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‎08.5-Modifying-the-Internal-Data-Representation-of-Class/Main.java‎

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// Fig. 8.6: Time2Test.java
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// Overloaded constructors used to initialize Time2 objects.
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public class Main
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{
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public static void main(String[] args)
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{
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Time2 t1 = new Time2(); // 00:00:00
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Time2 t2 = new Time2(2); // 02:00:00
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Time2 t3 = new Time2(21, 34); // 21:34:00
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Time2 t4 = new Time2(12, 25, 42); // 12:25:42
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Time2 t5 = new Time2(t4); // 12:25:42
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System.out.println("Constructed with:");
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displayTime("t1: all default arguments", t1);
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displayTime("t2: hour specified; default minute and second", t2);
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displayTime("t3: hour and minute specified; default second", t3);
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displayTime("t4: hour, minute and second specified", t4);
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displayTime("t5: Time2 object t4 specified", t5);
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// attempt to initialize t6 with invalid values
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try
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{
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Time2 t6 = new Time2(27, 74, 99); // invalid values
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}
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catch (IllegalArgumentException e)
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{
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System.out.printf("%nException while initializing t6: %s%n",
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e.getMessage());
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}
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}
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// displays a Time2 object in 24-hour and 12-hour formats
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private static void displayTime(String header, Time2 t)
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{
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System.out.printf("%s%n %s%n %s%n",
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header, t.toUniversalString(), t.toString());
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}
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} // end class Time2Test
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/**************************************************************************
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* (C) Copyright 1992-2014 by Deitel & Associates, Inc. and *
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* Pearson Education, Inc. All Rights Reserved. *
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* *
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* DISCLAIMER: The authors and publisher of this book have used their *
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* best efforts in preparing the book. These efforts include the *
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* development, research, and testing of the theories and programs *
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* to determine their effectiveness. The authors and publisher make *
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* no warranty of any kind, expressed or implied, with regard to these *
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* programs or to the documentation contained in these books. The authors *
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* and publisher shall not be liable in any event for incidental or *
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* consequential damages in connection with, or arising out of, the *
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* furnishing, performance, or use of these programs. *
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*************************************************************************/

