USER-DEFINED CLASSES AND ADTS - Java Programming: From Problem Analysis to Program Design - page 486

The definition of the method getCopy can also be written as:

public Clock getCopy()
{

Clock temp = new Clock(hr, min, sec);

return temp;

}

This definition of the method getCopy uses the constructor with parameters, described
below, to initialize the instance variables of the object temp .

Next, we give the definitions of the constructors. The default constructor initializes each
instance variable to 0 . Its definition is:
public Clock()
{

hr = 0;
min = 0;
sec = 0;

}
You can also write the definition of the default constructor using the method setTime as
follows:
public Clock()
{

setTime(0, 0, 0);

}
The definition of the constructor with parameters is the same as the definition of the
method setTime . It initializes the instance variables to the values specified by the user. Its
definition is:

public Clock( int hours, int minutes, int seconds)
{

if (0 <= hours && hours < 24)
hr = hours;
else
hr = 0;

if (0 <= minutes && minutes < 60)
min = minutes;
else
min = 0;

if (0 <= seconds && seconds < 60)
sec = seconds;
else
sec = 0;

}