Object-Oriented Design - Java Software Solutions: Foundations of Program Design - page 345

We often use a println statement that prints several distinct types, such as:
System.out.println ("Number of students: " + count);
Remember, in this case the plus sign is the string concatenation operator. First,
the value in the variable count is converted to a string representation, then the
two strings are concatenated into one longer string, and finally the definition of
println that accepts a single string is invoked.
Constructors can be overloaded, and often are. By providing multiple versions
of a constructor, we provide multiple ways to set up an object.
SELF-REVIEW QUESTIONS (see answers in Appendix N)
SR 7.22 How are overloaded methods distinguished from each other?
SR 7.23 For each of the following pairs of method headers, state whether or
not the signatures are distinct. If not, explain why not.
a. String describe (String name, int count)
String describe ( int count, String name)
b. void count ( )
int count ( )
c. int howMany ( int compareValue)
int howMany ( int ceiling)
d. boolean greater ( int value1)
boolean greater ( int value1, int value2)
SR 7.24 The Num class is defined in Section 7.7. Overload the constructor of
that class by defining a second constructor which takes no parameters
and sets the value attribute to zero.
7.9 Testing
The term testing can be applied in many ways to software development. Testing
certainly includes its traditional definition: the act of running a completed pro-
gram with various inputs to discover problems. But it also includes any evalua-
tion that is performed by human or machine to assess the quality of the evolving
system. These evaluations should occur long before a single line of code is written.
The goal of testing is to find errors. By finding errors and fixing them, we
improve the quality of our program. It's likely that later on someone else will
find any errors that remain hidden during development. The earlier the errors are
found, the easier and cheaper they are to fix. Taking the time to uncover problems
as early as possible is almost always worth the effort.