Java Program

B.Tech CS
Object Oriented Techniques
Practical File
Sudeep Singh

Syntax Of Classes
♦♦ Simple class ♦♦
<class- keyword> <class- name>
{
<method- access specifier> <type- return/non_return> <method- name>()
{ operations }
}
♦♦ static top most class ♦♦
<static- keyword><class- keyword> <class- name>
{
<method- access specifier> <type- return/non_return> <method- name>()
{ operations }
}
♦♦ main class ♦♦
<class- keyword> <class- name>
{
public static void main (String [ ]s )
{
System.out.println(“Welcome In BHABHA GROUP OF INSTITUTION”) ;
}
}

♦♦1 program to add two number ♦♦
class sum
{
public static void main(String[]s)
{
int a,b,c;
a=Integer.parseInt(s[0]);
b=Integer.parseInt(s[1]);
c=a+b;
System.out.println("sum = "+c);
} }
♦♦2 program to multiply two number ♦♦
class multi
{
{
int a,b,c;
c=a*b;
System.out.print("sum = "+c);
}
}

♦♦3 program to print factorial of any number ♦♦
class factorial
{
{
int a,f=1;
for(int i=a;i>=1;i--)
{ f=f*i; }
System.out.println("Factorial of n = "+f);
} }
♦♦4 program to find number is palindrom or not♦♦
class palindrom
{
{
int a,b,c=0,d;
d=a;
do
{ b=a%10;
c=c*10+b;
a=a/10; }
while(a>0);
if(d==c)
System.out.println("number is palindrom "+d);
else System.out.println("number is not palindrom "+d); } }

♦♦5 program to find out no.is Armstrong or not ♦♦
class armstrong
{
{
int a,b,c=0,d;
{
d=a;
do
{ b=a%10;
c=c+b*b*b;
a=a/10; }
while(a>0);
if(d==c)
System.out.println("number is armstrong "+d);
else System.out.println("number is not armstrong "+d); } } }
♦♦6 program to find out even & odd number ♦♦
class number
{
{
int a,b;
for(int i=a;i<=b;i++)
{ if(i%2==0)
System.out.println("Number is even = "+i);

else System.out.println("Number is odd = "+i); } } }
♦♦7 program to print the table from “x” to “y”♦♦
class table
{
public static void main(String []s)
{
int a,b;
if(a<=b)
{
{
for(int j=1;j<=10;j++)
{
System.out.print(j*i+" ");
}
System.out.println(" ");
}}
else
{
for(int i=b;i<=a;i++)
{
{
System.out.print(j*i+" ");
}
}
}
}
}

♦♦ 8 program to print no. in various format ♦♦
class print
{
{
int a,b;
{
for(int j=a;j<=i;j++)
{
System.out.print(" "+j);
}
} System.out.println(" ");
for(int i=b;i>=a;i--)
{
for(int j=a;j<=i;j++)
{
}
}
{
for(int j=b;j>=i;j--)
{

}
}
{
for(int j=b;j>=i;j--)
{
}
}
{
for(int j=i;j>=a;j--)
{
}
{
for(int j=i;j>=a;j--)
{
} } }

♦♦ 9 program Of Overriding ♦♦
class x
{
public void test(int a,int b )
{
int c= a + b ;
System.out.println("from class x sum ="+c);
}
}
class y extends x
{
public void test(int a,int b )

{
int c= a * b ;
System.out.println("from class y multiplication ="+c);
}
}
class overriding
{
public static void main(String [ ]s)
{
int a,b;
y obj=new y( );
obj.test(a,b);
}
}
♦♦ 10 program Of Overloading ♦♦
class x
{
public void test(int a, int b )
{
int c = a * b ;
System.out.println("multiplication of number = "+c);
} }
class y
{
public void test(int a, int b, int d )

{
int c= a + b + d ;
System.out.println("sum of given number = "+c);
} }
class overloading
{
public static void main (String [ ] s)
{
int a=Integer.parseInt(s[0]);
int b=Integer.parseInt(s[1]);
int d=Integer.parseInt(s[2]);
x obj = new x( );
obj.test(a ,b );
y obj1 = new y( );
obj1.test(a ,b ,d );
} }
♦♦11 Communication of class by creating object♦♦
class A
{
public void show( )
{
System.out.println("welcome from A");
}
}
class B
{
public void show1( )

