Help with error in running program

[Dianne Calhoun]

Here is what I'm doing for this assignment:
Create a class called Rational for performing arithmetic
with factions. Write a driver program to test your class.
Use integer variables to represent the private instance variables
of the class, numerator and denominator. These instance variables
are not changed by any of the methods other than the constructor
method. (Immutable object)
The following methods are part of the class.
/** Constructor that initialized values of rational number */
public Rational(int numerator, int denominator);
/** Add other rational number and this rational number
* and return new Rational number. Do not change this rational
* number.
*/
public Rational add(Rational other);
/** Substract other rational number from this rational number
* and return new Rational number. Do not change this rational
* number.
*/
public Rational subtract(Rational other);
/** Print numerator = ... denominator = ... for this rational
* number.
*/
public void print();
/** Print rational number = xx.xx */
public void printfloat();
------------------------
The test class will be of form:
public class TestRational {
// main
public static void main(String[] args) {
// create and test Rational objects here
}
}
______________________________End of instructions
--------------------------------------------------------------------
Here are my programs

Rational.java
// This a a class that performs arithmetic with fractions
// Represents a mathematical fraction, consisting of a
// numerator and a denominator, both of which are integers.
public class Rational {
  // Instance variables
  private int numerator;    // Numerator of fraction
  private int denominator;  // Denominator of fraction
  // Constructs a fraction with the specified numerator and denominator
  public Rational(int num, int denom)
  {
    numerator = num;
    denominator = denom;
  }

  /** Constructs a fraction with the specified
   *  numerator and a denominator of 1
   */
  public Rational(int num)
  {
    this(num, 1);
  }

  /** Constructs a fraction with a numerator of 0
   *   and a denominator of 1
   */
  public Rational()
  {
    this(0, 1);
  }

  /** Add other rational number and this rational number
   * and return new Rational number.  Do not change this rational
   * number
  */
  public Rational add(Rational f)
  {
    int num = numerator * f.denominator +
              f.numerator * denominator;
    int denom = denominator * f.denominator;
    return new Rational(num, denom);
  }

  // getDenominator returns the denominator of this fraction
  public int getDenominator()
  {
    return denominator;
  }

  // getNumerator returns the numerator of this fraction
  public int getNumerator()
  {
    return numerator;
  }

  /** Subtract other rational number from this rational number
   *  and return new rational number.  Do not change this rational
   *  number.
  */
  public Rational subtract(Rational f)
  {
    int num = numerator * f.denominator -
              f.numerator * denominator;
    int denom = denominator * f.denominator;
    return new Rational(num, denom);
  }

  /**Print numerator = ...  denominator = ... for this rational
   * number.
   */
  public void print()
  {
System.out.println("numerator=" + this.numerator);
System.out.println("denominator=" + this.denominator);
}
  // Print rational number = xx.xx
  // Converts this fraction into a float value
  public void printfloat()
    {
      double f = (double) numerator / denominator;
      System.out.println("rational number =" +f);
    }
 }

End of Rational.java

Beg TestRational.java
// This a program that tests the Rational class.
public class TestRational
{
//main
public static void main(String[] args)
{
Rational r1 = new Rational(4, 5);
System.out.println();
r1.print();
r1.printfloat();
Rational r2 = new Rational(7, 8);
System.out.println();
r2.print();
r2.printfloat();
Rational r3 = r1.add(r2);
System.out.println();
r3.print();
r3.printfloat();
Rational r4 = r1.subtract(r2);
System.out.println();
r4.print();
r4.printfloat();
}
}

End Test Rational.java
They both compile, but when I run the TestRational.java it gives me the following error, and I'm wondering if anyone can help explain what it is. This is only my fourth java program I've written, so I'm really new to Java, and to programming. Any help will be appreciated.
C:\myjava\assignment2\problem1>java TestRational.java
Exception in thread "main" java.lang.NoClassDefFoundError: TestRational/java
------------------

[This message has been edited by Dianne Calhoun (edited September 30, 2001).]

[Marilyn de Queiroz]

They both compile, but when I run the TestRational.java, it gives
me the following error, ....

C:\myjava\assignment2\problem1>java TestRational.java
Exception in thread "main" java.lang.NoClassDefFoundError:
TestRational/java

Rather than

C:\myjava\assignment2\problem1>java TestRational.java

try

C:\myjava\assignment2\problem1>java TestRational

[Dianne Calhoun]

Thanks, I knew that I just had a momentary lapse of memory. Comes from being frustrated working on these programs all weekend. Sometimes it just takes someone else looking.
------------------
Thanks, Dianne