Java program: Please ontinue my expansion of the Clock class (Clock.java) and dr
ID: 3763671 • Letter: J
Question
Java program:
Please ontinue my expansion of the Clock class (Clock.java) and driver program (TestClockProg.java) which was discussed in class to include methods such as:
sumClock.addTimes(myClock, yourClock)
and
diffClock.subTimes(myClock, yourClock) //This would be a method to subtract 2 clock times.
Many Thanks in advance!!
//class Clock
public class Clock
{
private int hr; //store hours
private int min; //store minutes
private int sec; //store seconds
//Postcondition: hr = 0; min = 0; sec = 0
public Clock()
{
setTime(0, 0, 0);
System.out.println("Inside the version with NO parameters!");
}
public Clock(int hours, int minutes, int seconds)
{
setTime(hours, minutes, seconds);
System.out.println("Inside the version with parameters!");
}
//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;
}
public String toString()
{
String str = "";
if (hr < 10)
str = "0";
str = str + hr + ":";
if (min < 10)
str = str + "0" ;
str = str + min + ":";
if (sec < 10)
str = str + "0";
str = str + sec;
return str;
}
public void addTimes(Clock a, Clock b)
{
hr=7;
min=7;
sec=7;
}
}
//Program to test the various operations of the class Clock
import java.util.*;
public class TestProgClock
{
static Scanner console = new Scanner(System.in);
public static void main(String[] args)
{
Clock myClock = new Clock(5, 4, 30); //Line 1
Clock yourClock = new Clock(0,0,0); //Line 2
Clock sumClock = new Clock(0,0,0); //Line 2
int hours; //Line 3
int minutes; //Line 4
int seconds; //Line 5
System.out.print("Line 6: myClock: "); //Line 6
myClock.printTime(); //Line 7
System.out.println(); //Line 8
System.out.print("Line 9: yourClock: "); //Line 9
yourClock.printTime(); //Line 10
System.out.println(); //Line 11
yourClock.setTime(5, 45, 16); //Line 12
System.out.print("Line 13: After setting "
+ "the time, yourClock: "); //Line 13
yourClock.printTime(); //Line 14
System.out.println(); //Line 15
if (myClock.equals(yourClock)) //Line 16
System.out.println("Line 17: Both the "
+ "times are equal."); //Line 17
else //Line 18
System.out.println("Line 19: The two "
+ "times are not "
+ "equal."); //Line 19
System.out.print("Line 20: Enter the hours, "
+ "minutes, and seconds: "); //Line 20
hours = console.nextInt(); //Line 21
minutes = console.nextInt(); //Line 22
seconds = console.nextInt(); //Line 23
System.out.println(); //Line 24
myClock.setTime(hours, minutes, seconds); //Line 25
System.out.print("Line 26: New time of "
+ "myClock: "); //Line 26
myClock.printTime(); //Line 27
System.out.println(); //Line 28
myClock.incrementSeconds(); //Line 29
System.out.print("Line 30: After "
+ "incrementing the time by "
+ "one second, myClock: "); //Line 30
myClock.printTime(); //Line 31
System.out.println(); //Line 32
yourClock.makeCopy(myClock); //Line 33
System.out.print("Line 34: After copying "
+ "myClock into yourClock, "
+ "yourClock: "); //Line 34
yourClock.printTime(); //Line 35
System.out.println(); //Line 36
System.out.println("Myclock = " + myClock); //Line 36
sumClock.addTimes(myClock,yourClock);
System.out.println("sumClock = " + sumClock);
}//end main
}
Explanation / Answer
public class Clock
{
private int hr; //store hours
private int min; //store minutes
private int sec; //store seconds
public Clock ()
{
setTime (0, 0, 0);
}
public Clock (int hours, int minutes, int seconds)
{
setTime (hours, minutes, 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
public int getHours ( )
{
return hr;
}
//Method to return the minutes
public int getMinutes ( )
{
return min;
}
//Method to return the seconds
public int getSeconds ( )
{
return sec;
}
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);
}
//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
}
}
///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
}
}
public void incrementHours ( )
{
hr++;
if (hr > 23)
hr = 0;
}
public boolean equals (Clock otherClock)
{
return (hr == otherClock.hr
&& min == otherClock.min
&& sec == otherClock.sec);
}
}
public class ClockDriver
{
public static void main(String[] args)
{
Clock test = new Clock();
test.setTime(x, x, x);
System.out.printf("The time is: ", test.getHours(), test.getMinutes(), test.getSeconds());
}
}
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