1(a).
METHOD OVERLOADING
Source code:
class shape
{
int ht,wd,side;
long rad;
shape(int a)
{
side=a;
}
shape(int h,int w)
{
ht=h;
wd=w;
}
shape(long r)
{
rad=r;
}
void show_sd ()
{
System.out.println("Side="+side);
}
void show_ht()
{
System.out.println("Height="+ht+" Width="+wd);
}
void show_rd()
{
System.out.println("Radius="+rad);
}
void geo(int a)
{
int area=a*a;
System.out.println("Area of Square="+area);
}
void geo(int l, int b)
{
int area=l*b;
System.out.println("Area of Rectangle="+area);
}
void geo(double r)
{
double area=3.14*r*r;
System.out.println("Area of Circle="+area);
}
}
class overload
{
public static void main(String ar[])
{
shape s1=new shape(10);
shape s2=new shape(20,30);
shape s3=new shape(40l);
s1.show_sd();
s2.show_ht();
s3.show_rd();
s1.geo(5);
s2.geo(4,5);
s3.geo(1.75);
}
}
Output:
D:\java\bin>javac overload.java
D:\java\bin>java overload
Side=10
Height=20 Width=30
Radius=40
Area of Square=25
Area of Rectangle=20
Area of Circle=9.61625
1(b).
METHOD OVERRIDING
Aim:
To implement overriding concept on methods by using inheritance.
Source code:
class circle
{
double r;
circle()
{
r=10;
}
void getarea()
{
double a=3.14*r*r;
System.out.println("Area of a circle:"+a);
}
}
class cylinder extends circle
{
double r,h;
cylinder(double rad,double height)
{
r=rad;
h=height;
}
void getarea()
{
double a=3.14*r*r*h;
System.out.println("Area of a cylinder:"+a);
}
}
class findarea
{
public static void main(String args[])
{
circle c=new circle();
cylinder l=new cylinder(5,10);
circle ref;
ref = c;
ref.getarea();
ref = l;
ref.getarea();
}
}
Output:
D:\java\bin>javac findarea.java
D:\java\bin>java findarea
Area of a circle:314.0
Area of a cylinder:785.0
2(a). PACKAGE IMPLEMENTATION
Source code:
package student;
import java.io.*;
public class s1
{
String name;
int ro,m1,m2,m3,tot;
double avg;
public s1(String n,int r)
{
name=n;
ro=r;
}
public double marks(int a,int b,int c)
{
m1=a;
m2=b;
m3=c;
tot=m1+m2+m3;
avg=(m1+m2+m3)/3;
System.out.println("Name:"+name);
System.out.println("Roll No:"+ro);
System.out.println("Total Marks:"+tot);
System.out.println("Average="+avg);
return avg;
}
}
import student.*;
import java.io.*;
class s2
{
public static void main(String args[])
{
s1 ob=new s1("hari",101);
ob.marks(78,80,86);
}
}
Output:
D:\java\bin\student>..\javac s1.java
D:\java\bin\student>cd..
