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1. Create a class diagram (I suggest using creately or draw.io) that describes the following set of objects and their interactions:
- Pen, which can write on a piece of Paper
- Pencil, which can write on a piece of Paper. Pencil can erase written items from paper.
- Marker, which can write on a piece of Paper or a Whiteboard
- Paper which can be written on by a Pen, Pencil or Marker. Paper stores all text written on it, unless erased. Paper can only be written on if it is not full.
- Whiteboard which can be written on by a Marker. Whiteboard can be cleared, which only happens when it's full.
2. Create an implementation based on the class diagram below. Methods do not need to be complete, only skeletons.
3. Write a test harness (PhoneNumberTestHarness.java) and black box cases for the following method description:
/** * isValidPhoneNumber accepts a String value representing a phone number as input. * The input string must follow the following rules: * 1. Be composed of an Area Code (Optional), Prefix (Required) and Suffix (required) * 2. The Area Code must be 3 digits and be in the range [200, 999] * 3. The Prefix must be 3 digits and be in the range (200, 999] * 4. The Suffix must be 4 digits. * 5. The Area code may optionally be surrounded by parenthesis * 6. The Area Code, Prefix and Suffix must be spaced apart by either a single space or a dash (-) * 7. If the Area Code is surrounded by parenthesis, it must be followed by a space. NOT a dash. * @param String phoneNumber The phone number string to be tested * @return boolean Return value is true if and only if the input String passes all 7 rules. * In all other cases, the value returned should be false. */4. When you finish, write a method in PhoneNumber.java that passes all of your tests simultaneously.
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