notaAlumno.java

package helloword;

import java.util.Scanner;

public class HelloWord {

    public static void main(String[] args) {

        //llamamos el scanner
        Scanner scan = new Scanner(System.in);

        //declarar variables;
        double matriz[][] = new double[4][4];
        double suma = 0.0;
        String nombre;

        for (int i = 0; i < 4; i++) {
            for (int j = 0; j < 3; j++) {
                System.out.println("ingrese la nota");
                matriz[i][j] = scan.nextDouble();

                suma = suma + matriz[i][j];

            }

                matriz[i][3] = suma/3;
                suma=0;
        }

        for (int i = 0; i < 4; i++) {
            System.out.println("laa notas del alumno "+i+" son ");
            for (int j = 0; j < 4; j++) {

                System.out.println("la nota n " +j+ " "+ matriz[i][j]);
            }

        }

    }

}