Java 6 Illuminated: An Active Learning Approach, 2nd Edition

10.2.1 Inherited Members of a Class

As shown in Example 10.1, our BankAccount class has two instance vari-

ables, the balance, which is a double (line 11), and a constant DecimalFor-

mat object that we will use for formatting the balance as money (lines

9–10). We provide two constructors. The default constructor (lines 13–19)

sets the balance instance variable to 0.0. The overloaded constructor (lines

21–27) takes a starting balance and passes that parameter to the deposit

method (lines 37–47), which adds any non-negative starting balance to the

balance. If the starting balance is less than 0.0, the deposit method prints an

error message and leaves ...