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Suppose we want to define a class representing a right triangle given the length of the two sides forming the right angle, which we call base and height . What code should we write? Use the DrJava New command to
create a new document. In this document define a class called RightTriangle with fields of type double called base and height, and a method

doubleareadouble area()

to compute the area of this right triangle. Save and compile this file. Interact with it in the Interactions pane.

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class Person {
  /** 
   * Computes the number of months till the next birthday given the current month. 
   */
  intnMonthTillBD(intcurrentMonth) {
    // todo
  } 
}

Notice in the above there is really no concrete code. As a matter of fact, the above would not compile. Now we must abandon everything and start writing test code for nMonthTillBD(...).

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class Person {
   int_bMonth; 

   /** 
    * Computes the number of months till the next birthday. 
    */
   int nMonthTillBD(intcurrentMonth) {
      return0;// todo
   } 
}

Step 4.

After you have cleaned up your code for Person as shown in the above, you should be able to compile Test_Person. With Test_Person open, click on the Test button in DrJava tool bar.

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