Review for CSCI 1380.03 (Java)

   Chapter six: The BasicMenu class

         Arrays:

 String theOptions[];
 String infor;
 int    i;

 theOptions = new String[4];
 infor      = new String(30);

 for (i = 0; i < 4; i ++)
 {
    infor = in.readLine();
    theOptions[i] = new String(infor);
 }


      Iterations:

      For loop: 

  for (initial; loop condition; update)
      statement;

  Random g = new Random();

  for (i = 0; i < 100; i ++)
     System.out.println(g.nextInt());


       While loop:

  while (condition)
    statement;

  i = 0;
  while (i < 100)
  {
    System.out.println(g.nextInt());
    i ++;
  }

Typically, the statement inside a while loop always has to have some
action that modifies the condition, otherwise, it would be an infinite loop


        Basic keyboard input:

           Declare a keyboard input stream

  DataInputStream key = new DataInputStream( System.in );

            Use of  try/catch cluase
  
    try {
       str = in.readLine();
    }
    catch ( IOException e) {
      System.out.println("I/O exception");
    }

            Read integers and doubles:

// read an integer
    try {
       str = in.readLine();      // str is a String
       n   = Integer.parseInt(str);   // n is an integer
       valid = true;
    }
    catch (NumberFormatException e)
    {
       System.out.println("Number format invalid, try again");
    }
    catch (IOException e)
    {
       Sytem.out.println("I/O error, exiting");
       System.exit(1);
    }

// read a double
    try {
       str = in.readLine();      // str is a String
       r   = Double.valueOf(str);   // r is a Double
       valid = true;
    }
    catch (NumberFormatException e)
    {
       System.out.println("Number format invalid, try again");
    }
    catch (IOException e)
    {
       Sytem.out.println("I/O error, exiting");
       System.exit(1);
    }


      Chapter seven: The AdaptingMenu class

           The switch statement

   switch ( value ) 
   {
      case  4 : System.out.println("perfect");
                break;
      case  3 : System.out.println("perfect");
                break;
      case  2 : System.out.println("fair");
                break;
      default:
                System.out.println("try again");     
   }  // End switch

            Menu driven program

      Chapter eight: concurrent processes

             concept of threads
             danger of inconsistant data
             synchronized
             thread model: sleep(), suspend(), resume();
             syntax:

  class name extends Thread {
 
    // other methods and members
    void run ()
    {
      // required for a thread
    }
  }