‎08.5-Modifying-the-Internal-Data-Representation-of-Class/Time2.java‎

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// Fig. 8.5: Time2.java
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// Time2 class declaration with overloaded constructors.
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public class Time2
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{
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private int secondsAfterMidnight;
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// Time2 no-argument constructor:
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// initializes each instance variable to zero
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public Time2()
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{
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secondsAfterMidnight = 0;
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}
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// Time2 constructor: hour supplied, minute and second defaulted to 0
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public Time2(int hour)
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{
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setTime(hour, 0, 0); // invoke constructor with three arguments
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}
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// Time2 constructor: hour and minute supplied, second defaulted to 0
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public Time2(int hour, int minute)
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{
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setTime(hour, minute, 0); // invoke constructor with three arguments
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}
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// Time2 constructor: hour, minute and second supplied
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public Time2(int hour, int minute, int second)
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{
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if (hour < 0 || hour >= 24)
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throw new IllegalArgumentException("hour must be 0-23");
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if (minute < 0 || minute >= 60)
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throw new IllegalArgumentException("minute must be 0-59");
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if (second < 0 || second >= 60)
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throw new IllegalArgumentException("second must be 0-59");
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setTime(hour, minute, second);
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}
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// Time2 constructor: another Time2 object supplied
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public Time2(Time2 time)
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{
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// invoke constructor with three arguments
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setTime(time.getHour(), time.getMinute(), time.getSecond());
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}
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// Set Methods
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// set a new time value using universal time;
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// validate the data
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public void setTime(int hour, int minute, int second)
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{
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if (hour < 0 || hour >= 24)
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throw new IllegalArgumentException("hour must be 0-23");
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if (minute < 0 || minute >= 60)
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throw new IllegalArgumentException("minute must be 0-59");
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if (second < 0 || second >= 60)
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throw new IllegalArgumentException("second must be 0-59");
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setHour(hour);
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setMinute(minute);
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setSecond(second);
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}
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// validate and set hour
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public void setHour(int hour)
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{
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if (hour < 0 || hour >= 24)
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throw new IllegalArgumentException("hour must be 0-23");
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secondsAfterMidnight = (hour * 3600) + (getMinute() * 60) + getSecond();
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}
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// validate and set minute
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public void setMinute(int minute)
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{
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if (minute < 0 || minute >= 60)
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throw new IllegalArgumentException("minute must be 0-59");
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secondsAfterMidnight = (getHour() * 3600) + (minute * 60) + getSecond();
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}
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// validate and set second
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public void setSecond(int second)
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{
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if (second < 0 || second >= 60)
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throw new IllegalArgumentException("second must be 0-59");
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secondsAfterMidnight = (getHour() * 3600) + (getMinute() * 60) + second;
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}
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// Get Methods
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// get hour value
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public int getHour()
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{
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return (secondsAfterMidnight / 3600);
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}
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// get minute value
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public int getMinute()
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{
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return ((secondsAfterMidnight % 3600) / 60);
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}
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// get second value
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public int getSecond()
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{
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return ((secondsAfterMidnight % 3600) % 60);
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}
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// convert to String in universal-time format (HH:MM:SS)
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public String toUniversalString()
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{
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return String.format(
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"%02d:%02d:%02d", getHour(), getMinute(), getSecond());
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}
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// convert to String in standard-time format (H:MM:SS AM or PM)
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public String toString()
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{
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return String.format("%d:%02d:%02d %s",
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((getHour() == 0 || getHour() == 12) ? 12 : getHour() % 12),
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getMinute(), getSecond(), (getHour() < 12 ? "AM" : "PM"));
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}
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} // end class Time2
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/**************************************************************************
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* (C) Copyright 1992-2014 by Deitel & Associates, Inc. and *
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* Pearson Education, Inc. All Rights Reserved. *
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* *
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* DISCLAIMER: The authors and publisher of this book have used their *
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* best efforts in preparing the book. These efforts include the *
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* development, research, and testing of the theories and programs *
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* to determine their effectiveness. The authors and publisher make *
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* no warranty of any kind, expressed or implied, with regard to these *
139+
* programs or to the documentation contained in these books. The authors *
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* and publisher shall not be liable in any event for incidental or *
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* consequential damages in connection with, or arising out of, the *
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* furnishing, performance, or use of these programs. *
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*************************************************************************/

‎08.7-Enhancing-Class-Time/Main.java‎

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public class Main
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{
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public static void main( String args[] )
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{
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Time2 time = new Time2(22, 58, 58);
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System.out.println("Time: ");
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System.out.printf(" %s\n", time.toUniversalString());
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System.out.printf(" %s\n", time.toString());
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time.tick();
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System.out.println("add 1 second");
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System.out.printf(" %s\n", time.toString());
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time.incrementMinute();
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System.out.println("add 1 minute");
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System.out.printf(" %s\n", time.toString());
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time.incrementHour();
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System.out.println("add 1 hour");
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System.out.printf(" %s\n", time.toString());
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for (int i = 0; i <= 1; i++)
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time.tick();
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System.out.println("into the next day");
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System.out.printf(" %s\n", time.toString());
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}//end method main
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}//end class

