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Reference type determines which overloaded version (based on declared argument types) is selected. Happens at compile time. The actual method that s invoked is still a virtual method invocation that happens at runtime, but the compiler will already know the signature of the method to be invoked. So at runtime, the argument match will already have been nailed down, just not the actual class in which the method lives.
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5: Object Orientation, Overloading and Overriding, Constructors, and Return Types
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Overloaded and overridden methods in class relationships
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The current objective (5.2) covers both method and constructor overloading, but we ll cover constructor overloading in the next section, where we ll also cover the other constructor-related topics that are on the exam. Figure 5-4 illustrates the way overloaded and overridden methods appear in class relationships.
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Constructors and Instantiation (Exam Objectives 1.3, 6.3, 6.2)
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For a given class, determine if a default constructor will be created, and if so, state the prototype of that constructor. Write code to construct instances of any concrete class, including normal top-level classes and nested classes. Write code to invoke parental or overloaded constructor, and describe the effect of those invocations. Objects are constructed. You can t make a new object without invoking a constructor. In fact, you can t make a new object without invoking not just the constructor of the object s actual class type, but also the constructor of each of its superclasses! Constructors are the code that runs whenever you use the keyword new. We ve got plenty to talk about here we ll look at how constructors are coded, who codes them, and how they work at runtime. So grab your hardhat and a hammer, and let s do some object building. (Don t forget your lunch box and thermos.)
Constructors and Instantiation (Exam Objectives 1.3, 6.3, 6.2)
Constructor Basics
Every class, including abstract classes, must have a constructor. Burn that into your brain. But just because a class must have one, doesn t mean the programmer has to type it. A constructor looks like this:
class Foo { Foo() { } // The constructor for the Foo class }
Notice what s missing There s no return type! Remember from 2 that a constructor has no return type and its name must exactly match the class name. Typically, constructors are used to initialize instance variable state, as follows:
class Foo { int size; String name; Foo(String name, int size) { this.name = name; this.size = size; } }
In the preceding code example, the Foo class does not have a no-arg constructor. That means the following will fail to compile,
Foo f = new Foo(); // Won't compile, no matching constructor
but the following will compile,
Foo f = new Foo("Fred", 43); // No problem. Arguments match Foo constructor.
So it s very common (and desirable) for a class to have a no-arg constructor, regardless of how many other overloaded constructors are in the class (yes, constructors can be overloaded). You can t always make that work for your classes; occasionally you have a class where it makes no sense to create an instance without supplying information to the constructor. A java.awt.Color object, for example, can t be created by calling a no-arg constructor, because that would be like saying to the JVM, Make me a new Color object, and I really don t care what color it is you pick. (Imagine if the JVM were allowed to make aesthetic decisions. What if it s favorite color is mauve )
5: Object Orientation, Overloading and Overriding, Constructors, and Return Types
Constructor Chaining
We know that constructors are invoked at runtime when you say new on some class type as follows:
Horse h = new Horse();
But what really happens when you say new Horse()
1. Horse constructor is invoked. 2. Animal constructor is invoked (Animal is the superclass of Horse). 3. Object constructor is invoked (Object is the ultimate superclass of all classes, so class Animal extends Object even though you don t actually type "extends Object" in to the Animal class declaration. It s implicit.) At this point we re on the top of the stack. 4. Object instance variables are given their explicit values (if any). 5. Object constructor completes. 6. Animal instance variables are given their explicit values (if any). 7. Animal constructor completes. 8. Horse instance variables are given their explicit values (if any). 9. Horse constructor completes.
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