Data Structures and Algorithms in Java[1].pdf - Fulvio Frisone

Sometimes, in a Java class, it is convenient to reference the current instance of
that class. Java provides a keyword, called this, for such a reference. Reference
this is useful, for example, if we would like to pass the current object as a
parameter to some method. Another application of this is to reference a field
inside the current object that has a name clash with a variable defined in the
current block, as shown in the program given in Code Fragment 2.1.
Code Fragment 2.1: Sample program illustrating
the use of reference this to disambiguate between a
field of the current object and a local variable with the
same name.
When this program is executed, it prints the following:
The dog local variable =5.0
The dog field = 2
An Illustration of Inheritance in Java
To make some of the notions above about inheritance and polymorphism more
concrete, let us consider some simple examples in Java.
In particular, we consider a series of several classes for stepping through and
printing out numeric progressions. A numeric progression is a sequence of
numbers, where each number depends on one or more of the previous numbers.
For example, an arithmetic progression determines the next number by addition
and a geometric progression determines the next number by multiplication. In
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