CS506 Midterm Online Quiz

CS506-Midterm

1 / 50

All the exceptions and errors in java are inherited from _____ class.

Error

Throwable

Exception

2 / 50

In Java an abstract class cannot be sub-classed

TRUE

FALSE

3 / 50

Which of the following statement object is used to execute stored procedures?

PreparedStatement

Statement

CallableStatement

4 / 50

In Java a final class must be sub-classed before it.

TRUE

FALSE

5 / 50

Aside from the Scanner class, which of the following class/es can be used for text file file input

StringTokenizer

ObjectInputStream

BufferedReader

6 / 50

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

Single

Multiple

Triple

Double

7 / 50

Which of the following stream is a filter stream?

FileWriter

FileReader

BufferedReader

All of given options

8 / 50

Which of the following is true about abstract class?

An abstract class must have all methods declared as abstract methods.

A class must have at least one abstract method to be an abstract class.

A class without any abstract method can be declared as abstract class.

9 / 50

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

Compiler

Tool

Protocol

10 / 50

Which of the following function will be used to register event handler with events generator (button)?

addActionListener()

addAction()

addListener()

11 / 50

Which of following can be thrown using the throw statement?

RuntimeException

Exception

Throwable

Error

12 / 50

What if the main method is declared as private?

The program compiles and runs properly

The program does not compile

The program compiles but does not run rep

13 / 50

Which of the following syntax is used to attach an input stream to console?

FileReader fr = new FileReader(FileDescriptor.in);

FileReader fr = new FileReader(' input.txt ') ;

FileReader fr = new FileReader(FileDescriptor);

14 / 50

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

A Canvas object-

A Graphics object-

An Image object-

15 / 50

Window frame and dialog use ________ as their default layout.

Flow layout

GridBag layout

Border layout

16 / 50

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

None of these

Can be

Must

Can’t be

17 / 50

Exceptions must be handled while handling files otherwise it may lead to _____

Logical error

Run-time error

Syntax error

18 / 50

HahMap takes key as a/an _________

Array

Object

Primitive value

19 / 50

Which of these are valid declarations for the main method?

public static void main(String args[]);

static public void main(String);

public void main();

public static int main(String args[]);

20 / 50

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.

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

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

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

21 / 50

Given a one dimensional array arr, what is the correct way of getting the number of elements in arr

arr.length

arr.size – 1

arr.length()

arr.length – 1

22 / 50

Border layout divides the area into _______ regions

23 / 50

Which of the following is called ' pure abstract class ' ?

Wrapper class

Concrete class

Interface

24 / 50

A final class can't be extended.

FALSE

TRUE

25 / 50

Which of the following is true about abstract class?

An instance of abstract class can be created.

An abstract class must have all methods declared as abstract methods.

A class must have at least one abstract method to be an abstract class.

A class without any abstract method can be declared as abstract class. rep

26 / 50

Which of the following is true about AWT and SWING components?

AWT components create a thread whereas SWING component creates a process.

AWT components create a process whereas SWING component creates a thread.

Both AWT and SWING component creates a process.

27 / 50

If we remove static from main then program __________

Program cannot compile

Exception throws in main

Program will compile and work properly

Run time errors

28 / 50

If a super class method is protected then overriding method _________

must be protected

must be public

must be private

29 / 50

The collections API are defined in ______ package?

Java.util

Java.io

Java.sql

Java.awt

30 / 50

In Java garbage collection is done by_______________

JVM (Java Virtual Machine)

OS (Operating System)

Both JVM (Java Virtual Machine)and Programmer

Programmer

31 / 50

CREATE, ALTER, DROP are _________ SQL statements.

DML

DCL

DDL

32 / 50

Which of the following function will be used to register event handler with events generator (button)?

addAction()

addListener()

addActionListener()

33 / 50

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

An Image object

A Graphics object

A Canvas object

A paint object

34 / 50

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

Multi-directional

Bi-directional

Uni-directional

35 / 50

Which of the following is called ' pure abstract class ' ?

Concrete class

Interface

Wrapper class

36 / 50

Exceptions must be handled while handling files otherwise it may lead to _____

Logical error

Run-time error

Syntax error

37 / 50

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

throws-clause

catch block

38 / 50

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

paint( )

repaint( )

redraw( )

draw( )

39 / 50

In Java an abstract class cannot be sub-classed

TRUE

FALSE

40 / 50

Java developed in __________

1997

1990

1995

41 / 50

Overloading is _______ whereas overriding is _____

Run time binding, compile time binding

Compile time binding, run time binding

Late binding, compile time binding

42 / 50

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

Can be

Can’t be

Must

None of these

43 / 50

A top level class may have only the following access modifier.

Protected

Public

Package

Private

44 / 50

Based on functionality, the streams can be categorized as________

Byte oriented streams and Node Streams

Filter stream and Character oriented stream

Node stream and Filter stream

Byte oriented stream and Character oriented stream

45 / 50

A top level class without any modifier is accessible to

any class within the same file

any class within the same package

any subclass of this class

any class

46 / 50

To create DataBaseMetaData object we write following line of code

ResultSetMetaData rsmd = rs.getMetaData();

DataBaseMetaData db = con.getMeataData();

ResultSetMetaData rsmd = rs.setMetaData();

47 / 50

____________is/are the JSP Implicit Object(s).

application

session

All of Given

config

48 / 50

DSN stands for _________

Data System Name

Data Source Name

Domain system Name

49 / 50

Which of the following exception belongs to a category of un-checked exception?

IOException

AWTException

Null Pointer exception

50 / 50

CREATE, ALTER, DROP are _________ SQL statements.

DML

None of above

DCL

DDL

Your score is

The average score is 32%