Java Programming

Assignment  A
1. What is OOPs? What is the difference between Procedural and OOPs?

 
2. A) Explain Inheritance, Polymorphism and Encapsulation?

B) What do you mean by Final, finalize () and finally. Explain with examples?

3. A) What are Checked and Unchecked Exception?

B) What is the difference between declaring a variable and defining a variable?

4. A) What is method overloading and overriding and State the difference between method overloading and overriding?

B) What restriction are placed on method overriding.

5. A) Does garbage collection guarantees that a program will not run out of memory?

B) Why do we need wrapper classes?

6. A) How can you achieve Multiple Inheritance in Java?

b) What is the difference between StringBuffer and String class?

7. A)   What is a Java Package and how it is used?

B)  Can applets communicate with each other? Explain?

8. What is the basic difference between the 2 approaches to exception handling.
1> try catch block and 
2> specifying the candidate exceptions in the throws clause?
When should you use which approach?

ASSINGNMENT B
1. Write a program using inheritance to create a class Room. The class should have parameters length and breadth. Further using method overloading create another room that takes x and y as arguments. Create a function to Area () to calculate area of room (length*breadth). Derive a class from Room called Room1. It has a 1 parameter height. Using method overloading create another room1 that takes x, y and z as arguments. Create a function Volume to calculate volume of room (length*breadth*height).

Assignment C

Question No.  1 

What would be the results of compiling and running the following class. Select the one correct answer.

class test
{
 public static void main()
{
 System.out.println("test"); 
}
} 

Options 

The program does not compile as there is no main method defined 
The program compiles and runs generating an output of "test" 
The program compiles and runs but does not generate any output 
The program compiles but does not run. 

Question No.  2 

Which of these are valid declarations for the main method? Select the one correct answer. 

Options 

public void main(); 
public static void main(String args[]); 
static public void main(String); 
public static void main(String ); 

Question No. 3  

Which of the following are valid declarations for the main method. Select the three correct answers 

Options 

public static void main(String args[]); 
public static void main(String []args); 
final static public void main (String args[]); 
public static int main(String args[]); 

Question No. 4

What happens when the following program is compiled and executed with the command - java 

test. Select the one correct answer.
class test {
public static void main(String args[])
{ if(args.length > 0)
System.out.println(args.length); 
} }   

Options 
The program compiles and runs but does not print anything. 
The program compiles and runs and prints 0 
The program compiles and runs and prints 1 
The program compiles and runs and prints 2 

Question No.   5

The signed right shift operator in Java is --. Select the one correct answer 

Options 
<<; 
>> 
>>>; 
None of these. 

Question No.  6 

What gets printed on the standard output when the class below is compiled and executed. Select the one correct answer.

public class ShortCkt {
public static void main(String args[])
{ int i = 0; boolean
t = true; 
boolean f = false, b;
b = (t && ((i++) == 0));
b = (f && ((i+=2) > 0));
System.out.println(i); } }   

Options 
0 
1 
2 
3 

Question No. 7  

What gets printed on the standard output when the class below is compiled and executed. Select the one correct answer. 

public class ShortCkt {
public static void main(String args[]) {
int i = 0; boolean
t = true; 
boolean f = false, b; 
b = (t || ((i++) == 0)); 
b = (f || ((i+=2) > 0)); 
System.out.println(i); } } 

Options 
0 
1 
2 
3 

Question No. 8  

What gets printed on the standard output when the class below is compiled and executed. Select the
One correct answer. public class ShortCkt { public static void main(String args[]) { int i = 0; 
boolean t = true; boolean f = false, b; b = (t | ((i++) == 0)); b = (f | ((i+=2) > 0));
System.out.println(i); } } 

Options 
0 
1 
2 
3 

Question No. 9  

Which operator is used to perform bitwise inversion in Java. Select the one correct answer. 

 Options 
~ 
! 
& 
| 

Question No. 10  
A function is: 

Options 
An entity that receives inputs and outputs 
A way of storing values 
A sequence of characters enclosed by quotes 
A kind of computer 

Question No. 11  

The method setLabel can be used with what type of Object?

Options 
DoubleField 
int 
TextField 
String 

Question No. 12  

What is the difference between a TextArea and a TextField? 

