MIDTERM EXAMINATION CS506- Web Design and Development Fall 2008

    

Question No: 1    ( Marks: 1 )    - Please choose one

 Which of the following methods are invoked by the AWT to support paint and repaint operations?

       ► paint( )

       ► repaint( )

       ► draw( )

       ► redraw( )

   

Question No: 2    ( Marks: 1 )    - Please choose one

 When defining a method you must include a ___________ to declare any exception that might be thrown but is not caught in the method. 

       ► try block

       ► finally block

       ► catch block

       ► throws-clause

   

Question No: 3    ( Marks: 1 )    - Please choose one

  Aside from the Scanner class, which of the following classes can be used for text-file file input? 

       ► ObjectInputStream

       ► BufferedReader

       ► StringTokenizer

       ► None of these

   

Question No: 4    ( Marks: 1 )    - Please choose one

 Which of the following statements is true regarding Vectors with no specified base type?

       ► A base type is needed, because Java needs to know how to allocate memory.

       ► No base type is needed, because Java will use the Object class as a base type.

       ► If a base type is not specified the code will not compile.

       ► No base type is needed because Vectors default to storing String objects.

   

Question No: 5    ( Marks: 1 )    - Please choose one

 A serializable class must implement the method(s) _________.

       ► readObject and writeObject

       ► Either readObject or writeObject, or both, depending upon the desired behavior

       ► No need to implement any method

       ► None of the given option

   

Question No: 6    ( Marks: 1 )    - Please choose one

 You can ---------to a network using sockets.

       ► Read

       ► Write

       ► Read/Write

       ► None of these

   

Question No: 7    ( Marks: 1 )    - Please choose one

 Socket is a --------------communication channel between hosts.

       ► Uni-directional

       ► Bi-directional

       ► Multi-directional

       ► None of these

   

Question No: 8    ( Marks: 1 )    - Please choose one

 Which of the following are passed as an argument to the paint ( ) method?

       ► A Canvas object

       ► A Graphics object

       ► An Image object

       ► A paint object

   

Question No: 9    ( Marks: 1 )    - Please choose one

 The code below draws a line. What color is the line?

g.setColor(Color.red.green.yellow.red);
g.drawLine(0, 0, 100,100);

       ► Red

       ► Green

       ► Yellow

       ► Black

   

Question No: 10    ( Marks: 1 )    - Please choose one

 To create DataBaseMetaData object we write following line of code 

       ► DataBaseMetaData db = con.getMeataData();

       ► ResultSetMetaData rsmd = rs.getMetaData();

       ► ResultSetMetaData rsmd = rs.setMetaData();

       ► DataBaseMetaData db = con.setMeataData();

   

Question No: 11    ( Marks: 1 )    - Please choose one

 Event source can have --------- listeners registered on it.

       ► Single

       ► Double

       ► Triple

       ► Multiple

   

Question No: 12    ( Marks: 1 )    - Please choose one

 An abstract class --------------- instantiated.

       ► Can’t be

       ► Can be

       ► Must

       ► None of these

   

Question No: 13    ( Marks: 1 )    - Please choose one

 A ___________ defines the way and method of communication between two parties.

       ► Compiler

       ► Protocol

       ► Tool

       ► Technique

   

Question No: 14    ( Marks: 1 )    - Please choose one

 What if the static modifier is removed from the signature of the main method?

       ► The program does not compile

       ► The program compiles but does not run

       ► The program compiles and runs properly

       ► The program throws an exception on compile time

   

Question No: 15    ( Marks: 1 )    - Please choose one

 What if the main method is declared as private?

       ► The program does not compile

       ► The program compiles but does not run

       ► The program compiles and runs properly

       ► The program throws an exception on compile time

   

Question No: 16    ( Marks: 1 )    - Please choose one

 A member variable or method prefixed by the protected access modifier can be accessed:

       ► Within the  same class

       ► Within the  sub-class

       ► Within the  same package

       ► All of the above

   

Question No: 17    ( Marks: 1 )

 What is the typical use of Hashtable?

   

Question No: 18    ( Marks: 1 )

 Why we use paintChildern( ) method?

   

Question No: 19    ( Marks: 2 )

 Write any two steps of painting strategy.

   

Question No: 20    ( Marks: 3 )

 Name three paint () methods which are used to paint Swing Component.

   

Question No: 21    ( Marks: 5 )

 Differentiate between Named and Anonymous Objects.

   

Question No: 22    ( Marks: 10 )

 Following are the contents of file1.txt

My name is ali.

My roll no is -----

I am studying java.

Java is very easy.

You are required to write a code which will read this file and create a new file in which lines would be swapped in such a way that first line would be swapped with 2^nd and 3^rd with 4^th and so on.

New file should look like:

My roll no is ---------.

My name is ali.

Java is very easy.

I am studying java.

(5 Marks file handling, 5 Marks swapping)