
              //optionTwo();
              System.out.println("Done with Option 2. Please enter another option.");
              break;
           case 3:
              //optionThree();
              System.out.println("Done with Option 3. Please enter another option.");
              break;
           case 4:
              //optionFour();
              System.out.println("Done with Option 4. Please enter another option.");
              break;
           case 5:
              //optionFive();
              System.out.println("Done with Option 5. Please enter another option.");
              break;
        }
            option = displayMenu(kb);
     }
     if (option == 6)
     {
        System.out.println();
        System.out.println("Thank you. Have a nice day.");
     }
}

  private static int displayMenu(Scanner kb)
  {
     int option = 0;
     while (option != 1 && option != 2 && option != 3 && option != 4 && option !=5 && option !=6)
     {
        System.out.println("\t\t1. Add a number to the array\n\t\t2. Display the mean\n\t\t3. Display the median \n\t\t4. Print the array to the screen \n\t\t5. Print the array in reverse order \n\t\t6. Quit");
        option = kb.nextInt();

        if (!(option == 1 || option == 2 || option == 3 || option == 4 || option == 5 || option == 6))
           System.out.println("I am sorry that is an invalid choice. Please try again.");
     }
     return option;
  }



  private static int optionOne()
  {
     Scanner input = new Scanner(System.in);

     int[] numbers = new int[99];

     for (int i = 0; i < numbers.length; i++)
           {
              System.out.println("Please enter number");
              numbers[i] = input.nextInt();
           }
    return numbers;       
 }



}

Answer 1

代码有问题。

事情是你的函数optionOne应该返回一个整数数组。您已将返回类型设置为单个整数。

其中一个需要改变

如果必须返回数组，我认为是这种情况，那么函数看起来应该是这样的。

 private static int[] optionOne()
  {
     Scanner input = new Scanner(System.in);

     int[] numbers = new int[99];

     for (int i = 0; i < numbers.length; i++)
           {
              System.out.println("Please enter number");
              numbers[i] = input.nextInt();
           }
    return numbers;       
 }

干杯。

将数字添加到驱动的数组菜单中

1 个答案: