Defining Classes I - Java - page 239

5. public double fractionDone ( int targetDay)
{
double doubleDay = day;
return doubleDay/targetDay;
}

6. public void advanceYear ( int increase)
{
year = year + increase;
}

7. The instances of newMonth that have their values changed to 6 are indicated in

color below:

public void setDate( int newMonth, int newDay, int newYear)
{
month = monthString( newMonth );
day = newDay;
year = newYear;
System.out.println("Date changed to "
+ newMonth + " " + newDay + ", " + newYear);
}

The point being emphasized here is that all instances of newMonth have their
values changed to 6. Technically speaking, the parameter newMonth is a local
variable. So, there is only one local variable named newMonth whose value is
changed to 6 , but the net effect, in this case, is the same as replacing all
occurrences of newMonth with 6 .
8. Yes, it is legal. The point being emphasized here is that the parameter count is a
local variable and so can have its value changed, in this case by the decrement
operator.
9. Each case has a return statement. A return statement always ends the method
invocation, and hence ends the execution of the switch statement. So, a break
statement would be redundant.
10. They are assumed to be instance variables of the calling object.
11. public int getDay()
{
return this .day;
}

public int getYear()
{
return this .year;
}