java - 使用扫描仪生成阵列

Question

我正在使用java，想要使用扫描仪来获取用户输入，然后输出数组。

我创建了一个适用于其中一个的文件，另一个适用于另一个的单独文件，但我想询问用户问题并获取自定义数组属性(可变数量的数组、可变行、变量列、变量加法，数组的减法和乘法)

import java.util.Scanner;
import java.io.IOException;

public class ScannerDemoforNetbeans
{

public static void main (String [] args)throws IOException
{
//`enter code here`
System.out.println ("Okay, you got it! How many rows  do you want");
   Scanner rc= new Scanner (System.in);
   public static rows;
   rows= rc.nextInt();
   System.out.println ("How many columns do you want?");
   Scanner c = new Scanner (System.in);
   public static columns;
   columns = c.nextInt();
   System.out.println ("Rows" + rows);
   System.out.println ("Columns:" + columns);


}
   // }   
   // public static void createarray (String [] args)
   // {
    int matWidth = ScannerDemoforNetbeans.columns;
        int matHeight = ScannerDemoforNetbeans.rows;
        int maxCellValue = 70;

                    int [][] mat1 = new int [matHeight][matWidth];
                    int [][] mat2 = new int [matHeight][matWidth];
                    int [][] sum = new int [matHeight][matWidth];

                    for (int i=0; i<matHeight; ++i)
                    {
                        for (int j=0; j<matWidth; ++j)
                        {
                            java.util.Random r = new java.util.Random();
                            mat1 [i][j]= r.nextInt (maxCellValue);
                            mat2 [i][j] = r.nextInt (maxCellValue);
                        }
                    }

                    print2Darray (mat1);
                    System.out.println ();
                    print2Darray (mat2);
                    for (int i=0; i<matHeight; ++i)
                    {
                        for (int j=0; j<matWidth; ++j)
                        {
                            sum [i][j]= mat1 [i][j] + mat2 [i][j];
                        }
                    }
                    System.out.println ();
                    print2Darray (sum);
    }
    public static void print2Darray (int[][]arr)
    {
        for (int [] i : arr)

        {
          for (int j : i)  
          {
              System.out.print (j + " ");
          }
        System.out.println();
        }
    System.out.println ();
    }
}

感谢任何帮助。

Answer 1

package araay;
import java.util.Scanner;

public class Araay {

    public static void main(String[] args)
    {

      Scanner a=new Scanner(System.in);
     int i=0;
     int j=0;
     int arr[][]=new int [3][3];
     System.out.println ("Enter the numbers");

     for (i=0;i<=3;i++)
          for(j=0;j<=3;j++)
     arr[i][j]=a.nextInt();>>>Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3
    at araay.Araay.main(Araay.java:18)//this error is occur in this code plz solve it



     for (i=0;i<=3;i++)
     for(j=0;j<=3;j++)
      System.out.println("The matrix of array is "+arr[i][j]+"\t");
      System.out.println();
    }


}