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MCS-024 Object Oriented Technologies and Java Programming Solved Assignment 2019-2020 Q1. (a)   Explain basic concepts of Object Oriented Programming? Explain how data hiding is achieved.    Answer:- Object-Oriented Programming is a methodology or paradigm to design a program using classes and objects. It simplifies the software development and maintenance by providing some concepts: ·          Object -  Any entity that has state and behaviour is known as an object. An Object can be defined as an instance of a class. ·          Class -  Collection of objects is called class. It is a logical entity. A class can also be defined as a blueprint from which you can create an individual object. Class doesn't consume any space. ·          Inheritance -  When one object acquires all the properties and behaviours of a parent object, ...

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Q1. (a) What is the need of modulating a signal? Will it be a right approach to send the    information as the signal itself?    Ans:   Modulation is the process of mixing a low energy message signal with the high energy carrier signal to produce a new high energy signal which carries information to a long distance. Modulation is the process of changing the characteristics (amplitude, frequency or phase) of the carrier signal, in accordance with the amplitude of the message signal. A device that performs modulation is called modulator.  Need for Modulation Modulation is extremely necessary in communication system because of the following reasons: 1) Avoids mixing of signals 2) Increase the range of communication 3) Wireless communication 4) Reduces the effect of noise 5) Reduces height of antenna Q1.  (b) Explain techniques used in digital to analog modulation with the help of diagram. Ans: Coming Soon... Q2. (a) Discuss the...

LAB Course Solved Section A: Object Oriented Analysis and Design   Question 1: As online commerce is increasing, many organizations are setting up online digital payment system which work as follows:  (i) A costumer does shopping on any shopping site with a credit card or a debit card. A credit card and debit card is issued to any person after verification of all details by a bank such as identity card and the salary statement for the last six months.  (ii) Purchasing detail goes through a payment gateway which encrypts the data to keep it private  and send it to the payment processor   (iii) The payment processor sends a request to the costumer’s issuing bank to check whether they have enough credit to pay for the purchased items (iv) The issuing bank responds with a yes (a approval) or no (a denial)    (v) The payment processor sends the answer back to the costumer’s merchant bank to credit the account in the name of a costumer...

Java is an Object Oriented Programming language, supported by various classes. The Applet class is packed in the Java. Applet package which has several interfaces. These interfaces enable the creation of Applets, interaction of Applets with the browser, and playing audio clips in Applets. In Java 2, class Javax.swing.  JApplet is used to define an Applet that uses the Swing GUI components.  Applet is a special type of program that is embedded in the webpage to generate the dynamic content. It runs inside the browser and works at client side.  Applet is embedded in a HTML page using the APPLET or OBJECT tag and hosted on a web server. Applets are used to make the web site more dynamic and entertaining. Below is the list given for Do’s and Don’ts of Java Applets:  Do’s  • Draw pictures on a web page   • Create a new window and draw the picture in it.   •Play sounds.   • Receive input from the user through the keyboard ...

Let us take two problems A and B both are NP problems. Reducibility - If we can convert one instance of a problem A into problem B (NP problem) then it means that A is reducible to B. NP-hard - Now suppose we found that A is reducible to B, then it means that B is at least as hard as A. NP-Complete - The group of problems which are both in NP and NP-hard are known as NP-Complete problem. P  is set of problems that can be solved by a deterministic Turing machine in  P olynomial time. NP  is set of decision problems that can be solved by a  N on-deterministic Turing Machine in  P olynomial time. P is subset of NP