Java Programming

Assignment A

1. What are the most important features of Java? How does Java achieve platform independence?

2. a) What are native methods? How do you use them? 

b)   What are wrapper classes? Why are they used?    

3. Explain the concept of method overriding. Can we over-ride method within the same class? Explain.  

4. What is a static method? Why can’t a static method use ‘this’ and ‘super’? Explain with example.

5. a) State the significance of public, private, protected, default modifiers 

 b) What are different types of inner classes?

6. a) How does exception-handling work in Java? 

    
b) Why Java doesn't support multiple inheritances?    

7. Explain the concept of interface. What is scope and nature of variables and methods defined in an interface?

8. Explain the event delegation models in AWT. What are the components of an event?

Assignment B
Case Detail:

Read the following and create appropriate java applets.
a)  Create a try block that is likely to generate two types of exception and then incorporate necessary catch block to handle them appropriately

b) Create a java applet with a button “Display”. On click of button it should display Rectangle,   Oval and Circle within the Applet.

3.  Create the following form in Java:-
a) .  Subject should display name of subjects: - 
C++
VB  
Java 

b). Foreign language should display choice of foreign languages French, German and Japanese. 

c). Submit button should submit the result.

Assignment C

Question No.  1
Which of the following expressions will produce errors upon compilation?

(A) boolean a = (boolean) 1;
(B) boolean b = (false && true);
(C) float y = 22.3;

Options    
(A) & (C)    
(A)    
(A), (C) & (D)    
(A), (B) & (D)

Question No.  2
Which of the following expressions will produce errors upon compilation?

(A) boolean a = (boolean) 1;
(B) boolean b = (false && true);
(C) float y = 22.3;

Options    
(A) & (C)    
(A)    
(A), (C) & (D)    
(A), (B) & (D)

Question No.  3    
The control expression in an "if" statement must be--         
 
Options    
an expression with type boolean    
an expression with type integer    
an expression with either the type boolean or integer    
an expression with either the type boolean or integer with value 0 or 1    

Question No.  4    
Which of the following represent legal flow control statements?

(A) break;
(B) break();
(C) continue outer;
(D) continue(inner);
(E) return;
(F) exit();

Options    
(A), (C) & (E)    
(A), (B) & (C)    
(A), (C) & (D)    
(A) & (E)

Question No.  5
Which of the following represent legal flow control statements?
Are there any errors in the following class definition?
abstract class Class1
Options    
Class header definition is wrong    
Method definition is wrong    
Constructor needs to be defined    
No errors

Question No.  6
With  javadoc, which of the following denotes a javadoc comment?

Options    
/**    
//#    
/*    
//**

Question No.  7    
Which javadoc tag is used to denote a comment for a method parameter?            

Options    
@param    
@method    
@parameter    
@argument    

Question No.  8    
What will be the result of the expression?
a % b when a and b are of type int and their values are a = 10 and b = 6?
 
Options    
1.66    
1    
None of these    
4

Question No.  9
Determine the output when the value of x is zero-- 
if(x >= 0)
if(x > 0)
System.out.println("x is positive");
else
System.out.println("x is negative");

Options    
"x is negative"    
"x is positive"    
"x is positive" and "x is negative"    
None of these

Question No.  10
Which of the following is correct syntax for an Abstract class?

Options    
abstract double area() { }    
abstract double area()    
abstract double area();    
abstract double area(); { }

Question No.  11
What is the output of following piece of code? 
int x = 2;
switch (x) {
case 1:System.out.println(”1″);
case 2:
case 3:System.out.println(”3″);
case 4:
case 5:System.out.println(”5″);
}

Options    
No output    
3 & 5    
1, 3 & 5    
3    

Question No.  12
__________ converts the java program to byte code.

Options    
Java Virtual Machine    
Compiler    
Java Libraries    
Java Editor

Question No.  13
What would happen if you don’t include String args[] in the main method of any class?       
 
Options    
No error    
Compile error    
Runtime Error    
No error but goes to infinite loop    

Question No.  14
JVM stands for    
 
Options    
Java Vision Mechanism    
Java Virtual Machine    
Java Virtual Model    
Java Vertical Model    

Question No.  15
Java consists of a ready-made package called 
Options    
Java Program    
Java Applet    
Java API    
Java Widgets

Question No.  16
Java Platforms consists of --

Options    
Java Program and Applet    
Java API and JVM    
Java Widgets and Program    
Java Virtual Machine and Applets

Question No.  17
Which of the following are not logical operators?

Options    
>>    
&&    
!    
^

Question No.  18
Java was developed by--    
 
Options    
Microsoft    
Sun Microsystems    
Borland    
Siemens

Question No. 19
Which of the following variable is valid in Java?

Options    
variable1    
variable2_n    
variable=    
variable 4

Question No.  20
What is the result of the following operation?

 System.out.println (4 / 3)

Options    
6    
0    
1    
7

Question No.  21
To compile a java file, path should be set to--

           { c:\is the drive where jdk1.4 is installed}

Options    
c:\ jdk1.4\lib;    
c:\jdk1.4\bin;    
c:\jdk1.4\include;    
None of the above

Question No.  22
In java ________ is the top hierarchy of the classes.

Options    
Class Name    
Object    
Main Method    
Super Class    

Question No.  23
Using the keyword_____________, we can access value of the instance variables and class variables of that class inside the method of that class itself.

Options    
Super    
this    
final    
Either final or this

Question No.  24
The number of arguments or the types of arguments is to be different for creating two or more methods with the same name are in--

Options    
Inheritance    
Method overloading    
Method overriding    
Polymorphism    

Question No.  25
The keyword ‘new’ will--
 
Options    
Create an instance of a object    
Create the instance of a class    
Assigns a new value to the object    
Create new object by instantiating the class    

Question No.  26
What are the five layouts of AWT?

a)     BagGridLayout

b)    FlowLayout

c)     GridLayout

d)    BagLayout

e)     GridBagLayout

f)     CardLayout

g)    BorderLayout

Options    
b c e f g    
a b c d e    
f g e d a    
a c b g e    

Question No.  27
Events do not respond to--
Options    
Physical Action    
Logical Action    
Astrological Action    
All of the above

Question No.  28
Checkbox, Menu item, and choice List’s event can be handled by --

Options    
Adjustment Listener    
Item Listener    
Action Listener    
Text Listener    

Question No.  29
Signature of the method includes--   
Options    
Name of the Method    
List of parameters    
Return type of the method    
Only a) and b)    

Question No.  30
Break statement is used for--
Options    
To break the control of the program    
To stop the loop execution of a program    
To break the particular code execution    
To jump out of the loop

Question No.  31
Constructor method will be created--
Options    
While compiling    
While executing    
When object is created    
When class is created    

Question No.  32
Expansion of DNS is--
Options    
Distributed Name Service    
Domain Name System    
Domain Name Service    
Domain Navigation Service

Question No.  33
What do you mean by abstract class?
Options    
The class, which cannot have its sub classes    
A general class with name abstract    
The class cannot have its own instances of objects    
The classes used for implementations are called as abstract

Question No.  34
This is the java syntax to declare a subclass--

Options    
Class subclass: public super class    
Subclass extends super class    
Class subclass inherits super class    
Class subclass extends super class

Question No.  35
What tags are mandatory in HTML to display an applet?
                                               
Options    
Name, Height, Width    
Codebase, Height, Width    
Code, height, Width    
Code

Question No.  36
What do you mean by ‘literal’ in Java?

Options    
It is a keyword in Java    
All Java variables are called as literals    
It is a value assigned to primitive or abstract data type variables    
Literal is an object that exists and executed on the local machine    

Question No.  37
What do you mean by ‘literal’ in Java?       
 
Options    
It is a keyword in Java    
All Java variables are called as literals    
It is a value assigned to primitive or abstract data type variables    
Literal is an object that exists and executed on the local machine    

Question No.  38
Differentiation between component and container classes in Java is--  
 
Options    
Container is the super class of the components    
Components are the super class of the containers    
Component can hold only one object, whereas container can have single or collection of objects    
There is no difference at all    

Question No.  39
What do you mean by final method in Java?  

Options    
Name of the method defined    
Name of the class, of which this method is declared    
This is one, which cannot be overridden by ant subclasses    
This is the Java syntax to declare a subclass    

Question No.  40
The type of Java programs are--

Options    
Applications    
Applets    
Servlets    
Packages