java - 提示输入数组大小

Question

我的程序按照我的意愿执行，但是我希望修改扫描仪，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。然后它将继续执行按顺序打印数字，然后按相反顺序打印数字。这是我当前的程序。我需要修改什么才能实现这一点？

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

使用此关注代码片段

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