This document contains instructions for 10 programming assignments related to arrays and strings, command line arguments, input/output, inheritance, and interfaces in Java. The assignments include: 1) Reading student exam results and performing calculations, 2) Extracting a portion of a character string, 3) Counting occurrences of a word in text, 4) Modifying a flexible string using StringBuffer, 5) Taking integer arguments and finding min/max, 6) Taking user input and printing a formatted message, 7) Reading user data using Scanner, 8) Creating classes using inheritance, 9) Creating shape subclasses that override an abstract area method, and 10) Implementing an interface in different classes.

1. Kalyani Govt. Engg. College
EE/6th
Sem/OOP-LAB (EE-694(c))/Assignment - 3
Due Date:- 30-04-2013
Arrays and Strings
1. The final examresultsof 10 studentsare tabulatedasfollows:
Name Roll e-mail Sub-1 Sub-2 Sub-3 Sub-4
123001
123002
…
123009
Write a program to read the data and determine the following:
a. Total marks obtained by each student.
b. Name and Roll of the students who obtained Maximum and Minimum total marks.
c. The highest marks in each subject and name & roll no. of that student.
2. Write a program to extract a portion of a character string and print the extracted string. Assume that m
characters are extracted, starting with the nth character.
3. Write a program that will read a text and count all occurrences of a particular word.
4. Create a flexible string (“Kalyani College”) using StringBuffer class. Print its length, each character and its
positions. Modify the string to “Kayani Govt. eng. College” and append the string “ is the best Engg. College.”
Modify “eng.” of the string to “Engg.”
Command Line Arguments and Input/Output
5. Write a program usingCommandLine Argumentswhichwill take some(mustbe greaterthan5) integervaluesas
inputfindthe largestandsmallestamongthemandalsoprintsthe number of arguments entered. The program
must prompt user if no arguments found or arguments less than 5.
6. Write a program usingInputStreamReaderandBufferdReaderclass thattakesinput:user-name, user-birth-year,
user-email. Prints “Hello ! <user-name>. You are <…>years old and your e-mail is: <abc@xyz.com>”.
7. Write a program using java.util.Scanner class to read Name, roll, marks obtained in 3 subjects(say Physics,
Chemistry and Maths) and Print those in the console.
Inheritance and Interfaces
8. Create the followingusing inheritance;make objectsof eachclass,accessmembers.
9. Make an abstract class shape havingthe following (intdim1,dim2; area()). Extend sub class Rectangle, triangle,
Square and override the area() method. Prepare objects and show their action.
10. Make an interface Area,implementAreainclassRectangle and inclass Circle.Illustrate bymakingobjectsof the
class.