Problem 1 (Java) Consider a class Time that represents a time of day. It has att
ID: 3678223 • Letter: P
Question
Problem 1 (Java)
Consider a class Time that represents a time of day. It has attributes for the hour and minute. The hour value ranges from 0 to 23, where the range 0 to
11 represents a time before noon.The minute value ranges from 0 to 59. Use the provided Time.java as a starting point– do not change the unittests (main
()and the private utility methods followingmain()).
a.Write three constructors: default constructor and two other constructors. A defaultconstructor initializes the time to 0 hours, 0 minutes. Another
two constructors are analogous to the setTime() methods described in Parts c and d.
b.Write a private method isValid(hour, minute) that returns true if the given hour and minute values are in the appropriate range.
c.Write a method setTime(hour, minute) that sets the time if the given values are valid.Valid hour value ranges from 0 to 23. Valid minute value ranges from 0 to 59.
d.Write another method setTime(hour, minute, isAm ) that sets the time if the given values are valid.The given hour should be in the range 1 to 12.
The parameter isAm is true if the time is an a. m. time and false otherwise.
e.Write a method getTime24() that returns a string in 24-hour notation hhmm. For example, if the hour value is 7 and the minute value is 25, return "0725".
If the hour value is 0 and the minute value is 5, return "0005".If the hour value is 15 and the minute value is 30, return"1530".
f. Write a method getTime12() that returns a string in 12-hour notation h:mm xx. For example, ifthe hour value is 7 and the minute value is 25, return "7:25 am".If the hour
value is 0 and the minute value is 5, return "12:05 am".If the hour value is 15 and the minute value is 30, return "3:30 pm"
Notes:
•You may not use any Java library classes (Date, Time, etc) to manipulate the time.
•You must use exactly 2 instance variables (int hours; int minutes) –you may not have an instance variable to indicate am/pm.-> you always store time in -hour format.
Complete the class Time, write a basic set of unit tests in the main()method within the Time class, and write an interactive program (separate classTestTime) to use your Time class. Your program must prompt for 12- or 24-hour input format or to quit. If 12-hour format is chosen, prompt for hours, minutes, and am or pm, then invoke the 3 parameter version of setTime(). If 24-hour format is chosen, prompt for hours and minutes, then invoke the 2 parameter version of setTime(). Display the time in both 12- and 24-hour formats. Repeat. You must use a switch() statement as the dispatcher to handle the first prompt (12-hour, 24-hour, quit).
Example of expected output (partial):
Valid test: new Time()
Expect: (0, 0) 0000 12:00 am
Actual: (0, 0) 0000 12:00 am
Valid test: new Time( 0, 0 )
Expect: (0, 0) 0000 12:00 am
Actual: (0, 0) 0000 12:00 am
Error test: new Time( -1, 1 )
Expect: (0, 0) 0000 12:00 am
Actual: (0, 0) 0000 12:00 am
Comments: Please provide some comment of the code.
Explanation / Answer
public class Time
{
private int hour;
private int minute;
public Time()
//default constructor initializing time to 0 hours, 0 minutes
{
hour = 0;
minute = 0;
}
private boolean isValid(hour,minute)
//returns true if given hour & minute values are of range
{
if(hour >= 0 && hour <= 23) && (minute >= 0 && minute <=59))
{
return true;
}
else
{
return false;
}
}
public void setTime(hour,minute){
//set time if given values are valid
boolean result=isValid(hour,minute);
if(result==true){
System.out.println("Entered hour and minitue : "+hour+" "+miniute);
}else{
System.out.println("you are entered wrong values of hour and minitue");
}
}
public void setTime(hour,minute,isAM)
//sets time if given values are valid
//hour range: 1 to 12
//parameter isAM true if the time is an a.m. time, otherwise false
{
boolean result=isValid(hour,minute);
if(result==true){
isAm:true;
System.out.println("Entered hour and minitue : "+hour+" "+miniute+" "+isAm);
}else{
System.out.println("you are entered wrong values of hour and minitue");
}
}
}
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