GAMES TWO: LESSON Eighteen: Truck Dodge: Reworking the Code

Truck dodge reuses the cell class used in the next to last CANTRIS lesson and it uses a modified GRID class with an applet class which is pretty much the same as that used in the last two CANTRIS lessons.

The following classes are used in this version of Truck Dodge:

  1. RETRUCK (applet class)
  2. GRID5 (grid class)
  3. TRUCK_CLASS (truck class)
  4. CELL3 (cell class)

The major change in this version of Truck Dodge is that a Vector is used to keep track of the trucks. Here is the declaration of the Vector from the GRID5 class:

Vector truck_vector= new Vector();
The following methods from the vector class are used in GRID5:
get(int index) - returns the object stored at the index lastElement() - returns the last object stored in vector size() - returns the number of elements stored in vector remove(int index) - removes object stored at specified index trimToSize() - trims size of vector to number of objects stored in it addElement() - adds element to end of vector
The get(int) and lastElement() method of the Vector class return objects and so it is necessary to caste these objects so they will be recognized as the proper type of object. Here's a line where casting is performed:
TRUCK_CLASS holder = (TRUCK_CLASS) truck_vector.get(i);

ASSIGNMENT:

In addition to the changes you made in the last assignment, make the following changes to this version of Truck Dodge (using the Vector class):

  1. allow six trucks to be on screen at once
  2. ensure that no two consecutive cars are in the same lane
  3. create a class to handle movement of the car