Using without if else statement how to avoid nullpointerexception in java

@Override
    public void save2(Optional<CheckResponse> response) {
        if (response.isPresent()) {
            CheckResponse checkResponse = response.get();
            if (checkResponse.getValue().isPresent()) {
                Optional<List<CheckDetails>> value = checkResponse.getValue();
                if (value.isPresent()) {
                    List<CheckDetails> checkDetails = value.get();
                    Stream<Checks> checksStream = checkDetails.stream().map(this::mapDtoCheckDetailsToEntiyChecks);
                    Optional<Checks> first = checksStream.findFirst();
                    if (first.isPresent()) {
                        Checks checks = first.get();
                        this.checkRepository.save(checks);
                    }
                }
            }
            Checked checked = new Checked();
            checked.setResponse(checkResponse.getResponse());
            checked.setServiceResponse(checkResponse.getServiceResponse());
            checked.setErrorMessage(checkResponse.getErrorMessage());
            if (checkResponse.getBrokenRules().isPresent()) {
                List<BrokenRulesResponse> brokenRulesResponses = checkResponse.getBrokenRules().get();
                brokenRulesResponses.forEach(brokenRulesResponse -> {
                    checked.setMessage(brokenRulesResponse.getMessage());
                    checked.setMember(brokenRulesResponse.getMember());
                    this.checkedRepository.save(checked);
                });
            }
        }
    }

if (users != null) {
    
    User user = users.get(0);
    if (user != null) {
        
        Address address = user.getAddress();
        if (address != null) {
        
            String state = address.getState();
            if (state != null) {
                System.out.println("State is " + state);
            }
        }
    }
}