Question

我的老师要我编写代码，要求用户提供所需的行数和列数，然后使用该输入来创建2d数组。但是每次我尝试将变量放在行和列括号中时，都会在第17行收到此错误：

“表达式必须是数组类型，但解析为类”

package Theatre;

import java.util.Scanner;

public class BoxOffice {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in); 

        System.out.print("How many rows do you want in your Theatre");
        int r = input.nextInt(); input.nextLine();
        System.out.print("How many Columns do you want in your Theatre");
        int c = input.nextInt(); input.nextLine();
        System.out.printf("You want %d rows and %d columns in your Theatre", r, c);
        int [] [] seat = int [r] [c];  // <-- line 17

我希望在第17行创建一个2d数组，其中用户想要的行r放在行括号内，而列括号内的列却出现错误。

Answer 1

The new keyword is what you need to use to create a new instance of something, including an array.

int [] [] seat = new int [r] [c];

Answer 2

Scanner input = new Scanner(System.in);

    System.out.print("How many rows do you want in your Theatre");
    int r = input.nextInt(); input.nextLine();
    System.out.print("How many Columns do you want in your Theatre");
    int c = input.nextInt(); input.nextLine();
    System.out.printf("You want %d rows and %d columns in your Theatre", r, c);


    int [] [] seat = new int [r] [c];

You forgot to put the new Keyword on your array declaration.

将用户输入插入二维数组

2 个答案: