I. Fundamentals of Java

1



Computer Lab
-

Practical Question Bank

FACULTY OF COMMERCE, OSMANIA UNIVERSITY

----------------------------------------------------------------------------------------------------------

B.Com
(Computer & Computer Applications) III Year

W.E.F.2010
-
11


FUN
DAMENTALS OF JAVA

Time: 60 Minutes







Record


:
10










Skill Test

:

20











Total Marks

:

30

1.

Write a program to demonstrate
the concept of Encapsulation.

2.

Write a program to demonstrate
the concept of Inheritance and polymorphism through
ove
rloading and overriding

3.

Write a program to define a class
Employee

with a constructor to keep track of the number
of objects of type
Employee

created. (Use a counter in the constructor)

4.

Write a program to display the following output using a single
print
s
tatement


Commerce= 99


Economics= 90


Maths= 100

5.

Using JOptionPane class

in the swing package
, w
rite a program to read two numbers from
the keyboard
through the InputDialogs
and display larger value on the screen

in a message
dialog.

6.

Write a program to c
onvert given number of days into months and days.


7.

Write a program to display details of student based on average as shown below

a.

If average is greater than or equal to 60
----
print first class

b.

If average is greater than or equal to 50 and less than 60
----
print second class

c.

If average is greater than or equal to 35 and less than 50
----
print third class

d.

If average is less than 35
-----
print failed.

Use Swing Package’s JOptionPane to take the inputs and show the resultant class.


8.

Write a program that request
s two float type numbers from the user divide the first by the
second and display the result along with the numbers.

Use JOptionPane class of the swing
package.

9.

Write a
java
program to
demonstrate the concepts of pass by value and pass by reference.

10.

Write
a java program with a class that has a method called
swap(int a, int b)
that takes in
two arguments and swaps the contents of each other.

Use call by reference to achieve actual
swapping.

11.

Write a
java
program
with a class which has the following members


Methods



getSimpleInterest( )



getCompoundInterest( )


Variables


P
–

Principal


r
–

Rate of Interest


n
–

No. of years
.

2


12.

Write a java program with a class that input string as a member with the following methods;



getInputString()
–

To display the str
ing



getReverseString()
–

To display the reverse of the string



getLength()
–

To find out the length of the string.


13.

Write a
java program with a class

Matrix

for representing a 2
-
dimensional integer matrix
along with a few operations. The class should have
the following members


Variables:



2
-
dimensinal Array A[][]

Methods:



getNonZeroElements

()
–

To print all the non
-
zero elements of the array



getElement(int row, int col)
–

To get the
element at the position of A[row][col]. Handle


the
IndexOutOfBoundsExce
ption

for the arguments row and col


14.

For the above method add another method


getSumofElements( )
–

get the sum of all the elements of the array.


getAverage(

)
-

get the average of all the elements of the array.

15.

Add another method to the above class
to
find
the standard deviation
of all the elements of an
integer array


getStdDev()
.

16.

Write a java applet program that accepts the coordinates of two points and draw a line
between the two points The point is represented by the coordinates (x,y).

17.

Add a method

to the
Matrix

class to display
the elements of a 2
-
dimensional array in the
form of a matrix.


18.

Write a
java class
Fibonacci

with a method
to
print the 1
st

k

numbers in the Fibonacci series.



Note:

( f(n) = f(n
-
1) + f(n
-
2)

Fibonacci series is 1,1,2,3,5,8
,13,21…….)

19.

Write a program to input “
n”
numbers and find the number of +ve and
–
ve numbers in the
inputted numbers.

20.

Add a method to the
Matrix

class
to add two matrices and output the resultant
matrix.

21.

Add a method to the
Matrix

class to

search for a given

input element in the matrix and return
true or false based on the search.



boolean
Search
(int element)

22.

Write a program to accept the marks of 10 students and display their grades based on the
following criterion


Range

Grade

< 40

F

40
-
50

D

50
-
60

C

60
-
70

B

> 70

A


23.

Write a program to
find the sum of the 1
st

N natural numbers given the input N.

Implement in
the form a method of a java class.

24.

Write a program to input the profits of a company for the last 10 years. Find the maximum,
minimum and the avera
ge profit attained during this tenure.

Implement methods for finding
each of them.

3


25.

Write a program to input the total amount of profit from the keyboard and find the amount of
profit to be distributed to three partners with profit sharing ratio of 2:3:5.

26.

W
rite a program to compute the income tax payable given the amount of taxable income as
input from the keyboard.


Assume the following slab rates of tax






Income

Rate

0
-

1,60,000


Nil

1,60,000
-

3,00,000


10%

3,00,000
-

5,00,000


20%

>5,00,000


30%






27.

Write a program by switch statement to

a.

Print “hai” if entered one

b.

Print “hello” if entered two

c.

Print “how are you” if entered three

d.

Print “bye” if any other number.


28.

Write a
java class
Number

with the following members


A positive intege
r number
num

29.

Add a method to the
Number

class to display all the 1
st

n multiples of the given number


getFirstNMultiples

(int n )

30.

Add a method to the Number class to

display
all the
factors of a given number
.


getFactors( )

31.
Write a user define
d exception that extends the
Exception

class

an
d handles the
D
ivideB
yZero

Exception.

32.

Write a
java applet that accepts the size of a square and fill it with red color.

33.

Add a method to the
Number

to
find
the
factorial of a given number
.

34.

Add a met
hod to the
Number

class to
check
whether
the
given number is prime
or not.

35.

Write a java program to extend the
Thread

class with two threads running in parallel one to
print the numbers and the other to print the alphabets.

36.

Write a java class that e
xtends the
Thread

class which calculates the sum of all the 1
st

50
even natural numbers.


37.
Write a program to display the following figure



*

* *

* * *

* * * *

38.

Write a program to display a larger number among two numbers
using conditional operator.

39.

Write a program to output the
Cost of Production
given the following inputs

No. of units of goods manufactured

Variable Cost per unit

Fixed Cost of Production

Wages

4


40.

Write a program Input 10 numbers through keyboard into

an array and find if a given input
number to be searched is present in the array.

41.

Write a program to convert a given input sum of money in rupees to foreign currency in
terms of

US dollars,

Australian Dollars,

Dinar

Pounds

Assume the current excha
nge rates.

42.

Define a structure,
student

which contains student name, age, marks.


Using this structure write a program to read this information for one person from keyboard
and print the same on the screen.

43.

Write a java program with a class and a me
thod which finds if a given inpu
t number is
divisible by 2,3,5
and returns true or false.

44.

Write a program to declare a class
Company

with members Company Name, No. of
employees, date of Incorporation, List of Directors (Array of strings)

45.

Write a ja
va interface
Quadrilateral

and two classes
Rectangle

and S
quare
that derive from
the
Quadrilatera
l class.

46.

Write two methods for finding the area and perimeter of a
Quadrilateral

and Implement the
methods for the derived classes
Rectangle

and
Square
.

47
.

Define a
Employee

class with the members EmpId, FirstName, MiddleName, LastName,
Age, Salary and a constructor which takes the EmpId as argument. Write a program to
declare two objects of type
Employee

class.

48.

Define a class
Rectangle
with two members

length and breadth as integers. Define two
constructors one which takes a single argument (Square) and the other which takes 2
arguments (Rectangle). Declare two objects using both the constructors

49.

Define a class
PartnershipFirm
with the members Firm
Name, Capital, No. of members,
Type of business. Define a constructor and destructor for the class to keep track of the no. of
objects of type
PartnershipFirm

that are present


Hint: Use increment, decrement operators in the constructors, destructors respe
ctively.

50.

Write a program to demonstrate
some of the string
functions.

Use functions in both the class
String

and
StringBuffer.




*****