Exp 6: Develop Java programs to implement Interfaces and Packages. Apply Exception handling and implement multithreaded programs.

Transcription

1 CO504.3 CO504.4 Develop Java programs to implement Interfaces and Packages. Apply Exception handling and implement multithreaded programs. CO504.5 CO504.6 Implement Graphics programs using Applet. Develop Java programs using File I/O. Exp 6: 1) WAP to create a class Book having data members author, title, publisher. Derive a class BookInfo having data members price, stock position and a method show(). Initialize and display information for 3 objects of BookInfo. class book String author,title,publisher; book(string t1,string a1,string p1) author=a1; title=t1; publisher=p1; class bookinfo extends book int price,s_p; bookinfo(string t1, String a1, String p1, int p,int sp) super(t1,a1,p1); price=p; s_p=sp; void show() System.out.println("Title: "+title); System.out.println("Author: "+author); System.out.println("Publisher: "+publisher); System.out.println("Price: Rs."+price); System.out.println("Stock Position: "+s_p);

2 public static void main(string args[]) bookinfo b1=new bookinfo("harry Potter","J.K. Rowling","Bloomsbury",500,1); bookinfo b2=new bookinfo("twilight","stephenie Meyer","Atom",150,2); bookinfo b3=new bookinfo("master Of The Game","Sidney Sheldon","Harper",800,3); b1.show(); b2.show(); b3.show(); 2) WAP to create a class Bird having data members category and a method show(). Derive a class Parrot having data members no_of_parrots and a method show(). Initialize using constructor and display the information. class bird String category; bird(string c) category=c; void show() System.out.println("Category: "+category); class parrot extends bird int no; parrot(string c,int n) super(c); no=n; void show() System.out.println("Category: "+category); System.out.println("No. of Parrots: "+no);

3 public static void main(string args[]) parrot p=new parrot("parakeet",1000); p.show(); Exp 7: 1) Define a package named useful with a class name useme having following methods: i) area()-to calculate area of given shape ii) salary()-to calculate salary iii) percentage()- To calculate percentage package useful; import java.io.*; public class useme BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); int r; float a; public void area()throws IOException System.out.println("Enter Radius: "); r=integer.parseint(br.readline()); a=r*r*3.14; System.out.println("Area: "+a); int bsal, hra,da,sal; public void salary()throws IOException System.out.println("Enter Basic Salary: "); bsal=integer.parseint(br.readline()); System.out.println("Enter HRA: "); hra=integer.parseint(br.readline()); System.out.println("Enter DA: "); da=integer.parseint(br.readline()); sal= bsal+ hra+da; System.out.println("Salary: "+sal);

4 int m1,m2,tot; float per; public void per()throws IOException System.out.println("Enter M1: "); m1=integer.parseint(br.readline()); System.out.println("Enter M2: "); m2=integer.parseint(br.readline()); tot=m1+m2; per=(tot/2)*100; System.out.println("Percentage: "+per); import useful.useme; import java.io.*; public static void main(string arg[])throws IOException useme u=new useme(); u.area(); Exp 8 1) WAP to accept password from the user and throw Authentication Failure! expection if the password is incorrect. import java.io.*; class myexception extends Exception myexception(string msg) super(msg); public static void main(string args[])throws IOException BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); try System.out.println("Enter Password: ");

5 String s1=br.readline(); String s2="tyco"; if(s1.compareto(s2)!=0) throw new myexception ("Authentication Error!"); catch(exception e) System.out.println(e); 2) WAP to accept a number from the user and throw an exception if the number is not even. import java.io.*; class myexception extends Exception myexception(string msg) super(msg); public static void main(string args[])throws IOException BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); try System.out.println("Enter Number: "); int n=integer.parseint(br.readline()); if((n%2)!=0) throw new myexception ("Number Not Even!"); catch(exception e) System.out.println(e);

6 Exp 9 1) WAP to create 2 threads such that one thread will print odd numbers and the other thread will print even numbers from 1 to 20. class A extends Thread public void run() System.out.println("This is Thread A"); for(int i=1;i<=20;i++) if(i%2==1) System.out.println(i); class B extends Thread public void run() System.out.println("This is Thread B"); for(int i=1;i<=20;i++) if(i%2==0) System.out.println(i); public static void main(string args[]) A a=new A(); B b=new B(); a.start(); b.start(); 2. WAP to create 2 threads such that one thread will print numbers from 1 to 10 & other reads numbers from 10 to 1. First thread should transfer control to second thread after printing

7 second number. class A extends Thread public void run() System.out.println("This is Thread A"); try for(int i=1;i<=10;i++) System.out.println("Printing Numbers from 1 to 10:"); System.out.println(i); sleep(1000); catch(exception e) class B extends Thread public void run() System.out.println("This is Thread B"); try for(int i=10;i>=1;i--) System.out.println("Printing Numbers from 10 to 1:"); System.out.println(i); sleep(1000); catch(exception e) public static void main(string args[]) A a=new A(); B b=new B(); a.start(); b.start();

8 Exp 10 1) WAP to draw a circle inside a round rectangle public class Main extends Applet g.drawroundrect(100,60,270,140,30,30); g.drawoval(180,100,100,70); <APPLET CODE="Main.class" WIDTH="800" HEIGHT="500"> </APPLET> 2) WAP to draw a Diamond public class Main extends Applet g.drawline(50,10,20,50); g.drawline(20,50,50,90); g.drawline(50,90,80,50); g.drawline(80,50,50,10); <APPLET CODE="Main.class" WIDTH="800" HEIGHT="500"> </APPLET>

9 3) WAP to draw a right angled triangle public class Main extends Applet g.drawline(50,10,20,50); g.drawline(20,50,50,90); g.drawline(50,90,80,50); g.drawline(80,50,50,10); <APPLET CODE="Main.class" WIDTH="800" HEIGHT="500"> </APPLET> 4) WAP to draw a Smiley public class Main extends Applet g.drawoval(10,40,160,160); g.filloval(50,70,30,30); g.filloval(100,70,30,30); g.drawarc(45,130,90,50,180,170); <APPLET CODE="Main.class" WIDTH="800" HEIGHT="500"> </APPLET> 5) WAP to accept a string from the user and print it on the screen in the following format: Font: Times New Roman Style: Bold Italics Font Size: 14 public class tan extends Applet

10 String msg; public void init() msg=getparameter("str"); msg="welcome To" + msg; g.drawstring(msg,50,50); <applet code="tan.class" width="500" height="500"> <param name="str" value=" Java Applet."> </applet> 6) WAP to accept a string from the user as parameter and print it on the screen. public class tan extends Applet String msg; public void init() msg=getparameter("str"); msg="welcome To" + msg; g.drawstring(msg,50,50); <applet code="tan.class" width="500" height="500"> <param name="str" value=" Java Applet."> </applet>