Object-Oriented Design - Java Software Solutions: Foundations of Program Design - page 309

LISTING 7.2 continued

//-----------------------------------------------------------------
// Constructor: Sets up the slogan and counts the number of
// instances created.
//-----------------------------------------------------------------
public Slogan (String str)
{
phrase = str;
count++;
}

//-----------------------------------------------------------------
// Returns this slogan as a string.
//-----------------------------------------------------------------
public String toString()
{
return phrase;
}

//-----------------------------------------------------------------
// Returns the number of instances of this class that have been
// created.
//-----------------------------------------------------------------
public static int getCount ()
{
return count;
}
}

SELF-REVIEW QUESTIONS (see answers in Appendix N)
SR 7.6 What is the difference between a static variable and an instance variable?

SR 7.7 Assume you are defining a BankAccount class whose objects each

represent a separate bank account. Write a declaration for a variable
of the class that will hold the combined total balance of all the bank
accounts represented by the class.

SR 7.8 Assume you are defining a BankAccount class whose objects each represent

a separate bank account. Write a declaration for a variable of the class that
will hold the minimum balance that each account must maintain.

SR 7.9 What kinds of variables can the main method of any program refer-

ence? Why?