CS506 Midterm MCQs by Waqas Qureshi

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Correct Midterm MCQs Verified by Myself and Handouts As well. Must Prepare Before Midterm Exams.

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Q1. Which of the following statements is true regarding Vectors with no specified base type?

1. A base type is needed, because Java needs to know how to allocate memory.
2. If a base type is not specified the code will not compile.
3. No base type is needed, because Java will use the Object class as a base type.
4. No base type is needed because Vectors default to storing String objects.

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

Q2. Aside from the Scanner class, which of the following classes can be used for text-file file input?

1. ObjectInputStream
2. BufferedReader
3. StringTokenizer
4. None of these

Correct answer: BufferedReader

Q3. You can ---------to a network using sockets.

1. Read
2. Write
3. Read/Write
4. None of these

Correct answer: Read/Write

Q4. To create DataBaseMetaData object we write following line of code

1. ResultSetMetaData rsmd = rs.getMetaData();
2. DataBaseMetaData db = con.getMeataData();
3. ResultSetMetaData rsmd = rs.setMetaData();
4. DataBaseMetaData db = con.setMeataData();

Correct answer: DataBaseMetaData db = con.getMeataData();

Q5. Which of the following are passed as an argument to the paint ( ) method?

1. A Canvas object
2. An Image object
3. A Graphics object
4. A paint object

Correct answer: A Graphics object

Q6. Please choose one Java developed in----------------------

1. 1990
2. 1995
3. 1997
4. 2000

Correct answer: 1995

Q7. Socket is a --------------communication channel between hosts.

1. Uni-directional
2. Bi-directional
3. Multi-directional
4. None of these

Correct answer: Bi-directional

Q8. Event source can have --------- listeners registered on it.

1. Single
2. Double
3. Multiple
4. Triple

Correct answer: Multiple

Q9. The code below draws a line. What color is the line? g.setColor(Color.red.green.yellow.red); g.drawLine(0, 0, 100,100);

1. Red
2. Green
3. Yellow
4. Black

Correct answer: Black

Q10. Which of the following methods are invoked by the AWT to support paint and repaint operations?

1. paint( )
2. repaint( )
3. draw( )
4. redraw( )

Correct answer: paint( )

Q11. A serializable class must implement the method(s) _________.

1. readObject and writeObject
2. Either readObject or writeObject, or both, depending upon the desired behavior
3. None of the given option
4. No need to implement any method

Correct answer: No need to implement any method

Q12. A member variable or method prefixed by the protected access modifier can be accessed:

1. Within the same class
2. Within the sub-class
3. All of the above
4. Within the same package

Correct answer: All of the above