Scanner scan1 = new Scanner(System.in);
        String text = scan1.nextLine();          //Text eingeben

        int cntA = 0;
        int cntE = 0;
        int cntI = 0;
        int cntO = 0;
        int cntU = 0;

        for(int a = 0; a < text.length(); a++){

            String actualChar = text.substring(a, a+1).toString();


            switch (actualChar){
                case ("a"): { cntA++; break;}
                case ("A"): { cntA++; break;}

                case ("e"): { cntE++; break;}
                case ("E"): { cntE++; break;}

                case ("i"): { cntI++; break;}
                case ("I"): { cntI++; break;}

                case ("o"): { cntO++; break;}
                case ("O"): { cntO++; break;}

                case ("u"): { cntU++; break;}
                case ("U"): { cntU++; break;}
            }

        }

        System.out.println("Enthaltene A's: " + cntA);
        System.out.println("Enthaltene E's: " + cntE);
        System.out.println("Enthaltene I's: " + cntI);
        System.out.println("Enthaltene O's: " + cntO);
        System.out.println("Enthaltene U's: " + cntU);