B.Sc (Computer Science) Object Oriented Programming with Java and Data Structures Lab Programs

Transcription

1 B.Sc (Computer Science) Object Oriented Programming with Java and Data Structures Lab Programs 1 1. Write a java program to determine the sum of the following harmonic series for a given value of n. 1+1/2+1/3+... _1/n class Prog1 BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); System.out.println("Enter the value of n for Harmonic Series"); int n=integer.parseint(br.readline()); double sum=0.0; for(int i=1;i<=n;i++) sum=sum+1.0/i; System.out.println("Total of Harmonic Series upto" +n+ "=" + sum); 2. Write a program to perform the following operations on strings through interactive input. a) Sort given strings in alphabetical order. b) Check whether one string is sub string of another string or not. c) Convert the strings to uppercase. a) class Prog2a System.out.println("Enter number of strings:"); int n=integer.parseint(br.readline()); System.out.println("Enter " + n + " String:"); String name[]=new String[n]; for(int i=0;i<n;i++) name[i]=br.readline(); System.out.println(" "); String temp=null; for(int i=0;i<name.length;i++) for(int j=i+1;j<name.length;j++) if(name[j].compareto(name[i])<0)

2 temp=name[i]; name[i]=name[j]; name[j]=temp; 2 System.out.println("Sorted Strings:"); System.out.println(" "); for(int i=0;i<name.length;i++) System.out.println(name[i]); b) class Prog2b System.out.println("Enter the Main String:"); String m=br.readline(); System.out.println("Enter the Sub String:"); String s=br.readline(); int index=m.indexof(s); if (index!= -1) System.out.println("It is a sub string"); else System.out.println("No. It is not a sub string"); c) class Prog2c System.out.println("Enter number of strings:"); int n=integer.parseint(br.readline()); System.out.println("Enter " + n + " String:"); String name[]=new String[n]; for(int i=0;i<n;i++) name[i]=br.readline(); System.out.println(" "); for(int i=0;i<n;i++) name[i]=name[i].touppercase(); System.out.println("Strings in Uppercase");

3 System.out.println(" "); 3 for(int i=0;i<name.length;i++) System.out.println(name[i]); 3. Write a program to simulate on-line shopping. class OnlineShopping public static void main(string args[]) throws Exception int i=0,n,borrow,sum=0; String con=""; int a[]=new int[10]; String name[]=new String[10]; String s[]="c Programming","Java","DBMS","Web Technologies"; int price[]=200,250,300,350; do System.out.println("Select Books from the list:\n"); System.out.println(" 1.C Programming-Rs.200"); System.out.println(" 2.Java-Rs.250"); System.out.println(" 3.DBMS-Rs.300"); System.out.println(" 4.Web Technologies-Rs.350"); System.out.println("\nSelect the book number:"); n=integer.parseint(br.readline()); n--; if(n<0 n>3) System.out.println("Invalid"); break; a[i]=n; System.out.println("Enter your name:"); name[i]=br.readline(); i++; System.out.println("Continue?(y,n):"); con=br.readline(); while(con.equals("y")); borrow=i; if(borrow>0) System.out.println("****************************************"); System.out.println("\nName \t Book Purchased"); System.out.println("****************************************"); for(i=0;i<=n;i++)

4 if(name[i]!=null) 4 if(a[i]==0) sum=sum+200; else if(a[i]==1) sum=sum+250; else if(a[i]==2) sum=sum+300; else if(a[i]==3) sum=sum+350; System.out.println(name[i]+"\t"+s[a[i]]); System.out.println("Total Price=" + sum); System.out.println("****************************************"); 4. Write a program to identify duplicate value in a vector. import java.util.vector; class Prog4 Vector v=new Vector(); System.out.println("Enter the number of values to insert into Vector"); int n=integer.parseint(br.readline()); System.out.println("Enter " + n + " values:"); for(int i=0;i<n;i++) v.addelement(br.readline()); System.out.println(" Duplicate values are "); for(int i=0;i<n;i++) for(int j=i+1;j<n;j++) if(v.elementat(j).equals(v.elementat(i))) System.out.println(v.elementAt(j)); 5. Create two threads such that one of the thread print even no s and another prints odd no s up to a given range. class Even extends Thread int x,y; public Even(int a,int b) x=a; y=b; public void run()

5 for(int i=x; i<=y; i++) if(i%2==0) System.out.println("Even Number " + i); 5 class Odd extends Thread int x,y; public Odd(int a,int b) x=a; y=b; public void run() for(int j=x; j<=y; j++) if(j%2!=0) System.out.println("Odd number " + j); class Prog5 System.out.println("Enter Starting value"); int r1=integer.parseint(br.readline()); System.out.println("Enter Ending value"); int r2=integer.parseint(br.readline()); Even e=new Even(r1,r2); Odd o=new Odd(r1,r2); e.start(); o.start(); 6. Define an exception called MarksOutOfBound Exception that is thrown if the entered marks are greater than 100. class MarksOutOfBound extends Exception MarksOutOfBound(String s) super(s);

