Question

我的程序按照我的意愿执行，但我希望修改扫描程序，以便用户可以指定他们输入的数组的长度。因此，当程序启动时，它会询问有多少个数字。然后它将按顺序执行打印数字，然后按相反顺序打印。这是我目前的计划。我需要修改什么来允许这个？

import java.util.Scanner;

public class Assignment01b {

    public static void main (String[] args) {

        int[] numbers=new int[6];
        Scanner sc=new Scanner(System.in);
        System.out.println("Please enter elements...");
        for(int j=0;j<6;j++)
            numbers[j]=sc.nextInt();

         if (printOriginalArray(numbers) != 0)
             System.out.println("ERROR!");

         if (printInReverse(numbers) != 0)
             System.out.println("ERROR!");

         System.out.println("\nProgram completed successfully!");

    }

    public static int printOriginalArray(int[] list) {

        System.out.println("The list in order is: ");

         for (int num: list)
         System.out.print(num + " ");

         return 0;

    }

    public static int printInReverse(int[] list) {

        System.out.println("\nThe list in reverse order is:");

        for (int i = list.length-1; i >= 0; i--) {
            System.out.print(list[i] + " ");
        }

        return 0;

    }

}

Answer 1

使用此关注代码段

Scanner sc = new Scanner(System.in);
int[] numbers = new int[sc.nextInt()];

Answer 2

您只需要进行以下更改。

public static void main (String[] args) {


    Scanner sc=new Scanner(System.in);
    System.out.println("Please enter no of elements...");
    int noOfElements = sc.nextInt();
    int[] numbers=new int[noOfElements];
    System.out.println("Please enter elements...");
    for(int j=0;j<noOfElements;j++)
        numbers[j]=sc.nextInt();

     if (printOriginalArray(numbers) != 0)
         System.out.println("ERROR!");

     if (printInReverse(numbers) != 0)
         System.out.println("ERROR!");

     System.out.println("\nProgram completed successfully!");

}

提示输入的数组大小

2 个答案: