Java Reference
In-Depth Information
Self-Test Exercises
20. Would the following invocation of
getAmount
in the method
getBalance
of
the outer class
BankAccount
still be legal if we change the method
getAmount
of the inner class
Money
from
public
to
private
?
public
String getBalance()
{
return
balance.getAmount();
}
21. Because it does not matter if we make the members of a private inner class
public or private, can we simply omit the
public
or
private
modifi ers from
the instance variables and methods of a private inner class?
22. Would it be legal to add the following method to the inner class
Money
in
Display 13.9 ? Remember, the question is would it be legal, not would it be sensible.
public void
doubleBalance()
{
balance.addIn(balance);
}
23. Would it be legal to add the following method to the inner class
Money
in
Display 13.9? Remember, the question is would it be legal, not would it
be sensible.
public void
doubleBalance2()
{
makeDeposit(balance.getAmount());
}
The
.class
File for an Inner Class
When you compile any class in Java, it produces a
.class
file. When you
compile a class with an inner class, this compiles both the outer class and the
inner class and produces two
.class
files. For example, when you compile
the class
BankAccount
in Display 13.9, this produces the following two
.class
files:
BankAccount.class
and
BankAccount$Money.class
If
BankAccount
had two inner classes, then three
.class
files would be produced.
