BT0074, OOPS with JAVA

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ASSIGNMENT

PROGRAM	BScIT
Semester	3
SUBJECT CODE & NAME	BT0074, OOPS with JAVA
CREDIT	4
BK ID	B 1002
MAX.MARKS	60

Note: Answer all questions. Kindly note that answers for 10 marks questions should be approximately of 400 words. Each question is followed by evaluation scheme.

Question1. Describe the features of java programming language.

Answer: Various features of programming language are:

Simple:

·         Java is Easy to write and more readable and eye catching.

·         Java has a concise, cohesive set of features that makes it easy to learn and use.

·         Most of the concepts are drew from C++ thus making Java learning simpler.

Secure :

Question2. Explain any four function can be used for string comparison. Write a program to reverse a string.

Answer: String Comparison Functions are :

Comparison	Primitives	Objects
a == b, a != b	Equal values	Compares references, not values. The use of == with object references is generally limited to the following: ·         Comparing to see if a reference is null. ·         Comparing two enum values. This works because there is only one object for each enum constant.

Question 3. Describe with the help of an example the implementation of inheritance.

Answer: : Inheritance in Java is an Object oriented or OOPS concepts, which allows to emulate real world Inheritance behavior, Inheritance allows code reuse in Object oriented programming language e.g. Java. Along with Abstraction, Polymorphism and Encapsulation, Inheritance forms basis of Object oriented programming. Inheritance is implemented using extends keyword in Java and When one Class extends another Class it inherit all non private members including fields and methods. Inheritance in Java can be best understand in terms of Parent and Child class, also known as Super class and Sub class in Java programming language. The class which extends

Question 4. Describe the catch and finally block statement with examples.

Answer:

·         A finally statement must be associated with a try statement. It identifies a block of statements that needs to be executed regardless of whether or not an exception occurs within the try block.

·         After all other try-catch processing is complete, the code inside the finally block executes. It is not mandatory to include a finally block at all, but if you do, it will run regardless of whether an exception was thrown and handled by the try and catch parts of the block.

·         In normal execution the finally block is executed after try block. When any exception occurs first the catch block is executed and then

Question 5. Write a note on random access files and serialization concept.

Answer: Serialization with a random access file, but  have to build the infrastructure yourself. There is no way to get the size of serialization without actually serializing.

We  want to store multiple serialized objects in the same file, so you'll need to do something like:

·         Store the serialized objects, keeping track of the offsets within the stream until the end, and then write a table of contents at the end of the file. This is similar to the zip file format.

·         Write "placeholder" bytes for the size, then

2. The JDBC URL

Answer: The programming involved to establish a JDBC connection is fairly simple. Here are these simple four steps −

Import JDBC Packages: Add import statements to your Java program to import required classes in your Java code.

3. The ResultSet Object

Answer: The SQL statements that read data from a database query, return the data in a result set. The SELECT statement is the standard way to select rows from a database and view them in a result set. The java.sql.ResultSet interface represents the result set of a database query.

A ResultSet object maintains a cursor that points to the current row in the result set. The term "result set" refers to the row and column data contained in a ResultSet object.

The methods of the ResultSet interface can be

4. Using the PreparedStatement Object

Answer: Once a connection is obtained we can interact with the database. The JDBC Statement, CallableStatement, and PreparedStatement interfaces define the methods and properties that enable you to send SQL or PL/SQL commands and receive data from your database.

They also define methods that help bridge data type differences between Java and SQL data types used in a database.

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