Question

Consider that time could be internally represented as 3 integers.

• hour (between 0 - 23)
• minute (between 0 - 59)
• second (between 0 - 59)

MyTime class consists of the following members:

• Default constructor: set the time to 00:00:00
• Constructor taking 3 integers i.e., hour, minute and second respectively. This constructor sets this object's Time based on the given parameters.
• Constructor taking 2 integers i.e., hour and minute respectively. This constructor sets this object's hour and minute based on the given parameters. Second will be 0 by default.
• Constructor taking 1 integer i.e., hour. This constructor sets this object's hour based on the given parameter. Minute and second will be 0 by default.
• Accessors (getter) for each field.
• Mutators (setter) for each field. Make sure that each field is set within its proper ranges.
• to12HourFormat() method
  Returns the string representation of this Time object in 12-hour format.
  For instance, if the time is 13:05:58 in 24-hour format, it returns "01:05:58 PM".
  If the time is "12:05:14", it returns "12:05:14 PM".
  If the time is "00:00:00", it returns "12:00:00 AM".
• toString() method
  Returns the string representation of time in 24-hour format i.e., HH:MM:SS
  For instance, 13:05:58

Complete the MyTime class definition and write a main program to test your class in Java.

Answer 1

Output:

Code:

import java.io.*;

class MyTime {
  
    //instance variables
    private int hour;
    private int minute;
    private int second;
  
    //default constructor
    MyTime(){
        hour = 0;
        minute = 0;
        second = 0;
    }
  
    //parametrized constructors
    MyTime(int hour, int minute, int second){
        this.setHour(hour);
        this.setMinute(minute);
        this.setSecond(second);
    }
    MyTime(int hour, int minute){
        this.setHour(hour);
        this.setMinute(minute);
        second = 0;
    }
    MyTime(int hour){
        this.setHour(hour);
        minute = 0;
        second = 0;
    }
  
    //getters
    int getHour(){
        return hour;
    }
    int getMinute(){
        return minute;
    }
    int getSecond(){
        return second;
    }
  
    //setters
    //if there is error in value default value is set
    void setHour(int hour){
        if(hour<0 || hour>23)
            this.hour = 0;
        else
            this.hour = hour;
    }
    void setMinute(int minute){
        if(minute<0 || minute>59)
            this.minute = 0;
        else
            this.minute = minute;
    }
    void setSecond(int second){
        if(second<0 || second>59)
            this.second = 0;
        else
            this.second = second;
    }
  
    //12-hour Format
    String to12HourFormat(){
        int h = hour; //modified hour
        boolean am = (hour>=12) ? false : true; //am or pm
        if(hour==0)
            h=12;
        else if(hour>12){
            h = hour - 12;
        }
        MyTime newTime = new MyTime(h, minute, second);
        String result = newTime.toString();
        if(am==true)
            result += " AM";
        else
            result += " PM";
        return result;
    }
  
    public String toString(){
        String time = "";
        if(hour<10) time += "0";
        time += hour+":";
        if(minute<10) time += "0";
        time += minute+":";
        if(second<10) time += "0";
        time += second;
        return time;
    }
  
    //main function to test
   public static void main (String[] args) {
      
       MyTime ob1 = new MyTime(5,36,52);
       MyTime ob2 = new MyTime(23,65,46);
       MyTime ob3 = new MyTime(12,56,23);
       MyTime ob4 = new MyTime(0,46,28);
       MyTime ob5 = new MyTime(13);
       MyTime ob6 = new MyTime(6,28);
      
       System.out.println(ob1);
       System.out.println(ob2.to12HourFormat());
       System.out.println(ob3.to12HourFormat());
       System.out.println(ob4.to12HourFormat());
       System.out.println(ob5);
       System.out.println(ob6);
   }
}