Need major help please?

Question

hello, i made the class and i believe its right.. well i thought it was right but wheni test the methods in my main it does not output what it should. for example if the time is 13 o clock it should go to one o clock. i think the problem is either in my class or im not testing it right. please help.
CLASS=
public class Clock
     //private data
    private int hours;
    private int minutes;
    private int seconds;
    //constructors
    public Clock()
        hours = 0;
        minutes = 0;
        seconds = 0;
    public Clock (int h, int m, int s)
        hours = h;
        minutes = m;
        seconds = s;
    //accessor methods
    public int getHours()
        return hours;
    public int getMinutes()
        return minutes;
    public int getSeconds()
        return seconds;
    //methods
    public String toString()
        String str;
        str = hours + " : " + minutes + " : " +seconds;
        return str;
    public void addHours(int h)
         if ((h > 0 ) && (h <= 12))
              hours = h;
         else
              hours = 0;
    public void addMinutes(int m)
         if ((m > 0 ) && (m <= 59))
              minutes = m;
         else
              minutes = 0;
    public void addSeconds(int s)
         if ((s > 0 ) && (s <= 59))
              seconds = s;
         else
              seconds = 0;
    public void setTime(int h, int m, int s)
         hours = h;   
         minutes = m;
         seconds = s; 
}MAIN=
// import statements
import javax.swing.*;
public class Clockclass
     public static void main(String args[])
     Clock noon = new Clock (11, 25, 54);
     Clock noclock = new Clock ();
     Clock morning = new Clock(5, 15, 36);
     Clock night = new Clock(7, 12, 15);
     System.out.println( noclock );
     System.out.println( noon );
     System.out.println(noon.getHours());
     System.out.println(noon.getMinutes());
     System.out.println(noon.getSeconds());
     System.out.println("noon time is: " + noon.toString());
     System.out.println(night);
     night.addHours(6);
     System.out.println(night);
     noclock.setTime(11,30,45);
     System.out.println( noclock );
     System.exit(0);
}

Answer 1

i add it in my to String
    //methods
    public String toString()
        String str; 
        String h1=" ",m1=" ",s1=" ";
        if (hours < 10)
             h1="0";
        else
             h1="";
        if (minutes < 10)
             m1= "0";
          else
               m1 = "";
          if (seconds < 10)
               s1 = "0";
          else
               s1 = " ";
        str = h1 + hours + " : " + m1 + minutes + " : " + s1 +seconds;
        return str;
    }