program to calculate product of each column in matrix

Write a java program to calculate product of each column in matrix : 

import java.util.Random;
import java.util.Scanner;

public class ColumnWiseProduct {

public static void main(String[] args) {
ColumnWiseProduct cwp=new ColumnWiseProduct();
int arr[][]=cwp.readmatrix();
cwp.dispMat(arr);
int prod[]=cwp.prodColWise(arr);
System.out.println("Entered matrix Column wise product is :");
cwp.dispSingleArray(prod);

}
int[] prodColWise(int mat[][]){
int prod[]=new int[mat[0].length];
for(int i=0;i<mat[0].length;i++) {
prod[i]=1;
for(int j=0;j<mat.length;j++) {
prod[i]=prod[i]*mat[j][i];
}
} return prod;
}
int[][] readmatrix(){
Scanner sc=new Scanner(System.in);
System.out.println("Enter Row size and column size :");
int row=sc.nextInt();
int col=sc.nextInt();
int mat[][]=new int[row][col];
System.out.println("Enter Elements in Table : ");
for(int i=0;i<row;i++) {
for(int j=0;j<col;j++) {
mat[i][j]=sc.nextInt();
}
}return mat;
}
void dispMat(int mat[][]) {
  for(int i=0;i<mat.length;i++) {
for(int j=0;j<mat[i].length;j++) {
System.out.print(mat[i][j]+" ");
}System.out.println();
}
  }
void dispSingleArray(int arr[]) {
for(int i=0;i<arr.length;i++) {
System.out.print(arr[i]+" ");
}
}

}