Very simple question from a beginner

I am currently doing a little exercise, but I ran into a problem. I have written a class that supports operations on rational number. The fields are two long variables, one each that stores the numerator and denominator.
I have made add, subtract, multiply, and divide methods...
1. what I need help in is: beingh able to store the rational number in reduced for, with the denominator always positive
2. constructing a toString method, equals method, and compareTo method.
3. it also says "make sure the toString method correctly handles the case in which the denominator is zero by throwing an exception.
I have been working on this for a long time now, an I am stuck at this point.
I know this will be very simple for you guys and gals, but I am a beginner. Please offer some input, advice, and/or some code to help me get past this problem.
Thanks so much,
Jason

ok, here is what I have so far
public class Rational {
     public long num, den;
     public Rational(long n,long d) {
          this.num = n;
          this.den = d;
     public static void main(String args[]) {
          Rational r = new Rational(1,2);
          Rational s = new Rational(3,4);
          Rational rmuls = r.multiply(s);
          Rational rdivs = r.divide(s);
          Rational radds = r.add(s);
          Rational rsubs = r.subtract(s);
          r.print();
          s.print();
          rmuls.print();
          rdivs.print();
          radds.print();
          rsubs.print();
     public void print(){
          System.out.println(this.num+ "/" +this.den);
     public Rational multiply(Rational t){
          long n;
          long d;
          n = this.num*t.num;
          d = this.den*t.den;
          Rational answer = new Rational(n,d);
          return answer;
     public Rational divide(Rational t){
          long n;
          long d;
          n = this.num*t.den;
          d = this.den*t.num;
          Rational answer = new Rational(n,d);
          return answer;
     public Rational add(Rational t){
          long n;
          long d;
          n = (t.den*this.num)+(t.num*this.den);
          d = t.den*this.den;
          Rational answer = new Rational(n,d);
          return answer;
     public Rational subtract(Rational t){
          long n;
          long d;
          n = (t.den*this.num)-(t.num*this.den);
          d = t.den*this.den;          
          Rational answer = new Rational(n,d);
          return answer;
     //public int compareTo (Rational t)??????

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