Programação JAVA

CÓDIGO DE UM PROGRAMA COM MATRIZ

// TODO code application logic here
        double M_a[][] = new double [2][4];
        int i, j;
        for(i=0;i<2;i++) {
            for(j=0;j<4;j++) {
                if ((i+j)% 2==0){
                    M_a[i][j] = ((2*(Math.pow(i,2)))+j);
                }
                else                   
                M_a[i][j] = 1;
            }
        }
            for (i=0;i<2;i++) {              
                 for (j=0;j<4;j++) {
                System.out.print(M_a[i][j]+" |");
            }
                System.out.println("");
        }
    }
}