Options 
A TextArea can handle multiple lines of text 
A textarea can be used for output 
TextArea is not a class 
TextAreas are used for displaying graphics 

Question No.  13 
How many types of comments are possible in java? 
Options 
Two 
Three 
One 
None of these 

Question No. 14  

Which of the following are valid variable names? 

Options 
Catch 
Nocount 
Msisdn 
Switch 

Question No. 15 

A variable name: 

Options 
Must not be a keyword in java. 
Must not being with a digit. 
Must not contain embedded space. 
Can contain characters from various alphabets, like Japanese, Greek & Cyrillic. 

Question No. 16  

Java program are:-   

Options 
Platform dependent. 
Platform Independent. 
Portable 
Robust 

Question No. 17   

The---------operator is used to create a class object. 

Options 
Create 
Dot 
New 
None of these 

Question No. 18 

Which loop is called entry controlled loop 

Options 
For loop 
While loop 
Do-while loop 
Repeat until loop 

Question No.  19 

Which of the following are comparison operators?  

Options 
= = 
! 
| 
!= 

Question No. 20  

Switch (Expression) {
       Case value 1:
                      // Statement Sequence
                     Break;
       Case value 2:
                   // Statement Sequence
                   Break;
           -
           -
       Default:
 }

The expression must be of type— 

Options 
Short 
Int 
Byte 
Char 

Question No.  21 

How do you declare an array? 

Options 
Int []num; 
Int num[]; 
Int num[]=new int[10]; 
All of the above 

Question No. 22  

A constructor has 

Options 
Same names as that of the class 
Does not have a return type 
Can be called automatically when the object of a class is created 
All of the above 

Question No. 23  

The keyword super is used for calling 

Options 
Derived class constructor 
Base class constructor 
Initializing the variable of a base class 
All of the above 

Question No.  24 

A constructor without any arguments/parameters is known as--------- 

Options 
Copy constructor 
Parameterized constructor 
Default constructor 
None of these 

Question No.  25 

A class declared as final cannot be 

Options 
Inherited 
Overloaded 
Overridden 
All of the above 

Question No.  26 

Java handles exceptions the--------way 

Options 
Procedural oriented 
Natural 
Object oriented 
None of the these 

Question No. 27  

Which two classes are derived from Throwable Class? 

Options 
Error & Exception 
Throw & Throws 
Try & Finally 
None of these 

Question No.  28 

In order to handle user defined exception which keyword is used 

Options 
Throw 
Throws 
Throwable 
Finally 

Question No. 29  

Java applications are run by using a

Options 
Java compiler 
Java interpreter 
Javac 
None of these 

Question No. 30  

Which of the following are primitive data types? 

Options 
Int 
Char 
Byte 
String 

Question No. 31  

Which of the following methods are present in applet life cycle? 

Options 
Main() 
Paint() 
Init() 
Start() 

Question No. 32  

AWT stands for 

Options 
Abstract Window Toolkit 
Abstract Window Toolpane 
Applet Window Toolkit 
Asynchronous Windowing Tool 

Question No.  33 

What are the components of an event? 

Options 
Event handler 
Event object 
Event source 
None of these 

Question No.  34 

If no access specifier is specified before a class name or variable name or function name then which is the defaults specifier----- 

Options 
Public 
Private 
Protected 
Default 

Question No.  35 

What is the size of the integer & character types in java? 

Options 
4 bytes & 2 bytes 
2 bytes & 1 bytes 
2 bytes & 2 bytes 
4 bytes & 1 bytes 

Question No. 36  

If we write final keyword infront of a function name then the function cannot be 
Options 
Overloaded 
Overridden 
Inherited 
Abstract 

Question No.  37 

Two function are said to be overloaded if --- 

Options 
It has the same name 
The return type many or may not be same 
Argument list must differ 
None of these 

Question No. 38  

Which tool creates the C-header file 
Options 
Javac 
Java 
Javah 
Jdb 

Question No. 39  Solve by www.solvezone.in

CLASSPATH is ---- 

Options 
A keyword 
A variable name 
An environmental variable 
None of these 

Question No. 40  
What is the difference between Switch & Statement & if –else

Options 
There is no difference 
Switch statement is used for checking all condition(i.e. equal to ,>&<) where as 
Switch statement only checks for equality condition where as if else is used for checking all type of condition. 
None of these