CS506 MIDTERM SOLVED MCQS with references by MOAAZ
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If we remove static from main then program __________.
Program cannot compile
Program will compile and work properly
Run time errors
Exception throws in main
4
Program cannot compile
Program will compile and work properly
Run time errors
Exception throws in main
4
If we remove String array from main then program__________.
Program cannot compile
Program will compile and work properly
Run time errors
Exception throws in main
3
Java developed in _________.
1990
1995
1997
2000
2
Which of the following methods are invoked by the AWT to support paint and repaint operations?
paint( )
repaint( )
draw( )
redraw( )
1
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
4
Aside from the Scanner class, which of the following classes can be used for text-file file input?
ObjectInputStream
BufferedReader
StringTokenizer
None of these
2
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.
2
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
3
You can ---------to a network using sockets.
Read
Write
Read/Write
None of these
3
Socket is a --------------communication channel between hosts.
Uni-directional
Bi-directional
Multi-directional
None of these
2
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
2
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
4
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();
1
Event source can have --------- listeners registered on it.
Single
Double
Triple
Multiple
4
An abstract class --------------- instantiated.
Can’t be
Can be
Must
None of these
1
A ___________ defines the way and method of communication between two parties.
Compiler
Protocol
Tool
Technique
2
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
4
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
2
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
4
A top-level class without any modifier is accessible to
any class
any class within the same package
any class within the same file
any subclass of this class
2
