Question

Write a class called Time that represents the time of the 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.

• Write a default constructor that initializes the time to 0 hours and 0 minutes.
• Write a private method isValid(hour, minute) that returns true if the given hour and minute values are in the appropriate range.
• Write a method setTime(hour, minute) that sets the time if the given values are valid.
• 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.
• Add two more constructors that are similar to the setTime methods described.
• Add a method getTime24 that returns a string that gives the time 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”.
• Add a method getTime12 returns a string that gives the time in 12-hour notation h:mm xx. For example
  • If the 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”.

Write a driver program to test your class and call it  testTime.. Make sure to test all the methods

Use JavaScript language

Answer 1

class Time{
    private int hour,minute;
    
    private boolean isValid(int hour,int minute){
        return hour>=0 && hour<24 && minute>=0 && minute<60; 
    }
    
    public Time(){
        this.hour=0;
        this.minute=0;
    }
    
    public Time(int hour,int minute){
        if (isValid(hour,minute)){
            this.hour=hour;
            this.minute=minute;
        } 
        else
            System.out.println("Invalid Time");
    }
    
    public Time(int hour,int minute,boolean isAM){
        if(hour>0 && hour<=12 && minute>=0 && minute<60){
            if(hour==12){
                hour=0;
            }
            if(!isAM){
                hour+=12;
            }
            this.hour=hour;
            this.minute=minute;
        }
        else 
            System.out.println("Invalid Time");
    }   
    
    public void setTime(int hour,int minute){
        if (isValid(hour,minute)){
            this.hour=hour;
            this.minute=minute;
        } 
        else
            System.out.println("Invalid Time");
    }   
    
    public void setTime(int hour,int minute,boolean isAM){
        if(hour>0 && hour<=12 && minute>=0 && minute<60){
            if(hour==12){
                hour=0;
            }
            if(!isAM){
                hour+=12;
            }
            this.hour=hour;
            this.minute=minute;
        }
        else 
            System.out.println("Invalid Time");
    }  
    public String getTime24(){
        String s="";
        if(hour<10)
            s+='0';
        s+=hour;
        if(minute<10)
            s+=0;
        s+=minute;
        return s;
    }
    public String getTime12(){
        boolean isAM=true;
        int h=hour;    //declared a variabe h to store hours so that we can change the hours inside the function and not change the value of the object
        if(h==0){
            h=12;
        }
        if(h>12){
            h-=12;
            isAM=false;
        }
        String s="";
        if(h<10)
            s+='0';
        s+=h;
        s+=':';
        if(minute<10)
            s+='0';
        s+=minute;
        if(isAM)
            s+=" AM";
        else
            s+=" PM";
        return s;
    }
}
public class TestTime 
{
        public static void main(String[] args) {
                Time t=new Time();
                t.setTime(16,34);
                System.out.println(t.getTime12());
                System.out.println(t.getTime24());
                t.setTime(4,34,false);
                System.out.println(t.getTime12());
                System.out.println(t.getTime24());
                
                t=new Time(13,43);
                System.out.println(t.getTime24());
                System.out.println(t.getTime12());
                
                t=new Time(7,45,true);
                System.out.println(t.getTime24());
                System.out.println(t.getTime12());
                
        }
}