Assignment 2 Due 1012

1
Assignment 2Due 10/12

• 2.a. Modify class RelatedTasks, by adding
• a public boolean method ordered,
• which takes an OrderedTasks, which is an ordering
  of its own tasks,
• calls startCheck on each of its own tasks,
• then goes through each of the tasks in the
  OrderedTasks checking whether it canBeNext, and
  if so notifying its successors,
• if the OrderedTasks is consistent with the
  precedences, it returns true, else false

2

• Demonstrate by
• creating a RelatedTasks rt1,
• creating and adding to rt1 a Task t5 with a
  taskNum of 5, a TimedTask tt6 with a taskNum of 6
  and a time of 16, a Task t7 with a taskNum of 7,
  a Task t8 with a taskNum of 8, a Task t9 with a
  taskNum of 9,
• adding to rt1 the precedences t8 lt t7 and t9 lt
  tt6,
• creating OrderedTasks with t8,t5,t9,tt6,t7 and
  with t5,t8,t7,tt6,t9, and for each test and print
  out whether they are ordered

3

• 2.b. Modify class RelatedTasks, by adding a
  public method order, which returns an
  OrderedTasks,
• it creates a clone tempTasks of its tasks
• then successively
• finds a task that canBeNext,
• removes it from tempTasks,
• puts it in the OrderedTasks to be returned,
• and notifies its successors
• until tempTasks isEmpty
• Demonstrate by calling order on rt1 from 4.a. and
  printing the returned OrderedTasks
• NOTE Vector offers removeElement(Object),
  isEmpty()

4

• 2.c. Create a Window-Based Event-Driven
  Application
• The GUI should have
• a TextField for instructions
• a TextField for entering task numbers
• a Button for done entering tasks
• a Choice list for choosing a predecessor
• a Choice list for choosing a successor
• a Button for entering a precedence
• a Button for done entering precedences
• a TextArea for displaying an ordering

5

• The application should use Task, OrderedTasks,
  OrderedTasksEnum, and RelatedTasks
• The user first enters some task numbers.
• The application creates the tasks.
• These task numbers are used to populate the two
  choice lists.
• The user chooses a predecessor and a successor
  for each precedence and enters the precedence.

6

• When the user is done entering precedences, the
  application then outputs one ordering of the
  tasks that is consistent with the precedences.
• Instructions should guide the user through this
  process.
• Demonstrate the program by entering the tasks
  5,4,3,2,1 in that order,
• entering the precedences 3lt5,1lt4,2lt3 in that
  order, and capture the
• frame when the ordering is displayed.
• HINT Keep a Vector of handles to Tasks in the
  app, so it can call addPrecedence, based on on
  the indices of the choices