D:\java\bin>javac s2.java
D:\java\bin>java s2
Name:hari
Roll No:101
Total Marks:244
Average=81.0
2(b). INTERFACE IMPLEMENTATION
Source code:
interface shape2d
{
void getarea(int l,int b);
void getvolume(int l,int b);
}
interface shape3d
{
void getarea(int l,int b,int h);
void getvolume(int i,int b,int h);
}
class example implements shape2d,shape3d
{
public void getarea(int l,int b,int h)
{
System.out.println("Area of Cuboid:"+(l*b*h));
}
public void getvolume(int l,int b,int h)
{
System.out.println("Volume of Cuboid:"+(2*(l+b+h)));
}
public void getarea(int l,int b)
{
System.out.println("Area of Rectangle:"+(l*b));
}
public void getvolume(int l,int b)
{
System.out.println("Volume of Rectangle:"+(2*(l+b)));
}
}
class result
{
public static void main(String ar[])
{
example ob=new example();
ob.getarea(10,5);
ob.getvolume(10,5);
ob.getarea(2,4,5);
ob.getvolume(2,4,5);
}
}
Output:
D:\java\bin>javac result.java
D:\java\bin>java result
Area of Rectangle: 50
Volume of Rectangle: 30
Area of Cuboid: 40
Volume of Cuboid: 22
3. EXCEPTION HANDLING
Source code:
import java.lang.Exception;
import java.io.*;
class myex extends Exception
{
myex(String message)
{
super(message);
}
}
class vehicle
{
public static void main(String args[])throws IOException
{
int age=0;
DataInputStream in=new DataInputStream(System.in);
try
{
System.out.println("Enter the age");
age=Integer.parseInt(in.readLine());
if((age>18) && (age<50))
System.out.println("Licence Allowed...");
else
throw new myex("Not Permitted!!!");
}
catch(NumberFormatException e)
{
System.out.println("Invalid Input!!!");
}
catch(myex e)
{
System.out.println("Age limit Exception!!!");
System.out.println(e.getMessage());
}
}
}
Output:
D:\java\bin>javac vehicle.java
Note: vehicle.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
D:\java\bin>java vehicle
Enter the age
20
Licence Allowed...
D:\java\bin>java vehicle
Enter the age
12
Age limit Exception!!!
Not Permitted!!!
4. INTERTHREAD COMMUNICATION
Source code:
import java.io.*;
class Q
{
int n;
boolean valueSet=false;
synchronized int get()
{
if(!valueSet)
try
{
wait();
}
catch(InterruptedException e)
{
System.out.println("InterruptedEcxeption caught");
}
System.out.println("Got : "+n);
valueSet=false;
notify();
return n;
}
synchronized void put(int n)
{
if(valueSet)
try
{
wait();
}
catch(InterruptedException e) {
System.out.println("InterruptedException caught");
}
this.n=n;
valueSet=true;
System.out.println("Put :"+n);
notify();
}
}
class producer implements Runnable
{
Q q;
producer(Q q) {
this.q=q;
new Thread(this,"Producer").start();
}
public void run()
{
int i=0;
while(true) {
q.put(i++);
}
}
}
class Consumer implements Runnable {
Q q;
Consumer(Q q)
{
this.q=q;
new Thread(this,"Consumer").start();
}
public void run()
{
while(true)
{
q.get();
}
}
}
class PCFixed
{
public static void main(String args[]) {
Q q=new Q();
new producer(q);
new Consumer(q);
System.out.println("Press Control - c to Stop . ");
}
}
Output:
D:\java\bin>javac PCFixed.java
D:\java bin>java PCFixed
Put : 1
Got : 1
Put : 2
Got : 2
Put : 3
Got : 3
Put : 4
Got : 4
5. FILE APPLICATION
Source code:
import java.io.*;
import java.lang.*;
class fileinput
{
void fread()throws IOException
{
int size;
InputStream f=new FileInputStream("file1.txt");
size=f.available();
System.out.println("Number of bytes available for read:"+size);
for(int i=0;i<10;i++)
System.out.println((char)f.read());
byte[] b=new byte[size];
f.read(b);
int s=b.length;
System.out.println("Reading from the buffer...\n");
System.out.println(new String(b,0,s));
f.close();
}
}
class fileoutput
{
void fwrite()throws FileNotFoundException,IOException,SecurityException
{
String source="this is good morning";
byte buf[]=source.getBytes();
OutputStream fo=new FileOutputStream("file1.txt");
fo.write(buf);
fo.close();
}
}
class fileinput1
{
public static void main(String ar[])throws IOException
{
fileoutput fo=new fileoutput();
fo.fwrite();
fileinput fi=new fileinput();
fi.fread();
}
}
OUTPUT:
D:\java\bin>javac fileinput1.java
D:\java\bin\>java fileinput1
Number of bytes available for read:20
t
h
i
s
i
s
g
o
Reading from the buffer...
