Instance Variable Hiding

Instance Variable Hiding As you know, it is illegal in Java to two local variables with the same name inside the same or enclosing scopes. interestingly, you can have local variables, including formal parameters to methods, which overlap with the names of the...

Parameterized Constructors

Parameter Constructors While the Box( ) constructor in the preceding example does initialize a Box object, it is . not very useful=-all boxes have the same dimensions. What is needed is a way to construct Box objects of various dimensions. The easy solution is to add...

Constructors

Constructors It can be tedious to initialize all of the variables in a class each time an instance is created. Even when you add convenience functions like set Dim( ), it would be simpler and more concise to have all of the setup done at the time the object is first...

Returning a Value

Returning a Value While the implementation of volume( ) does move the computation of a box's volume inside the Box class where it  it is not the best way' to do it. For example, what if another part of your program wanted to know the volume of a box, but not...

Adding a Method to the Box Class

Adding a Method to the Box Class Although it is perfectly fine to create a class that contains only data, it rarely happens, Most of the time you will use methods to access the instance variables defined by the . . class. In fact, methods dcfir e the interface to most...

Assigning Object Reference Variable

Assigning Object Reference Variable Object reference variables act differently than you might expect when an assignment , takes place. For example, what do you think the following fragment docs?You might think that  is being assigned a reference to a copy of the...