quiethaa.blogg.se

What access modifier should be used for each class? Mark for Reviewġ5. They desire that all portions of their code should have access to the classes that they write. It is possible to overload a method that is not a constructor. Static methods can read instance variables. Static methods can write to instance variables. Static methods can return any object type.

There is no way to tell without seeing the methods for Dog and the methods for HousePet.ġ0. No, because ref must be declared either a HousePet or a Dog, but not both. Yes, because polymorphism allows this since Dog is a subclass of HousePet. HousePet Scooby = new Dog() Mark for Review Would this code be correct if a Dog is a HousePet? Why or Why not? What allows Java to correctly and automatically determine which method to invoke based on the type of object being referred to at the time the method is called? Mark for Reviewĩ. (*)Ī structure that categorizes and organizes relationships among ideas, concepts of things with the most general at the top and the most specific at the bottom.ħ. What is encapsulation? Mark for ReviewĪ keyword that allows or restricts access to data and methods.Ī programming philosophy that promotes simpler, more efficient coding by using exiting code for new applications.Ī programming philosophy that promotes protecting data and hiding implementation in order to preserve the integrity of data and methods. Knowing that a square always has the same width and length, which of the following best represents a constructor for the Square class? Consider creating a class Square that extends the Rectangle class provided below.

If you inherit a class, you do not inherit the class' constructors.

Java's garbage collection is when all references to an object are gone, the memory used by the object is automatically reclaimed. In Java, an instance field referenced using the this keyword generates a compilation error. The references car1 and car2 are pointing to two Car Objects in memory. The reference car2 points to an exact copy of the Car Object that car1 references. There is a Car object that car2 referenced that is now slated for removal by the garbage collector. There is a Car object that car1 referenced that is now slated for removal by the garbage collector.