od morning
REMOTE METHOD INVOCATION
/*interface:inte.java*/
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface inte extends Remote
{
int add(int a,int b)throws RemoteException;
int sub(int a,int b)throws RemoteException;
int mul(int a,int b)throws RemoteException;
int div(int a,int b)throws RemoteException;
}
/*Server Program:cserver.java*/
import java.io.*;
import java.rmi.*;
import java.rmi.server.*;
import java.rmi.registry.*;
public class cserver extends UnicastRemoteObject implements inte
{
public cserver()throws RemoteException
{
super();
}
public int add(int a,int b)throws RemoteException
{
return a+b;
}
public int sub(int a,int b)throws RemoteException
{
return a-b;
}
public int mul(int a,int b)throws RemoteException
{
return a*b;
}
public int div(int a,int b)throws RemoteException
{
return a/b;
}
public static void main(String args[])
{
try
{
inte c1=new cserver();
String I="CI";
Naming.rebind(I,c1);
System.out.println("Server bound and started");
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
/*Client Program:cclient.java*/
import java.rmi.*;
public class cclient
{
public static void main(String args[])
{
try
{
String I="CI";
inte c=(inte)Naming.lookup(I);
System.out.println("Ready to continue");
int i=c.add(2,3);
int j=c.sub(3,2);
int k=c.mul(2,4);
int l=c.div(4,2);
System.out.println(i);
System.out.println(j);
System.out.println(k);
System.out.println(l);
}
catch(Exception e)
{}
}
}
Output:
D:\java\bin>javac inte.java
D:\java\bin>javac cserver.java
D:\java\bin>javac cclient.java
D:\java\bin>rmic cserver
D:\java\bin>start rmiregistry
D:\java\bin>java cserver
Server bound and started.
/*In new DOS window:*/
D:\java\bin\java cclient
Ready to continue
5
1
8
2
SERVLETS
Source code:
// Employee.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
<style type="text/css">
<!-.style1 {font-size: 24px}
-->
</style>
</head>
<body>
<table width="350" height="196" border="0" align="center" cellpadding="0" cellspacing="0">
<form id="form1" name="form1" method="post" action="">
<tr>
<td width="350"><div align="center" class="style1">Employee Informations </div></td>
</tr>
<tr>
<td><div align="center"><strong><a href="Employee.html">Click here to Store Employee
Informatiopn</a> </strong></div></td>
</tr>
<tr>
<td><div align="center"><strong><a href="http://localhost:8080/Mca/View">Click here to
View Employee Information </a></strong></div></td>
</tr>
</form>
</table>
</body>
</html>
//
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
<style type="text/css">
<!-.style1 {font-size: 24px}
-->
</style>
</head>
<body>
<table width="275" height="196" border="0" align="center" cellpadding="0" cellspacing="0">
<form id="form1" name="form1" method="post" action="http://localhost:8080/Mca/Reg">
<tr>
<td colspan="2"><div align="center" class="style1">Employee Informations </div></td>
</tr>
<tr>
<td width="100"><strong>Name </strong></td>
<td width="175">
<input name="Ename" type="text" id="Ename" /></td>
</tr>
<tr>
<td><strong>Address </strong></td>
<td>
<textarea name="Eadd" id="Eadd"></textarea></td>
</tr>
<tr>
<td><strong>Phone</strong></td>
<td>
<input name="Ephn" type="text" id="Ephn" /> </td>
</tr>
<tr>
<td colspan="2">
<div align="center">
<input type="submit" name="Submit2" value="Submit" />
<input type="reset" name="Reset" value="Reset" />
</div> </td>
</tr>
</form>
</table>
</body>
</html>
// ServletReg.java
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.sql.*;
import java.sql.*;
public class ServletReg extends HttpServlet
{
Connection dbcon;
public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException,
IOException
{
// Establishing the connection with the database
//----------------------------------------------try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
dbcon=DriverManager.getConnection("jdbc:odbc:Mca","Subramanian","balaji");
System.out.println("Connection established");
}
catch(ClassNotFoundException e)
{
System.out.println("Database driver not found");
System.out.println(e.toString());
}
catch (Exception e)
{
System.out.println(e.toString());
