src/main/java/seedu/address/model/ModelManager.java
@Override
    public void updateObservedDataFilteredStaffList(Predicate<Staff> predicate) {
        requireNonNull(predicate);
        filteredStaffs.setPredicate(predicate);
    }
/**
     * Update observed data filtered staff list.
     */
Update observed data filtered staff list.
Update observed data filtered staff list .
@Override
    public void updateObservedDataFilteredStaffList(Predicate<Staff> predicate) {
        requireNonNull(predicate);
        filteredStaffs.setPredicate(predicate);
    }
@ Override public void updateObservedDataFilteredStaffList ( Predicate < Staff > predicate ) { requireNonNull ( predicate ) ; filteredStaffs . setPredicate ( predicate ) ; }
Update observed data filtered staff list.
Update observed data filtered staff list .