易写空安全表达式

One of the most commonly encountered exception in java is NullPointerException.....avoiding this is very easy, simply add null checks but this adds more complexity and less readability. Ex: To check whether a student residing country is America you have to write something like String countryName = student.getAddress().getCountry().getName(); But this is not safe...to make it safe you should write some think like below if(student != null && student.getAddress() != null && student.getAddress().getCountry() != null && student.getAddress().getCountry().getName() != null) { String countryName = student.getAddress().getCountry().getName();} Instead of writing such cumbersome conditions with this framework you can write something like String countryName = safe(obj(student).getAddress().getCountry().getName()); NOTE: Since the cu