{
A obj=new A( );
obj.show( );
}
}
class C
{
{
B obj=new B( );
obj.show1( );
}
}
♦♦ 12 Communication of class by inheritance ♦♦
class A
{
public void show( )
{
System.out.println("welcome from A");
} }
class B extends A
{
public void show1( )
{
System.out.println("welcome from B");
} }

class D
{
{
B obj = new B( );
obj.show( );
} }
♦ 13 Area of circle & rectangle using object ♦
class circle
{
public void area_c(int r )
{
int ar;
ar=r*r*22/7;
System.out.println("Area of circle= "+ar);
}
}
class rect
{

public void area_rec(int le, int br )
{
int ar;
ar=le*br;
System.out.println("Area of rectangle= "+ar);
}
}
class area
{
{
int r=Integer.parseInt(s[0]);
int le=Integer.parseInt(s[1]);
int br=Integer.parseInt(s[2]);
circle obj=new circle( );
obj.area_c(r );
rect obj1=new rect( );
obj1.area_rec(le, br );
}
}
♦♦14 use of abstract class ♦♦
abstract class test
{
abstract public void show( );
{ }
}
class help extends test
{
public void show( )
{
System.out.println(" from class help ");
} }

class take extends test
{
public void show( )
{
System.out.println(" from class take ");
} }
class give extends test
{
public void show( )
{
System.out.println(" from class give ");
} }
class abstractdemo
{
{
help obj=new help( );
obj.show( );
take obj1=new take( );
obj1.show( );
give obj2=new give( );
obj2.show( ); } }

♦♦ 15 use of package ♦♦
packagea;
public class a1
{ public void sum(inta, int b)
{ int c= a + b;
System.out.println("sum="+c); } }
packagea;
public class a5
{ public void fact(int a, int b)
{for(inti=a;i<=b;i++)
{ int f=1;
for(intj=i;j>=1;j--)
{ f=f*j; }
System.out.print("Factof "+i);
System.out.println("="+f); } } }
packagea;
public class a4
{ public void table(int a,int b)
{ for(int i=a;i<=b;i++)
{ System.out.print("tableof "+i);
System.out.print("=");
for(intj=1;j<=10;j++)
{ System.out.print(" "+j*i); }
System.out.println(" "); } } }
packagea;
public class a3
{ public void mul(int a, int b)
{ int c= a * b;
System.out.println("mul="+c); } }
packagea;
public class a2
{ public void sub(inta, int b)
{ if(a>b)
{ int c= a - b;
System.out.println("sub ="+c); }
else
{ int c= b - a;
System.out.println("sub ="+c); } } }

import a.*;
class cal
{ public static void main(String []s)
{ int a=Integer.parseInt(s[0]);
int b=Integer.parseInt(s[1]);
a1 obj=new a1();
obj.sum(a,b);
a2 obj1=new a2();
obj1.sub(a,b);
a3 obj3=new a3();
obj3.mul(a,b);
a4 obj4=new a4();
obj4.table(a,b);
a5 obj5=new a5();
obj5.fact(a,b); } }

♦♦ 16 “try” and “catch” block ♦♦
class ab
{
public static void main(String [ ]s)
{
try
{
int i=Integer.parseInt(s[0]);
int j=Integer.parseInt(s[1]);
int k=i/j;
System.out.print("result="+k);
}
catch(Exception e)
{System.out.print(e);}
}
}

♦♦17 Userthread by extending Thread class ♦♦
class abc extends Thread
{
public abc()
{
start();
}
public void run()
{
try
{
for(int i=5;i<=9;i++)
{ System.out.print("table of "+i);
System.out.print("=");
{ System.out.print(" "+j*i); }
sleep(500);
}
}
catch(Exception e)
}
}
class test
{
public static void main (String []s)
{
try
{
abc obj=new abc();
}
catch(Exception e)
} }

