interface Employee {
    void doWork1();
    void doWork2();
    void doWork3();
}

class SomeClass {
    private List<Employee> employees;

    public void allDoWork1() {
        for (Employee each : employees) {
            each.doWork1();
        }
    }

    public void allDoWork2() {
        for (Employee each : employees) {
            each.doWork2();
        }
    }

    public void allDoWork3() {
        for (Employee each : employees) {
            each.doWork3();
        }
    }
}