6 6 class Prog6 try System.out.println("Enter student name:"); BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); String name=br.readline(); System.out.println("Enter the marks in Java:"); int marks=integer.parseint(br.readline()); if (marks>100) throw new MarksOutOfBound("Marks should not be greater than 100."); System.out.println("Entered marks: " + marks+ " is valid"); catch (MarksOutOfBound mb) System.out.println(mb.getMessage()); 7. Write a program to shuffle the list elements using all possible permutations. import java.util.*; class Prog7 BufferedReader br = new BufferedReader(new InputStreamReader (System.in)); System.out.print("How many elements you want to add to the list: "); int n = Integer.parseInt(br.readLine()); System.out.println("Enter " + n + " numbers"); List Y = new ArrayList(n); for(int i = 0; i < n; i++) Y.add(br.readLine()); System.out.println("List:"+ Y); int fact=1; for(int j=1;j<=n;j++) fact=fact*j; int count=0; for(int i = 0; i < fact; i++) Collections.shuffle(Y); System.out.println("List:"+Y);

7 count++; System.out.println("The number of possible permutations=" + count); 7 8. Create a package called Arithmetic that contains methods to deal with all arithmetic operations. Also, write a program to use the package. package Arithmetic; public class Prog8 public int add(int a,int b) return a+b; public int sub(int a,int b) return a-b; public int mult(int a,int b) return a*b; public double div(int a,int b) return a/b; import Arithmetic.Prog8; public class Prog8a System.out.println("Enter the values of A and B:"); int a=integer.parseint(br.readline()); int b=integer.parseint(br.readline()); Prog8 p=new Prog8(); System.out.println("Addition=" + p.add(a,b)); System.out.println("Subtraction=" + p.sub(a,b)); System.out.println("Multiplication=" + p.mult(a,b)); System.out.println("nDivision=" + p.div(a,b));

8 8 9. Write an Applet program to design a simple calculator. import java.applet.*; import java.awt.*; import java.awt.event.*; public class Calc extends Applet implements ActionListener String cmd[]="+","-","*","/","=","c"; int pv=0; String op=""; Button b[]=new Button[16]; TextField t1=new TextField(10); public void init() setlayout(new BorderLayout()); add(t1,"north"); t1.settext("0"); Panel p=new Panel(); p.setlayout(new GridLayout(4,4)); for(int i=0;i<16;i++) if(i<10) b[i]=new Button(String.valueOf(i)); else b[i]=new Button(cmd[i%10]); b[i].setfont(new Font("Arial",Font.BOLD,25)); p.add(b[i]); add(p,"center"); b[i].addactionlistener(this); public void actionperformed(actionevent ae) int res=0; String cap=ae.getactioncommand(); int cv=integer.parseint(t1.gettext()); if(cap.equals("c")) t1.settext("0"); pv=0; cv=0; res=0; op=""; else if(cap.equals("=")) res=0; if(op=="+") res=pv+cv; else if(op=="-") res=pv-cv; else if(op=="*") res=pv*cv; else if(op=="/") res=pv/cv; t1.settext(string.valueof(res));

9 else if(cap.equals("+") cap.equals("-") cap.equals("*") cap.equals("/")) pv=cv; op=cap; t1.settext("0"); else int v=cv*10+integer.parseint(cap); t1.settext(string.valueof(v)); Write a program to read a text and count all the occurrences of a given word. Also, display their position. import java.lang.string; public class Prog10 public static void main(string args[]) throws IOException System.out.println("Enter the Text:"); String m=br.readline(); System.out.println("Enter the word to search:"); String s=br.readline(); int index = m.indexof(s); int len = s.length(); int count = 0; if (len > 0) while (index!= -1) count++; System.out.println("Found at position:" + index); index = m.indexof(s, index+len); if(count!=0) System.out.println("The number of occurrences of the given word is: " + count); else System.out.println( Word does not exist ); 11. Write an applet illustrating sequence of events in an applet. import java.awt.*; import java.applet.applet; public class Prog11 extends Applet String msg; public void init() setbackground(color.cyan); setforeground(color.blue);

10 msg=" Init()"; 10 public void start() msg= msg + " Start()"; public void paint(graphics g) msg= msg + " Paint()"; g.drawstring(msg, 100,100); showstatus("this is displyed in status window"); public void destroy() msg= msg + " Destroyed()"; 12.Illustrate the method overriding in Java class A int i; A(int a, int b) i = a+b; void add() System.out.println("Sum of a and b is: " + i); class B extends A int j; B(int a, int b, int c) super(a, b); j = a+b+c; void add() super.add(); System.out.println("Sum of a, b and c is: " + j); class Prog12 public static void main(string args[]) B b = new B(10, 20, 30); b.add();

