Here is what i have done but i have some questions:

class masivins { public static void main (String args[]) {

    int mas[][] = {{0, 2, 7, 0, 8, 5, 3},
                   {0, 4, 0, 6, 0, 0, 0},
                   {0, 0, 0, 0, 3, 0, 0},
                   {7, 0, 0, 9, 1, 0, 7},
                   {5, 0, 4, 0, 0, 2, 0}};



    int nulmas[] =  new int [7]; 
    int nul=0; 

    for(int j=0; j<7; j++) {
        nul=0;
        for(int i=0; i<5; i++) {
            if(mas[i][j]==0) { 
                nul++;          
            }
        }
        nulmas[j]=nul; 
    }
    for(int i=0; i<5; i++) {
        for(int j=0; j<7; j++) {
            System.out.println(mas[i][j]);
        }
        System.out.println();
    }
    System.out.println();

    for(int i=0; i<5; i++) {

        System.out.println("Zeros in each array column: " + nulmas[i]);
    }
    System.out.println();

}

}

so my questions are: 1) why after running project there are only 5 "Zeros in each array column....." shown? 2) what and where i need to change in this code to get out the number of column in which zeros are least?