对二维整数数组进行操作

问题遇到的现象和发生背景

对二维整数数组进行操作

用代码块功能插入代码，请勿粘贴截图
package lab3;
import java.util.Scanner;
public class Part2 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Enter the count of columns: ");
int columns = scanner.nextInt();
System.out.println("Enter the count of rows: ");
int rows = scanner.nextInt();
int[][] matrix = new int[rows][columns];
java.util.Random random = new java.util.Random();
for (int i = 0; i < rows; i++) 
{
for (int j = 0; j < columns; j++)
matrix[i][j] = random.nextInt(10) - 4;
}
int[] countByRows = new int[rows];

//输出二维数组
for (int i = 0; i < rows; i++) 
{
for (int j = 0; j < columns; j++)
System.out.print(matrix[i][j] + " ");
System.out.println();
}

//计数至少有一个零元素的行
int amount = 0 ;
for (int i = 0; i < rows; i++)
    if ( [rows] == 0) 
    {
        amount = amount+ 1 ;
    }
System.out.println("The number of rows with at least one zero element is" + amount);

//找出具有相同元素最多的列的列数



}
}
运行结果及报错内容

计数至少有一个零元素的行报错

我想要达到的结果

1.计数至少有一个零元素的行
2.找出具有相同元素最多的列的列数


package lab3;
import java.util.Scanner;
public class Part2 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Enter the count of columns: ");
int columns = scanner.nextInt();
System.out.println("Enter the count of rows: ");
int rows = scanner.nextInt();
int[][] matrix = new int[rows][columns];
java.util.Random random = new java.util.Random();
for (int i = 0; i < rows; i++) 
{
for (int j = 0; j < columns; j++)
matrix[i][j] = random.nextInt(10) - 4;
}
int[] countByRows = new int[rows];
 
//输出二维数组
//计数至少有一个零元素的行
int amount = 0 ;
for (int i = 0; i < rows; i++) 
{
  boolean flag=false;
  for (int j = 0; j < columns; j++){
     if(matrix[i][j]==0){
        flag=true;
    }
    System.out.print(matrix[i][j] + " ");
  }
  if(flag)
    amount = amount+ 1 ;
  System.out.println();
}
 
System.out.println("The number of rows with at least one zero element is" + amount);
 
//找出具有相同元素最多的列的列数
 
 
 
}
}

题目是什麽？
countByRows 数组没有初始化，也没有给数组赋值啊。应该将初始值都设置为1
你得遍历矩阵每一行，判断元素是0，然后将countByRows数组指定行的值设置为0，然后用下面的循环才能知道有几行有0

for (int i = 0; i < rows; i++)
    if (countByRows[i]== 0) 
    {
        amount = amount+ 1 ;
    }
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