1. An arrangement of data in one or more dimensions.
2. In programming languages, an aggregate that consists of data objects, with identical attributes, each of which may be uniquely referenced by indexing.

    String[]  days = { "Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
    String[][]  ticTacToe = new String[3][3];

                           +-->   Stevens           
        +-->   Moore
         |                 +-->  Lewis
         |                                +--> King
         |
   Kelly
         |                                + --> Irving
         |                 +-->  HAL
         |                  |             +-->  Dave
         +-->  Babbage
                           +-->  Adams      

   or to clean up all the useless files:
      DEL  *.tmp  /s

   The commands COPY and DELETE are part of the command language.
   This is NOT a general-purpose programming language - it does not provide variables,      procedures, or input/output functions. 

      It's not (Sat or Sun) = not Sat AND not Sun
      I'm not big and handsome = either I'm not big or I'm not handsome

    class STUDENT extends PERSON
    {    String GRADE ;
         String  PARENTS ;
    }

    class TEACHER extends PERSON
    {     String CLASSROOM;
           double  SALARY  ;
    }

    TEACHER and STUDENT have both inherited NAME and PHONE from PERSON,
      but have added on fields needed only by a student or a teacher. 

1. In computer security, a sequence of symbols used with a cryptographic algorithm for encrypting or decrypting data.
   Public Key cryptography uses separate keys for encryption and decryption,
   so only one person can send, but anyone can receive
    
2. In databases, the key of a record is a field with a unique value that can be used to locate that record.
   an ID number, like a social security or passport number 

  This returns true on Saturday during the winter - it needs parentheses:  

     if ( (Today .equals("Sat") || Today.equals("Sun") )  && (Season.equals("Summer") ) )

  This is NOT a syntax error, as the program can execute.  
  But it gives the WRONG RESULT. 

    NOT a PC 

    NOT DOS - there is no memory manager - each program occupies the entire memory -
    this is a single-tasking system 

1. The behaviour or operation of an object.
2. The procedure used by an object as specified within the object class. See also the definition for “method signature”.

    Normal methods are CALLED by the main program
    The actionPerformed method in an AWT app is called automatically by Windows
      when a GUI event occurs
    A Constructor is a special kind of method that only runs when the object is instatiated

    Old languages like C were NOT modular - any program was just
    one long list of instructions. 

1. In the terminology of tree structures, each position in the tree is called a “node”.
      Tree, Linked-List
2. Any device on a computer network that can be addressed so that it can be contacted by other computers.
      Client, Server, Router
3. A “host” computer on a network.
      Work station

    9.99 e 999  is an overflow for a double 

    Should be less detailed than a computer program, but should show loops
     and method calls

        if  (COUNT != 0)
        {    AVERAGE = TOTAL / COUNT;  }

   Without the if..then.. error handler, the program is less robust and might crash
   due to a division-by-zero error.

1. risk to hardware
     fire, power surge, theft
2. risk to software
     corruption, deletion, incorrect changes (bad programming), viruses
3. risk to information.
     data-entry errors, deletion, privacy violations

NOT a binary search  

1. A program that provides services requested by client programs.
       Printer server or file server in a LAN 
2. A computer that provides services to another computer connected over a network.
       Web-server

1. The process of approximating a number by ignoring all information beyond a set number of significant figures. Truncation error is the error introduced by this process.
       In Java,  Math.floor(3.7) -->  3.0
       Internally,  3.1415926892827376  -->  3.14159  automatically truncated 
2. The deletion or omission of a leading or a trailing portion of a string in accordance with specified criteria.
       In Java,   String.trim()  removes leading and trailing spaces.

    By looking at the last column, we see that

         (A xor B) or (A and B)  ==  A or B     (equivalent) 

    The "two's complement" of a number is formed by switching all the 0's to 1's
    and all the 1's to 0's, and then adding 1 .   This creates the negative of the
    original number.  The entire system is called "Two's Complement Notation"