11 11 13.Write a program to fill elements into a list. Also, copy them in reverse order into another list. import java.util.*; class Prog13 BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); System.out.println("How many elements you want to add to the list: "); int n = Integer.parseInt(br.readLine()); System.out.println("Enter " + n + " elements"); List Y = new ArrayList(n); for(int i = 0; i < n; i++) Y.add(br.readLine()); System.out.println("List:"+ Y); Collections.reverse(Y); System.out.println("Reverse List:"+ Y); List revlist= new ArrayList(n); for(int i=0;i<n;i++) revlist.add(y.get(i)); System.out.println("List 2:"+ revlist); 14.Write an interactive program to accept name of a person and validate it. If the name contains any numberic value throw an exception InvalidName class invname extends Exception invname(string s) super(s); class Prog14 try System.out.println("Enter student name:"); BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); String name=br.readline(); for(int i=0;i<name.length();i++) if (Character.isDigit(name.charAt(i)))

12 text"); throw new invname("string contains numeric value."); System.out.println("Entered Stirng : " + name + " contains only catch (invname in) System.out.println(in.getMessage()); Write an applet program to insert the text at the specified position. import java.awt.*; import java.applet.*; import java.awt.event.*; public class Prog15 extends Applet implements ActionListener TextArea ta=new TextArea("",2,20); TextField t1=new TextField(10); TextField t2=new TextField(10); Button b1=new Button("Insert"); public void init() add(t1); add(t2); add(b1); add(ta); b1.addactionlistener(this); public void actionperformed(actionevent ae) ta.insert(t1.gettext(),1); ta.insert(t2.gettext(),6); 16.Prompt for the cost price and selling price of an article and display the profit (or) loss percentage. class Prog16 System.out.println("Enter the cost price:"); BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

13 double cost=double.parsedouble(br.readline()); System.out.println("Cost Price:" + cost); System.out.println("Enter the Selling price:"); double sell=double.parsedouble(br.readline()); System.out.println("Selling Price:" + sell); if(cost>sell) System.out.println("Loss=" + (cost-sell)); System.out.println("Loss Percentage=" + ((costsell)/cost)*100); 13 System.out.println("Profit=" + (sell-cost)); System.out.println("Profit Percentage=" + ((sellcost)/cost)*100); else 17.Create an Anonymous array in Java public class AnonymousArrayExample public static void main(string args[]) System.out.println( Length of array is + findlength(new int[]1,2,3)); public static int findlength(int[] array) for(int i=0;i<array.length;i++) System.out.println(array[i]); return array.length; 18. Create a font animation application that change the colors of text as and when prompted. import java.applet.*; import java.awt.*; import java.awt.event.*; public class Prog18 extends Applet implements ActionListener Button b1=new Button("Change Color"); int r=0,g=0,b=0; public void init() add(b1);

14 b1.addactionlistener(this); setfont(new Font("Arial",Font.BOLD,30)); 14 public void actionperformed(actionevent ae) r=(int)(math.random()*255); g=(int)(math.random()*255); b=(int)(math.random()*255); repaint(); public void paint(graphics gr) setbackground(new Color(125,34,67)); gr.setcolor(new Color(r,g,b)); gr.drawstring("bsc Students are very Good",10,100); 19. Write an interactive program to wish the user at different hours of the day. import java.util.*; class Prog19 System.out.println("Enter your name:"); String name=br.readline(); Calendar t=calendar.getinstance(); t.settimezone(timezone.gettimezone("ist")); int hourtime=t.get(calendar.hour_of_day); System.out.println("Time=" + hourtime); if(hourtime<12) System.out.println("Good Morning, " + name); else if(hourtime>=12 && hourtime<16) System.out.println("Good Afternoon " + name); else if(hourtime>=16 && hourtime<21) System.out.println("Good Evening " + name); else System.out.println("Good Night " + name); 20. Simulate the library information system i.e. maintain the list of books and borrower's details. class Library

15 public static void main(string args[]) throws Exception int i=0,n,borrow; String con=""; int a[]=new int[10]; String name[]=new String[10]; String s[]="c Programming","Java","DBMS","Web Technologies"; 15 do System.out.println("Select Books from the list:\n"); System.out.println(" 1.C Programming"); System.out.println(" 2.Java"); System.out.println(" 3.DBMS"); System.out.println(" 4.Web Technologies"); System.out.println("\nSelect the book number:"); n=integer.parseint(br.readline()); if(n<1 n>4) System.out.println("Invalid"); break; a[i]=n; System.out.println("Enter your name:"); name[i]=br.readline(); i++; System.out.println("Continue?(y,n):"); con=br.readline(); while(con.equals("y")); borrow=i; if(borrow>0) System.out.println("****************************************"); System.out.println("\nName \t Book borrowed"); System.out.println("****************************************"); for(i=0;i<n;i++) if(name[i]!=null) System.out.println(name[i]+"\t"+s[a[i]]); System.out.println("****************************************");