♦♦18 multiplethread with join(); ♦♦
class sud extends Thread
{
String name;
public sud(String name)
{
this.name=name;
start();
}
public void run()
{
try
{
for(int i=0;i<5;i++)
{
System.out.println("name =" +" " +name +"=" +i);
sleep(500);
}
}
catch(Exception e)
}
}
class main
{
{
try
{
sud one=new sud("first ");
sud sec=new sud("second");
sud third=new sud("third ");
sec.join();
one.join();
third.join();
for(int i=0;i<5;i++)
{
System.out.println("main = " +i);
}
}
catch(Exception e)
}
}

♦♦19 Take input until char= ’z’ in io-package ♦♦
import java.io.*;
classabc
{
{
char c;
try
{
BufferedReader B=new BufferedReader(new
InputStreamReader(System.in));
do
{
System.out.print("enter until z =");
c=(char)B.read();
}
while(c!= 'z');
}
catch(Exception e)
}
}

♦♦20 Take input until string=’off’ in io package
import java.io.*;
classabc
{
{
String l;
try
{
BufferedReader B=new BufferedReader(new
InputStreamReader(System.in));
do
{
l=B.readLine();
System.out.print("enter until off =");
if(l.equals ("off"))
{break;}
}
while(true);
}
catch(Exception e)
}
}

♦♦21 Open a file in read mode in io-package ♦♦
import java.io.*;
class file
{
{
try
{
FileInputStream B=new FileInputStream("sud.txt");
while (B.read()!=-1)
{
char c=(char)B.read();
System.out.print(c);
}
}
catch(Exception e)
}
}

♦♦22insert value in database ♦♦
importjava.sql.*;
class insert
{
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection
con=DriverManager.getConnection("Jdbc:Odbc:Contact_detail");
PreparedStatementpst=con.prepareStatement("insert into
values('abc' ,+918009000260,'abc@gmail.com')");
pst.close();
con.close();
}
catch(Exception e)
}
}
♦♦23featch value from database ♦♦
importjava.sql.*;
classfeatch
{
public static void main(String []s1)
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection
con=DriverManager.getConnection("Jdbc:Odbc:Contact_detail");
Statement smt=con.createStatement();
ResultSetrs=smt.executeQuery("select * from emp");
while(rs.next())
{
int a=rs.getInt(1);
String s=rs.getString(2);
System.out.print(a +" " +s);
} }
catch(Exception e)
}}

<HTML>
<from method=”get” action=”demo”>Enter the number : -
<input type="text" name="number"/><br>
<input type="submit" name="submit"/><br>
</form></html>
♦♦24Display Welcome with user Servlat♦♦
import java.io.*;
importjavax.servlet.*;
public class demo extends GenericServlet
{
publi void service(ServletRequestreq,ServletResponse res)
throws ServletException, IOexception
{
res.setContent Type("text/HTML");
PrintWriter out=res.getWriter();
for(inti=0;i<10;i++)
{
out.print("Welcome");
} } }
♦25receive data from HTML and cheak even/odd ♦
import java.io.*;
public class demo extends GenericServlet
{
publi void service(ServletRequestreq,ServletResponse res)
throws ServletException, IOexception
{
res.setContent Type("text/HTML");
int a=Interger.ParseInt(req.getParameter("number"));
if(a%2==0)

<html><form method="get" action="first">
Enter Name:-<input type="text" name="name"/><br><br>
Enter Password :- <input type="password" name="password"/><br><br>
<input type="submit" name="submit"/><br>
</form></html>
import java.io.*;
importjavax.servlet.http.*;
public class firstextends GenericServlet
{
public void service(ServletRequestreq,ServletResponseres) throws
ServletException, IoException
{
RequestDispatcherrd=req.getRequestDispatcher("home")
res.setContentType("text/HTML");
String name=(String)req.getParameter("name");
String password=(String)req.getParameter("password");
if (name.equals("sudeep") &&password.equals("abc123"))
rd.forword(req, res)
out.print("Number is even = "+a);
else
out.print("Number is odd = "+a);
}}
♦♦ 26passing values between servlet ♦♦
“login.html”
“first.java”

import java.io.*;
importjavax.servlet.http.*;
public class firstextends GenericServlet
{
publi void service(ServletRequestreq,ServletResponseres) throws
ServletException, IOexception
{
res.setContentType("text/HTML");
String n=(String)req.getAttribute("name");
String p=(String)req.getAttribute("password");
out.print("name="+n +" " +"password="+p));
}
}
“home.java”

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