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1 Q) Write a program to read and display the information about a book using the following relationship. Solution: import java.io.*; class Author String name,nationality,s; InputStreamReader r = new InputStreamReader(System.in); BufferedReader input = new BufferedReader (r); void readauthor() throws IOException System.out.println("ENTER AUTHOR NAME"); name = input.readline(); System.out.println("ENTER NATIONALITY"); Khateeb Engineering Classes : / Page 1

2 nationality = input.readline(); void displayauthor() System.out.println("NAME :" + name); System.out.println("NATIONALITY :" + nationality); class Book extends Author String title; int nop,price; void readbook() throws IOException System.out.println("ENTER BOOK NAME"); title = input.readline(); System.out.println("ENTER NO OF PAGES"); s = input.readline(); nop = Integer.parseInt(s); System.out.println("ENTER PRICE"); s = input.readline(); price = Integer.parseInt(s); void displaybook() System.out.println("TITLE :" + title); System.out.println("NO OF PAGES :" + nop); System.out.println("PRICE :" + price); class Execution Khateeb Engineering Classes : / Page 2

3 public static void main(string args[])throws IOException Book b = new Book(); b.readauthor(); b.readbook(); b.displayauthor(); b.displaybook(); Q) Write a program to read and display the following information about a student using inheritance. Library details: Name,Rno,No.of books Exam details : Name,rno,total Solution: import java.io.*; class Data int rno; String name,s; InputStreamReader r = new InputStreamReader (System.in); BufferedReader input = new BufferedReader (r); void accept() throws IOException System.out.println("ENTER RNO"); s= input.readline(); Khateeb Engineering Classes : / Page 3

4 rno = Integer.parseInt(s); System.out.println("ENTER NAME"); name = input.readline(); void display() System.out.println("NAME:" + name); System.out.println("RNO :" + rno); class Library extends Data int nob; void accept1()throws IOException System.out.println("ENTER NUMBER OF BOOKS"); s= input.readline(); nob = Integer.parseInt(s); void display1() System.out.println("NOB :" + nob); class Exam extends Data Khateeb Engineering Classes : / Page 4

5 int t; void accept2() throws IOException System.out.println("ENTER TOTAL"); s= input.readline(); t = Integer.parseInt(s); void display2() System.out.println("TOTAL :"+t); class Execute public static void main(string[ ] args)throws IOException int option; String s; InputStreamReader r = new InputStreamReader (System.in); BufferedReader input = new BufferedReader (r); System.out.println("MENU"); System.out.println("1.LIBRARY"); System.out.println("2.EXAM"); s = input.readline(); Khateeb Engineering Classes : / Page 5

6 option = Integer.parseInt(s); switch(option) case 1: Library p = new Library(); p.accept(); p.accept1(); p.display(); p.display1(); break; case 2: Exam e = new Exam(); e.accept(); e.accept2(); e.display(); e.display2(); break; Q) WAP to calculate the following using interfaces, 1) area of circle 2) volume of a sphere Solution: import java.util.scanner; interface display1 double pi=3.14; Khateeb Engineering Classes : / Page 6

7 Scanner read=new Scanner(System.in); void compute(); void display(); class Circle implements display1 double r,area; public void compute() System.out.println("ENTER RADIUS"); r=read.nextdouble(); area=pi*r*r; public void display() System.out.println("AREA="+area); class Sphere implements display1 double r,vol; public void compute() System.out.println("ENTER RADIUS"); r = read.nextdouble(); vol = (4 *pi*r*r*r)/3; Khateeb Engineering Classes : / Page 7

8 public void display() System.out.println("Volume =" + vol); abstract class runtime implements display1 public static void main(string[] args) int option; System.out.println("MENU"); System.out.println("1.Area of a circle"); System.out.println("2. Volume of a sphere"); System.out.println("Enter option"); option = read.nextint(); switch (option) case 1: Circle c = new Circle(); c.compute(); c.display(); break; case 2: Sphere s = new Sphere(); s.compute(); s.display(); break; Khateeb Engineering Classes : / Page 8

9 Q) Write a program to implement the following relationship. Solution: import java.io.*; class Teacher String name,subject,s; double salary; InputStreamReader r = new InputStreamReader(System.in); BufferedReader input = new BufferedReader(r); Khateeb Engineering Classes : / Page 9

10 void readdata()throws IOException System.out.println("ENTER TEACHER NAME"); name = input.readline(); System.out.println("ENTER SALARY"); s = input.readline(); salary = Double.parseDouble(s); System.out.println("ENTER SUBJECT"); subject = input.readline(); void displaydata() System.out.println("NAME :"+ name); System.out.println("SALARY :"+ salary); System.out.println("SUBJECT :"+ subject); interface Musician public void readinstrument()throws IOException; public void displayinstrument(); class MusicTeacher extends Teacher implements Musician String institute, instrumentname; public void readinstitute()throws IOException System.out.println("ENTER INSTITUTE NAME"); institute = input.readline(); public void displayinstitute()throws IOException System.out.println("INSTITUTE NAME :"+ institute); Khateeb Engineering Classes : / Page 10

11 public void readinstrument()throws IOException System.out.println("ENTER INSTRUMENT NAME"); instrumentname = input.readline(); public void displayinstrument() System.out.println("INSTRUMENT NAME :"+ instrumentname); class Execute public static void main(string args[])throws IOException MusicTeacher m = new MusicTeacher(); m.readdata(); m.readinstrument(); m.readinstitute(); m.displaydata(); m.displayinstrument(); m.displayinstitute(); Khateeb Engineering Classes : / Page 11