‎08.7-Enhancing-Class-Time/Time2.java‎

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// Fig. 8.5: Time2.java
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// Time2 class declaration with overloaded constructors.
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public class Time2
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{
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private int hour; // 0 - 23
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private int minute; // 0 - 59
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private int second; // 0 - 59
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// Time2 no-argument constructor:
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// initializes each instance variable to zero
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public Time2()
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{
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this(0, 0, 0); // invoke constructor with three arguments
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}
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// Time2 constructor: hour supplied, minute and second defaulted to 0
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public Time2(int hour)
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{
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this(hour, 0, 0); // invoke constructor with three arguments
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}
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// Time2 constructor: hour and minute supplied, second defaulted to 0
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public Time2(int hour, int minute)
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{
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this(hour, minute, 0); // invoke constructor with three arguments
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}
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// Time2 constructor: hour, minute and second supplied
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public Time2(int hour, int minute, int second)
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{
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if (hour < 0 || hour >= 24)
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throw new IllegalArgumentException("hour must be 0-23");
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if (minute < 0 || minute >= 60)
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throw new IllegalArgumentException("minute must be 0-59");
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if (second < 0 || second >= 60)
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throw new IllegalArgumentException("second must be 0-59");
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setTime (hour, minute, second);
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}
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// Time2 constructor: another Time2 object supplied
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public Time2(Time2 time)
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{
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// invoke constructor with three arguments
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this(time.getHour(), time.getMinute(), time.getSecond());
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}
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// Set Methods
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// set a new time value using universal time;
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// validate the data
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public void setTime(int hour, int minute, int second)
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{
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if (hour < 0 || hour >= 24)
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throw new IllegalArgumentException("hour must be 0-23");
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if (minute < 0 || minute >= 60)
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throw new IllegalArgumentException("minute must be 0-59");
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if (second < 0 || second >= 60)
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throw new IllegalArgumentException("second must be 0-59");
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setHour(hour);
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setMinute(minute);
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setSecond(second);
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}
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// validate and set hour
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public void setHour(int hour)
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{
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if (hour < 0 || hour >= 24)
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throw new IllegalArgumentException("hour must be 0-23");
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this.hour = hour;
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}
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// validate and set minute
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public void setMinute(int minute)
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{
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if (minute < 0 || minute >= 60)
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throw new IllegalArgumentException("minute must be 0-59");
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this.minute = minute;
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}
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// validate and set second
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public void setSecond(int second)
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{
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if (second < 0 || second >= 60)
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throw new IllegalArgumentException("second must be 0-59");
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this.second = second;
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}
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// Get Methods
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// get hour value
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public int getHour()
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{
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return hour;
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}
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// get minute value
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public int getMinute()
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{
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return minute;
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}
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// get second value
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public int getSecond()
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{
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return second;
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}
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// Tick time
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public void tick()
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{
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setSecond(second +1);
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if(second == 0)
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incrementMinute();
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}
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public void incrementMinute()
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{
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setMinute(minute +1);
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if(minute == 0)
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incrementHour();
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}
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public void incrementHour()
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{
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setHour (hour +1);
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}
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// convert to String in universal-time format (HH:MM:SS)
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public String toUniversalString()
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{
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return String.format(
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"%02d:%02d:%02d", getHour(), getMinute(), getSecond());
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}
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// convert to String in standard-time format (H:MM:SS AM or PM)
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public String toString()
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{
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return String.format("%d:%02d:%02d %s",
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((getHour() == 0 || getHour() == 12) ? 12 : getHour() % 12),
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getMinute(), getSecond(), (getHour() < 12 ? "AM" : "PM"));
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}
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} // end class Time2
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/**************************************************************************
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* (C) Copyright 1992-2014 by Deitel & Associates, Inc. and *
156+
* Pearson Education, Inc. All Rights Reserved. *
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* *
158+
* DISCLAIMER: The authors and publisher of this book have used their *
159+
* best efforts in preparing the book. These efforts include the *
160+
* development, research, and testing of the theories and programs *
161+
* to determine their effectiveness. The authors and publisher make *
162+
* no warranty of any kind, expressed or implied, with regard to these *
163+
* programs or to the documentation contained in these books. The authors *
164+
* and publisher shall not be liable in any event for incidental or *
165+
* consequential damages in connection with, or arising out of, the *
166+
* furnishing, performance, or use of these programs. *
167+
*************************************************************************/

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