import java.util.Scanner;
 
class Ex1 {
 private String name;
 private String[] subjects = new String[3];
 private float[][] notes = new float[3][4];
 private float[] subjectAverage = new float[3];
 float result;
 Scanner sc = new Scanner(System.in);
 
 private void PobierzImieOdUsera() {
  System.out.print("Podaj imię ucznia: ");
  name = sc.next();
 }
 
 private void PobierzPrzedmiotyIocene() {
  for (int i = 0; i < subjects.length; i++) {
   System.out.print("Podaj nazwy przedmiotów, których uczy się " + name + ": \n");
   subjects[i] = sc.next();
   for (int j = 0; j < notes[i].length; j++) {
    System.out.print("Podaj ocenę dla przedmiotu " + subjects[i] + ": \n");
    notes[i][j] = sc.nextFloat();
   }
  }
 }
 
 private void SrednieOcen() {
  for (int i = 0; i < subjectAverage.length; i++) {
   float average = 0;
   for (int j = 0; j < notes[i].length; j++) average += notes[i][j];
   subjectAverage[i] = average / notes[i].length;
   System.out.print("Srednia " + subjects[i] + ": " + subjectAverage[i] + " \n");
  }
 }
 
 public static void main(String[] args) {
  Ex1 n = new Ex1();
  n.PobierzImieOdUsera();
  n.PobierzPrzedmiotyIocene();
  n.SrednieOcen();
 }
}

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Kasia
Angielski
6
5
5
3
Niemiecki
5
4
4
4
Francuski
3
6
6
6