Design a class named Time. The class contains: - The data fields hour, minute, and second that represent a time. - A no-arg constructor that creates a Time object for the current time. (The values of the data fields will represent the current time.) - A constructor that constructs a Time object with a specified elapsed time since midnight, January 1, 1970, in milliseconds. (The values of the data fields will represent this time.) - A constructor that constructs a Time object with the specified hour, minute, and second. - Three getter methods for the data fields hour, minute, and second, respectively. - A method named setTime(long elapseTime)that sets a new time for the object using the elapsed time. For example, if the elapsed time is 555550000 milliseconds, the hour is 10, the minute is 19, and the second is10. Draw the UML diagram for the class and then implement the class. Write a test program that creates two Timeobjects (using new Time(), new Time(555550000), and new Time(5, 23, 55))and displays their hour, minute, and second in the format hour:minute:second. (Hint: The first two constructors will extract the hour, minute, and second from the elapsed time. For the no-arg constructor, the current time can be obtained using System.currentTimeMillis(), as shown in LiveExample 2.7, ShowCurrentTime.java.) Class Name: Exercise10_01

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public class Time { private int hour; private int minute; private int second; public Time() { Calendar calendar = new GregorianCalendar(); this.hour = calendar.get(Calendar.HOUR_OF_DAY); this.minute = calendar.get(Calendar.MINUTE); this.second = calendar.get(Calendar.SECOND); } public Time(long elapsedTime) { Calendar calendar = new GregorianCalendar(); calendar.setTimeInMillis(elapsedTime); this.hour = calendar.get(Calendar.HOUR_OF_DAY); this.minute = calendar.get(Calendar.MINUTE); this.second = calendar.get(Calendar.SECOND); } public Time(int hour, int minute, int second) { this.hour = hour; this.minute = minute; this.second = second; } public int getHour() { return this.hour; } public int getMinute() { return this.minute; } public int getSecond() { return this.second; }

public void setTime(long elapsedTime) { Calendar calendar = new GregorianCalendar(); calendar.setTimeInMillis(elapsedTime); this.hour = calendar.get(Calendar.HOUR_OF_DAY); this.minute = calendar.get(Calendar.MINUTE); this.second = calendar.get(Calendar.SECOND); } } public class Exercise10_01 { public static void main(String[] args) { Time t1 = new Time(); Time t2 = new Time(555550000); Time t3 = new Time(5, 23, 55);

System.out.println("t1 hour:minute:second: " + t1.getHour() + ":" + t1.getMinute() + ":" + t1.getSecond()); System.out.println("t2 hour:minute:second: " + t2.getHour() + ":" + t2.getMinute() + ":" + t2.getSecond()); System.out.println("t3 hour:minute:second: " + t3.getHour() + ":" + t3.getMinute() + ":" + t3.getSecond()); } }