I am really having trouble with this 2 part question. I can\'t seem to get it to

Question

I am really having trouble with this 2 part question. I can't seem to get it to work.

Part 1
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.
a. Write a default constructor that initializes the time to 0 hours, 0 minutes.
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.

Part 2

Complete and fully test the class Time that Exercise 2 describes. Add two
more constructors that are analogous to the setTime methods described in
Parts c and d of Exercise 2. Also include the following methods:
getTime24 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".

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".

Explanation / Answer

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public class Time
{
    private int hour;
    private int minute;
    Time()
    {
        hour=0;
        minute=0;
    }
    private boolean isValid(int h,int m)
    {
        if(h>=0 && h<=23 && m>=0 && m<=59)return true;
        else return false;
    }
    public void setTime(int h,int m)
    {
        if(isValid(h,m))
        {
            hour=h;
            minute=m;
        }
    }
    public String getTime24()
    {
        String t;
        if(hour<=9)t="0"+hour;
        else t=""+hour;
        if(minute<=9)t=t+"0"+minute;
        else t=t+minute;
        return t;
    }
    public String getTime12()
    {
        String t;
        if(hour>12)t=""+(hour-12)+":";
        else t=""+hour+":";
        if(minute<=9)t=t+"0"+minute;
        else t=t+minute;
        if(hour<12)t=t+" am";
        else t=t+" pm";
        return t;
    }
}

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