Create a class called time that includes three instance variables— hours (type int), minutes (type int) and seconds (type int). provide a constructor that initializes the three instance variables. provide a set and a get method for each instance variable. provide a method displaytime that displays the hours, minutes and seconds separated by colons (: ). write a test application named timetest that demonstrates class time’s capabilities. (the numbers should be valid for hours, minutes, seconds, assume 24hrs display.) ex: 78: 23: 99 is not valid., 18: 25: 55 is valid,

The program to this question can be given as follows:

Program:

import java.util.*; //import package

class Time //defining class Time

{

int hours,minutes,seconds; //defining integer variable

Time(int hours, int minutes, int seconds)//defining parameterized constructor  

{

//using this keyword

this.hours = hours;  //holding a value

this.minutes = minutes; //holding a value

this.seconds = seconds; //holding a value

}

int getHours() //defining method getHours

{

return hours; //return value

}

void setHours(int hours) //defining method setHours

{

this.hours = hours; //holing a value in hours variable

}

int getMinutes() //defining method getMinutes

{

return minutes;  //return value

}

void setMinutes(int minutes) //defining method setMinutes

{

this.minutes = minutes; //holing a value in minutes variable

}

int getSeconds() //defining method getSeconds

{

return seconds; //return value

}

void setSeconds(int seconds)  //defining method setSeconds

{

this.seconds = seconds; //holing a value in seconds variable

}

void displayTime()  //defining method displayTime

{

System.out.println(hours + ":" + minutes + ":" + seconds); //print the value

}

}

public class TimeTest //defining class TimeTest

{

public static void main(String[] args) //defining main method

{

int h, m, s; //defining integer variable

Scanner ob1= new Scanner(System.in); //creating Scanner class Object

System.out.print("Enter number of hours: "); //message

h = ob1.nextInt(); //input value by user

System.out.print("Enter number of minutes: "); //message

m = ob1.nextInt(); //input value by user

System.out.print("Enter number of seconds: "); //message

s = ob1.nextInt(); //input value by user

//using conditional statement

if(h < 0 || m < 0 || s < 0 || h > 23 || m > 59 || s > 59) //checking value

{

System.out.println("Invalid input. please Try again!"); //message

}

else

{

Time t = new Time(h, m, s);  //creating Time class object

t.displayTime(); //calling displayTime method

}

}

}

Output:

Enter number of hours: 12

Enter number of minutes: 22

Enter number of seconds: 50

12:22:50

Explanation:

In the above java code, two class "Time and TimeTest" is defined, in the time class three integer variable "hours, minutes, and seconds" is defined, which use in the parameterized constructor with this keyword to hold constructor parameters value.

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