COMPUTER SCIENCE Summer 2006
Unit 1, Lab02 Escape the Maze

Read page One-10. The assignment is at the bottom of the page, the last paragraph.
You need to create two Java files:
- One of these files has the driver, public static void main(String[] args). This file is named Lab02.java and has its class as public class Lab02 { . . . }
- The second file is public class Athlete. This file does NOT have the main driver function. In a normal Java program, only one of your files has the main driver function. If your Java program has more than one file, one of the files has main, and the other file(s) contain other class definitions that will be used by the main driver funtion.
- public class Athlete (name this file Athlete.java - it must match the name of the class in the file) is used to define more commands for a Robot.
See the "shell" of the file Athlete.java on page One-10. This creates the Athlete class.
- class Athlete extends class Robot. This means that an Athlete does everything a Robot can do, except an Athlete can do more. Whatever commands you'd like your Robot to do in addition to a regular Robot, you can put these in the Athlete class.
- There are two constructors in class Athlete. The default constructor for Athlete uses a constructor from Robot to set the Athlete's position at 1,1, facing World.NORTH, and carrying infinite beepers. The Java syntax for this is:
```
      public Athlete()
      {
         super(1, 1, World.NORTH, World.INFINITY);
      }
 
```
- You can recognize something as a constructor because there are no words between public and Athlete. In computer programming terms, there is no type. In Java, some common types are: void, int, double, boolean. Note that none of these types appear before the word Athlete
- You can recognize a constructor as a default constructor if there are no words in the parenthesis. This means there are no parameters to be sent to the object when you are creating it.
- The second constructor in Athlete has paramters in the parenthesis
```
      public Athlete(int x, int y, int dir, int beep)
      {
         super(x, y, dir, beep);
      }
 
```
  With this constructor you can create an Athlete giving it an x,y position (avenue, street), a direction, and the number of beepers.
```
     Athlete nameOfAthlete = new Athlete(2,3,World.NORTH, 5); is an example
  
```
You need to complete the definitions for new commands which an Athlete can do, but a Robot cannot do. These commands are turnAround() and turnRight()
Compile this file Athlete.java, but do NOT run it. This file does not contain the main driver function. Compiling the file creates Athlete.class which will be used by Lab02.java.
The file named Lab02.java begins in a similar fashion as Lab00 and Lab01. A difference is that now you'll use the Athlete class rather than the Robot class. Compile and Run this file. Lab02.java is the file with the main driver function

COMPUTER SCIENCE Summer 2006 Unit 1, Lab02 Escape the Maze

COMPUTER SCIENCE Summer 2006
Unit 1, Lab02 Escape the Maze