} // end catch
// This program records the details in the Registration table
//--------------------------------------------------------res.setContentType("text/html");
PrintWriter out=res.getWriter();
String Ename=req.getParameter("Ename");
String Eadd=req.getParameter("Eadd");
String Ephn=req.getParameter("Ephn");
// inserting the values in the registration table
//------------------------------------------int rows=0;
try
{
PreparedStatement s = dbcon.prepareStatement("INSERT INTO
Employee(Ename,Eadd,Ephn)VALUES(?,?,?)");
s.setString(1,Ename);
s.setString(2,Eadd);
s.setString(3,Ephn);
rows=s.executeUpdate();
}
catch (Exception e)
{
out.println(e.toString());
}
if (rows==0)
{
System.out.println("Error inserting data in the registration table");
}
else
{
System.out.println("The values have been inserted in the table
successfully");
}
}
}
<!DOCTYPE
html
PUBLIC
"-//W3C//DTD
XHTML
1.0
Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
</head>
<body>
<div align="center">
<p>Employee Id
<input type="text" name="textfield" />
</p>
<form id="form1" name="form1" method="post" action="http://localhost:8080/Mca/View">
<input type="submit" name="Submit" value="Submit" />
</form>
<p> </p>
</div>
</body>
</html>
// ServletRet.java
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.sql.*;
import java.sql.*;
public class ServletRet extends HttpServlet
{
Connection dbcon;
ServletContext ctx;
public void init(ServletConfig cfg)
{
ctx=cfg.getServletContext();
}
public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException,
IOException
{
// Establishing the connection with the database
//----------------------------------------------try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
dbcon = DriverManager.getConnection("jdbc:odbc:Mca", "Scott", "tiger");
System.out.println("Connection established");
}
catch(ClassNotFoundException e)
{
System.out.println("Database driver not found");
System.out.println(e.toString());
}
catch (Exception e)
{
System.out.println(e.toString());
} // end catch
//--------------------------------------------------------res.setContentType("text/html");
PrintWriter out=res.getWriter();
String batchno = req.getParameter("batchno");
String lesson = req.getParameter("lesson");
ctx.setAttribute("lesson",lesson);
ctx.setAttribute("batchno",batchno);
// Picking up the Questions from the table for the user
//---------------------------------------------------------------String Ename =new String(" ");
String Eadd = new String(" ");
String Ephn = new String(" ");
try
{
PreparedStatement s=dbcon.prepareStatement("select Ename,Eadd,Ephn
from Employee where Eid =(?)");
s.setString(1,id);
ResultSet r=s.executeQuery();
out.println("<html>");
out.println("
out.println("<meta
<head>");
http-equiv='Content-Type'
charset=iso-8859-1' />");
out.println("<title>Untitled Document</title>");
out.println("<style type='text/css'>");
out.println("<!--");
out.println(".style1 {font-size: 24px}");
out.println("-->");
out.println("</style>");
out.println("</head>");
out.println("<body>");
content='text/html;
out.println("<table width='275' height='196' border='0' align='center'
cellpadding='0' cellspacing='0'>");
out.println("<tr>");
out.println("<td colspan='2'><div align='center' class='style1'>Employee
Informations </div></td>");
out.println("</tr>");
while (r.next())
{
Ename = r.getString(1);
Eadd = r.getString(2);
Ephn = r.getString(3);
out.println("<tr>");
out.println("<td width='100'><strong>Name </strong></td>");
out.println("<td width='175'>"+Ename+"</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td><strong>Address </strong></td>");
out.println("<td>"+Eadd+"</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td><strong>Phone</strong></td>");
out.println("<td>"+Ephn+"</td>");
out.println("</tr>");
}
out.println("</table>");
out.println("</body>");
out.println("</html>");
}
catch(Exception e)
{
System.out.println(e.toString());
}
try
{
dbcon.close();
}
catch(Exception e)
{
System.out.println(e.toString());
}
}
}
Output:
D:\java\bin\javac ServletRet.java
D:\java\bin\javac ServletReg.java
