CS290 Java Programming
Quiz Answers


1. Java does automatic garbage collection      T
    Java Supports pointers                     F
    Java supports multiple inheritance         F
    Java supports mutiple threads              T
    Java code is case sensitive                T
    All Java methods must have a return type   F

2. Instance variable
         Valid within all methods in the class
              int count= 0;

     Class variable
          Valid within all methods in the class and any instances of 
          the class
                static int totalcount =0

      Local variable   
           Valid within the method only
                  int c;

      this variable
            Valid for this class
                 this.count=45;

      super variable
              Valid for the super class
                  super.count=3;




3.  Write a Java program that creates a button and a list object. When the user clicks the button your program should add the word click1 to the list. The second click should add click2 to the list and so on
  
      public class MyApplet extends Applet implements                                                                    ActionListener 
     {
         List list;
         Button button;
         int counter=0;
         public void init()
         {  list= new List(10,false);
             button = new Button("Add");
             button.addActionListener(this);
          }
         public void actionPerformed(ActionEvent e)
          {  Button b= (Button)e.getSource();
              if (b.equals(button))
               { counter++;
                  list.add("click" + String.valueOf(counter));
               }
        }         
             
  4.  a. Font f= new Font(Font.Arial,Font.ITALIC,15) ;
      b. setBackground(Color.Magenta) ;
      c. t.sleep(3000);
      d. g,drawImage(picture.gif,40,50,this);
      e. Frame f= new Frame("My Cool Window");
      f. URL myURL = new URL(www.mysite.com);
      g. final static int myconst=123;





5.   Thread t1= new Thread(this);
     t1.setPriority(Thread.MAX_PRIORITY);
     t1.start();

     Thread t2= new Thread(this);
     t2.setPriority(Thread.MIN_PRIORITY);
     t2.start();