• Mutiple choice questions - 50% of the test
• Writing class methods - 20%
• Tracing Code - 20%
• Finding syntax errors - 10%

• Describe the problem solving process? Why do we design before coding?
• Compare OOP vs Procedural?
• Describe the problem solving process and OO design.
• Identify classes and objects in a ATM system.
• Describe a set of methods for each of the class defined above.
• Explain the standard Java class template:

Public <return-type> <method-name> ( <parameter-list>) {
}
}

• Define the terms, package, class, methods, private, public, protected, object
• What are the three types of class relationships?
• Describe the Java primitive data types, and java reference types.
• Why do we throw an exception?
• What is the purpose of new operator?
• Give examples of the use of Java, if statment, for loops, while loop, switch statment
• How do we declare arrays in Java? How do we read data into an array? How  do we access them?
• Write a Java code segment that will interactively read a set of integers into an array, and find its their sum and average.
• Write code to sort an array of integers. Write code to reverse an array.
• How do we declare matrices? How do we use them?
• Write a code segment to return true if  A[i][j] = A[j][i] for all i and j
• What are some of the methods from vector class? How do we use them? You dont have to memorize these? But know how to use them? Why do we use a vector as opposed to an array?
• Explain the standard method template

• How does Java assign memory for class methods, and objects?
• What is a default constructor? Specific constructor? Give an example of each for Elevator class.
• What are accessors? Mutators? Give an example of each.
• What are subclasses and superclasses. Give an example in terms of Account class and SavingAccount class.
• What is "this"?
• Write a method compareTo, that takes an elevator object and return true if it is equal to the instance object, else retrun false.
• More will be added later.

WRITING NEW CLASS METHODS
1. Add a new method to the RandomMatrix class in lab2 to do the following
    a.  if the matrix is 2 by 2 then find the inverse of the matrix using
        inverse [ a   b]    is   1/(ad - bc) * [ d   -b]
                   [ c   d]                              [ -c   a]

    b. return true if the matrix is symmetric. i.e.   A[i][j] = A[j][i] for all i,j
    c. a method  isSquare  that returns true if the matrix is sqaure ie. rows = columns

2. Consider the elevator class defined in class. Write a method,
    pickPassenger  that will take a passenger object P as an object and
   add to the internal vector of passengers "in-order" of the destination.

TRACING/WRITING CODE
1. Assume the world of Karel the Robot.
What is the intent of the following code? Describe in words. Can you simplify it?
while (frontIsClear()) {
 if (frontIsClear()) {
  move();
 } else {
  turnAround();
 }
}

2.
    while (i < 5) {
       if (i < 2)  { turnLeft(); i = i + 1;}
       else
          { turnLeft(); turnLeft(); turnLeft(); i = i + 2;}
   }

 Assume that the Robot is facing east. Find the final direction if:
i = 1
i = 5
i = 3
 

3. Study the class defintion of matrix
public class Matrix
{
 public Matrix() {}       // unallocated vectors
 public Matrix(int n, int m); // dimensions given
public Matrix(int n, int m, final int fillValue);
        // and default fill value
     private int NumRows ;
     private int NumColumns ;
   public int final getRows();
  public int final getColumns();
     public void SetDimensions(int r, int c);
  };

a. How many methods are accessors? How many are mutators? How many are constructors?
b. Show Three different ways of creating a matrix.
c. Using the available methods only, write new methods to find the
       a. A boolean method that returns true if the matrix is symmetric (i.e M[i][j]=M[j][i])
       b. A boolean method to return true if the matrix is square.

================================
4. What relationship is satisfied for class composition? Class inheritance?
5. If passenger class object is contained in a elevator class, does elevator class
    has access to all the methods (private and public) of the passenger class?
6. "A Meal has a vegetable", which class contains an object from the other class?
7. Explain the code:  OnePerson(int I, string n){id=i; name=n;}

FIND SYNTAX/LOGIC ERRORS
1. Find ALL syntax errors of the following code:
    if  facingnorth() )
     {  turnLeft() }
    else;
      {  Move() ; }

2. Find all syntax errors
     while  (frontIsClear)
        { move();}

3. find redundant code
   if  (i < 1)
     { move(); }
   else
      if  (i >=1)
        { turnLeft();}
      else
         { pickBeeper();}