The class Clock given only allows the time to be incremented by one second, one

Question

The class Clock given only allows the time to be incremented by one second, one minute, or one hour. Rewrite the definition of the class Clock by including additional members so that time can also be decremented by one second, one minute, or one hour.

public class Clock
{
private int hr; //store hours
private int min; //store minutes
private int sec; //store seconds


//Default constructor
//Postcondition: hr = 0; min = 0; sec = 0
public Clock()
{
setTime(0, 0, 0);
}

//Constructor with parameters, to set the time
//The time is set according to the parameters
//Postcondition: hr = hours; min = minutes; sec = seconds
public Clock(int hours, int minutes, int seconds)
{
setTime(hours, minutes, seconds);
}

//Method to set the time
//The time is set according to the parameters
//Postcondition: hr = hours; min = minutes; sec = seconds
public void setTime(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;
}

//Method to return the hours
//Postcondition: The value of hr is returned.
public int getHours()
{
return hr;
}

//Method to return the minutes
//Postcondition: The value of min is returned.
public int getMinutes()
{
return min;
}

//Method to return the seconds
//Postcondition: The value of sec is returned.
public int getSeconds()
{
return sec;
}

//Method to print the time
//Postcondition: Time is printed in the form hh:mm:ss
public void printTime()
{
if (hr < 10)
System.out.print("0");
System.out.print(hr + ":");

if (min < 10)
System.out.print("0");
System.out.print(min + ":");

if (sec < 10)
System.out.print("0");
System.out.print(sec);
}

//Method to increment the time by one second
//Postcondition: The time is incremented by one second
//If the before-increment time is 23:59:59, the time
//is reset to 00:00:00.
public void incrementSeconds()
{
sec++;

if (sec > 59)
{
sec = 0;
incrementMinutes(); //increment minutes
}
}

//Method to increment the time by one minute
//Postcondition: The time is incremented by one minute.
//If the before-increment time is 23:59:53, the time
//is reset to 00:00:53.
public void incrementMinutes()
{
min++;

if (min > 59)
{
min = 0;
incrementHours(); //increment hours
}
}

//Method to increment the time by one hour
//Postcondition: The time is incremented by one hour.
//If the before-increment time is 23:45:53, the time
//is reset to 00:45:53.
public void incrementHours()
{
hr++;

if (hr > 23)
hr = 0;
}

//Method to compare the two times
//Postcondition: Returns true if this time is equal to
// otherClock; otherwise returns false.
public boolean equals(Clock otherClock)
{
return (hr == otherClock.hr
&& min == otherClock.min
&& sec == otherClock.sec);
}

//Method to copy the time
//Postcondition: The instance variables of otherClock are
// copied into the corresponding data members
// of this time.
// hr = otherClock.hr; min = otherClock.min;
// sec = otherClock.sec.
public void makeCopy(Clock otherClock)
{
hr = otherClock.hr;
min = otherClock.min;
sec = otherClock.sec;
}

//Method to return a copy of the time
//Postcondition: A copy of the object is created
// and a reference of the copy is returned.
public Clock getCopy()
{
Clock temp = new Clock();

temp.hr = hr;
temp.min = min;
temp.sec = sec;

return temp;
}
}

Explanation / Answer

}

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