Java

OOP GUIDE / WORK

DURATION CLASS 2 SOLUTIONS

TASK – PART 1 – SETUP

No solution required.

TASK – PART 2 – PRIVATE METHOD (SIMPLIFY)

Here is my solution:

public class Duration

{

private int hours;

private int minutes;

private int seconds;

public Duration(int h, int m, int s)

{

hours = h;

minutes = m;

seconds = s;

simplify();

}

public Duration(int m, int s)

{

hours = 0;

minutes = m;

seconds = s;

simplify();

}

public Duration(int s)

{

hours = 0;

minutes = 0;

seconds = s;

simplify();

}

public int getTotalSeconds()

{

return hours * 3600 + minutes * 60 + seconds;

}

public String toString()

{

return hours + "h" + minutes + "m" + seconds + "s";

}

private void simplify()

{

while (seconds >= 60)

{

seconds = seconds - 60;

minutes++;

}

while (minutes >= 60)

{

minutes = minutes - 60;

hours++;

}

}

}

TASK – PART 3 – TESTING YOUR SIMPLIFY METHOD

My solution is below. Remember that we do not need to call simplify ourselves here. It is automatically being called in the constructors.

public class DurationTester

{

public static void main(String[] args)

{

Duration d1 = new Duration(2, 61, 5);

System.out.println(d1);

Duration d2 = new Duration(1, 5, 155);

System.out.println(d2);

Duration d3 = new Duration(1, 62, 121);

System.out.println(d3);

}

}

The above outputs:

3h1m5s

1h7m35s

2h4m1s