Test

public class test{

    public static void main (String[] args){
        int [][] mat1 = {{1,2,3,4},
                   {5,6,7,8},
                   {9,10,11,12}};
        Matrix myMat = new Matrix(mat1);
        myMat.printMat();
        myMat.reverseAllRows();
        myMat.printMat();
      }

    }