Exam 1z0-808 topic 1 question 160 discussion

BF is the good answer

All will compile except D & E

Correct is BF. public class App { public static void main(String[] args) { Employee employee = new Employee(); Employee manager = new Manager(); Employee director = new Director(); director.stockOptions = 1_000; employee.salary = 50_000; manager.budget = 1_000_000; manager.stockOption = 500; employee.budget = 200_000; director.salary = 80_000; } } class Employee { public int salary; } class Manager extends Employee { public int budget; } class Director extends Manager { public int stockOptions; }

all compile except DE, so i guest the question normally is which two options don't compile

The answer is DE, why? Because apparently the question is wrong, the question should be which of those DONT compile, because ABCF work fine, those who answered only BF might have problems later with similar questions..

BF are correct. 1. The type of the object determines which properties exist within the object in memory. 2. The type of the reference to the object determines which methods and variables are accessible to the Java program. class Employee{ public int salary; } class Manager extends Employee{ public int budget; } public class Director extends Manager{ public int stockOptions; public static void main(String[] args) { Employee employee = new Employee(); Employee manager = new Manager(); Employee director = new Director(); // director.stockOptions = 1_000; // Compilation Error employee.salary = 50_000; // manager.budget = 1_000_000; // Compilation Error // manager.stockOption = 500; // Compilation Error // employee.budget = 200_000; // Compilation Error director.salary = 80_000; } }

The answer is BF but this is a tricky question as it involves inheritance and polymorphism. But you can make it less complicated if we eliminate the wrong ones: -> Let's start with the letter B, she is evidently right, because "Employee" is the parent class and the method is hers, so we already have a right alternative. -> We are already sure that the letter B is the first correct one, when looking at the code, we realize that all objects are a variable of type "Employee", that is, they can access anything public of the "Employee" class without problems , and the only answer we have with that is the letter F.