Prime numbers in java.

Question

I have a matrix and i need to find in even line the prime number. How can i do that? My matrix is: int matrix [][]=new int [3][];
matrix [0]=new int []{1,2,3};
matrix [1]=new int []{1,2,3};
matrix [2]=new int []{1,2,3};

Answer 1

yeah but how? should i use “for” and “if”. i tried a lot of exemples and still cant. i tries and exemples from inet, but they are not for beginers, i want smth simple to understand the syntax

Answer 2

Thank you very much. ))

Answer 3

public class ArrayProblem
public static void main(String[] args) {
int matrice[][] = new int[3][];
matrice[0] = new int[] { 1, 2, 3 };
matrice[1] = new int[] { 2, 1, 3 };
matrice[2] = new int[] { 3, 2, 1 };

for (int i = 1; i < matrice.length - 1; i++) {

for (int k=0; k<matrice[i].length;k++) {

if (i % 2 == 1) {

}System.out.println();
}
}
}
}

Answer 4

what about this? how can i find them in this way? i don’t know how ro use scanner