Use Case 3--View High Scores

Context of Use:
The devices displays the top 5 highest scores from previous games. This condition arises by choosing "View High Scores" from the main menu. It also occurs automatically after a game ends.
　

Scope:
J2ME Pac-man Game Application
　

Level:
User Goal
　

Primary Actor:
Mobile Phone or PDA User
　

Stakeholders and Interests:
The User who wishes to view high score from pervious games.
　

Precondition:
The J2ME program is already running.
　

Minimal Guarantees:
High Scores data file will be preserved.
　

Success Guarantees:
High Scores data file exists, and top 5 highest scores are displayed.
　

Trigger:
User chooses "View High Scores" from the main menu.
Triggered automatically after a game ends.
　

Main Success Scenario:
　

• 1. Read "High Scores" from Preferences.
  　
• 2. Display 5 of the highest scores on the screen, along with initials.
  　
• 3. Wait for 5 seconds.
  　
• 4. Proceed to main menu.
  　

Extensions:
　

• 1a. Data file does not exist.
  　
  • 1a1. Preferences creates data file with all 5 scores of zero and initials "__".
    　
• 3a. User presses any key.
  　
  • 3a1. Proceed to main menu.
    　

Technology and Data Variations:
None
　

Related Information:
PacMan Use Case 3 Sequence Diagram
PacMan Use Case 3 and 4 Class Diagram
PacMan Package Diagram
Pac Man Use Case Model