NOTE - THIS IS NOT A PRACTICE EXAM. IT IS AN OLD EXAM.

(1) (15 pts) Put an X if the class is a Component, put an O if it is a 
Container, and L if it is a layout manager (some may have both and 
some may have none)

_____ Applet
_____ Button
_____ MenuItem
_____ Checkbox
_____ CheckboxGroup
_____ FlowLayout
_____ Menu
_____ GridLayout
_____ Choice
_____ Frame
_____ Label
_____ TextArea
_____ Window
_____ Graphics
_____ ScrollBar

import java.awt.*;
public class WaveText extends java.applet.Applet implements Runnable {
  String str = null;  int direction = 1; // 1 is clockwise, -1 is counterclockwise
  int horizontalRadius = 10;	int verticalRadius = 10;
  Thread runner = null;	char theChars[];		int phase = 0;
  Image offScreenImage;	Graphics offScreenG;

public void init() {
  String paramStr = null;
  str = getParameter("text");
  if (str == null) { str = "Museum of Java Applets"; }
  setBackground(Color.black);
  setFont(new Font("TimesRoman",Font.BOLD,36));
  resize(30+25*str.length()+2*horizontalRadius,80+2*verticalRadius);
  theChars =  new char [str.length()];
  str.getChars(0,str.length(),theChars,0);
  offScreenImage = createImage(this.size().width,this.size().height);
  offScreenG = offScreenImage.getGraphics();
  offScreenG.setFont(new Font("TimesRoman",Font.BOLD,36));
 }

public void start() { 
  if(runner == null) {  runner = new Thread(this); runner.start(); }   } // start

public void stop() {
  if (runner != null) {  runner.stop();  runner = null;  }  }   // stop

public void run() {
  while (runner != null) {
        try {  Thread.sleep(120);  } catch (InterruptedException e) { }
        repaint();
  } // while      }  // run

  public void update(Graphics g) {
    int x, y;		double angle;
    offScreenG.setColor(Color.black);
    offScreenG.fillRect(0,0,this.size().width,this.size().height);
    phase+=direction;	phase%=8;
    for(int i=0;i<str.length();i++) {
          angle = ((phase-i*direction)%8)/4.0*Math.PI;
          x = 20+25*i+(int) (Math.cos(angle)*horizontalRadius); // Horiz. motion
          y = 60+  (int) (Math.sin(angle)*verticalRadius); // Vertical motion
      if (i==0 || theChars[i-1]==' ')  // Each word starts in blue
        offScreenG.setColor(Color.blue);
      else
        offScreenG.setColor(Color.red);  // Each word continues in red
      offScreenG.drawChars(theChars,i,1,x,y);
        }
    paint(g);  } // update

  public void paint(Graphics g) {  g.drawImage(offScreenImage,0,0,this);  }
}

(2)  Answer these questions with reference to the program above.
	(A)(5 pts) List 10 class names:

	(B)(5 pts) How many of each does the class WaveText have:
	_____ instance variables	_____ references to class variables
	_____ methods			_____ calls to class methods
	_____ class methods and variables

	(C)(5 pts) Explain BRIEFLY what each method does in this applet.

	(D)(10 pts) List in English all the "jobs" the init() method does. DON'T JUST ECHO THE CODE!!!!

	(E)(5 pts) write an applet tag to include this applet in your homepage. Include a message for users who do not have Java capable browsers.

	(F)(10 pts) List 10 style errors.

(3) (5 pts) Tell what each of these parts of an Applet tag does:

code
codebase
param
align
height

(4) (20 pts) True and False (write 0 for false and any other value for true)
____  The Java language supports full multiple inheritance.
____  Java is a language derived from C++.
____  All classes in Java inherit directly or indirectly from the Object class.
____  All layout managers are containers.
____  A constructor is a method with the same name as the class, and its 
		return type is always void.
____  You can't overload in Java.
____ The origin of the graphics coordinate system is the upper left corner.
____ A class inherits variables and methods from its superclass.
____ The comparison operators return a boolean value.
____ Programmers can make up their own classes.
____ The first element in a Java array is accessed with [1].
____ Class variables and methods can only be accessed with class names.
____ Security is a critical issue with Java applets.
____ An applet's stop method will be called if a user scrolls it out of sight.
____ An applet's stop method will be called if a user goes to a new page.
____ An applet's stop method will be called if you iconify the browser.
____ A variable defined with the keyword final is a constant.
____ A class can inherit any number of interfaces.
____ Methods that differ only in the return type are called clones.
____ You invoke a method by sending an object a message.

(5) (5 pts) What is printed? 
public class Fun {
   public static void main(String args[]) {
      int count;

      for (count = 10; count < 30; count += 5) { 
         System.out.println(count);
         count++;
      } // for

      System.out.println("count is now " + count );
    } // main
} // Fun


(6) (5 pts) What is printed? 
class Fun2
{  private static int x = 4;

   static char func(int x)
   {  if (x %2 == 1) System.out.println("My, isn't that odd!");

      switch(x)
      {  case 1: System.out.println("I am the first.");
			break;
         case 2: System.out.println("I am the smallest prime number.");
         case 4: System.out.println("I am what I am.");
			break;
         default: System.out.println("oops!");
      } // switch
      return (char)('s' + x %7);
  } // func

   public static void main(String args[])
   {  int y = 3;
      String output = "I got ";
      System.out.println(output + func(y) + func (x) + func(x/y));
   } // main
} // Fun2
(7) (5 pts) List the 3 kinds of variables in Java and give an example of each.

(8) (5 pts) List 5 differences between Java applications and Java applets.