Advanced Java Practical File

Q1. Write a program in java to explain the concept of “THREADING”.

Solution: -
Threads can be implemented in two ways –

1. By Extending the THREAD class.
2. By Implementing the RUNNABLE class.

Implementing the “Runnable” class.

CODE –

class NewThread implements Runnable
{
Thread t;
NewThread()
{
t = new Thread(this, "Demo Thread");
System.out.println("Child thread: " + t);
t.start();
}
public void run()
{
try
{
for(int i = 5; i > 0; i--)
{
System.out.println("Child Thread: " + i);
Thread.sleep(500);
}
}
catch (InterruptedException e)
{
System.out.println("Child interrupted.");
}
System.out.println("Exiting child thread.");
}
}

class ThreadDemo
{
public static void main(String args[])
{
new NewThread(); // create
a new thread
try
{
for(int i = 5; i > 0; i--)
{
System.out.println("Main Thread: " + i);
Thread.sleep(1000);
}
}
catch (InterruptedException e)
{
System.out.println("Main thread interrupted.");
}
System.out.println("Main thread exiting.");
}
}

OUTPUT –

Extending the “THREAD” class.

CODE –
class Share extends Thread
{
static String msg[]={"This", "is", "a", "synchronized", "variable"};
Share(String threadname)
{
super(threadname);
}
public void run()
{
display(getName());
}
public void display(String threadN)
{
synchronized(this){
for(int i=0;i<=4;i++)
{
System.out.println(threadN+msg[i]);
}
try
{
this.sleep(1000);
}
catch(Exception e)
{
}
}
}
}
class Sync
{
public static void main(String[] args)
{
Share t1=new Share("Thread One: ");
t1.start();
Share t2=new Share("Thread Two: ");
t2.start();
}
}

OUTPUT –

Q2. Write a program in java to implement Socket Programming.

Solution: -
A Client – Server Chat Program

CODE –

CLIENT.JAVA
import java.net.*;
import java.io.*;

public class Client implements Runnable
{
Socket s;
BufferedReader br;
BufferedWriter bw;
BufferedReader ppp;
String input = null;
{
new Client();
}
public void run()
{
try
{
s.setSoTimeout(1);
}
catch(Exception e)
{
}
while (true)
{
try
{
System.out.println("Server: "+br.readLine());
}
catch (Exception h)
{
}
}
}
public Client()

{
try
{
s = new Socket("127.0.0.1",100);
br = new BufferedReader(new InputStreamReader(s.getInputStream()));
bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
ppp = new BufferedReader(new InputStreamReader(System.in));
Thread th;
th = new Thread(this);
th.start();
bw.write("Hello Server");
bw.newLine();
bw.flush();
while(true)
{
input = ppp.readLine();
bw.write(input);
bw.newLine();
bw.flush();
}
}
catch(Exception e)
{
}
}
}

SERVER.JAVA
import java.net.*;
import java.io.*;

public class ServerApp implements Runnable
{
ServerSocket s;
Socket s1;
BufferedReader br;
BufferedWriter bw;
BufferedReader ppp;
String input = null;
public void run()
{
try
{
s1.setSoTimeout(1);
}
catch(Exception e)
{
}
while (true)
{
try
{
System.out.println("Client: "+br.readLine());
}
catch (Exception h)
{
}
}
}
public static void main(String arg[])
{
new ServerApp();
}
public ServerApp()

{
try
{
s = new ServerSocket(100);
s1=s.accept();
br = new BufferedReader(new InputStreamReader(s1.getInputStream()));
bw = new BufferedWriter(new OutputStreamWriter(s1.getOutputStream()));
ppp = new BufferedReader(new InputStreamReader(System.in));
Thread th;
th = new Thread(this);
th.start();
while(true)
{
input = ppp.readLine();
bw.write(input);
bw.newLine();
bw.flush();
}
}
catch(Exception e)
{
}
}
}

OUTPUT –

Q3. Write a program in java for Sending E-Mails.

Solution: -
import java.util.Date;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.MimeMessage;

public class Gmail
{
public static void main(String ss[])
{
String host = "smtp.gmail.com";
String username = "somgaj";
String password = "qwaszx,.12/3";
try
{
Properties props = new Properties();
props.put("mail.smtps.auth", "true");
props.put("mail.from","somgaj@gmail.com");
Session session = Session.getInstance(props, null);
Transport t = session.getTransport("smtps");
t.connect(host, username, password);
MimeMessage msg = new MimeMessage(session);
msg.setFrom();
msg.setRecipients(Message.RecipientType.TO, "somgaj@gmail.com");
msg.setSubject("Hello Soumya!!");
msg.setSentDate(new Date());
msg.setText("Hi! FROM JAVA....If you recieve this, it is a success....");
t.sendMessage(msg, msg.getAllRecipients());
}
catch(Exception ee)
{
System.out.println(ee.toString());
}
}
}

OUTPUT –

Q4. Write a program in java for Implementing Calculator in an Applet.

Solution: -

CODE –

CAL.JAVA

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

class Cal extends Applet implements ActionListener
{
String msg=" ";
int v1,v2,result;
TextField t1;
Button b[]=new Button[10];
Button add,sub,mul,div,clear,mod,EQ;
char OP;
public void init()
{
Color k=new Color(120,89,90);
setBackground(k);
t1=new TextField(10);
GridLayout gl=new GridLayout(4,5);
setLayout(gl);
for(int i=0;i<10;i++)
{
b[i]=new Button(""+i);
}
ad=new Button("add");
sub=new Button("sub");
mul=new Button("mul");
div=new Button("div");
mod=new Button("mod");
clear=new Button("clear");
EQ=new Button("EQ");
t1.addActionListener(this);
add(t1);
{
add(b[i]);
}
add(ad);
add(sub);
add(mul);
add(div);
add(mod);
add(clear);
add(EQ);
{
b[i].addActionListener(this);
}
ad.addActionListener(this);
sub.addActionListener(this);
mul.addActionListener(this);
div.addActionListener(this);
mod.addActionListener(this);
clear.addActionListener(this);
EQ.addActionListener(this);
}

public void actionPerformed(ActionEvent ae)
{
String str=ae.getActionCommand();
char ch=str.charAt(0);
if ( Character.isDigit(ch))
t1.setText(t1.getText()+str);
else
if(str.equals("ad"))
{
v1=Integer.parseInt(t1.getText());
OP='+';
t1.setText("");
}
else if(str.equals("sub"))
{
OP='-';
t1.setText("");
}
else if(str.equals("mul"))
{
OP='*';
t1.setText("");
}
else if(str.equals("div"))
{
OP='/';
t1.setText("");
}
else if(str.equals("mod"))
{
OP='%';
t1.setText("");
}
if(str.equals("EQ"))
{
if(OP=='+')
result=v1+v2;
else if(OP=='-')
result=v1-v2;
else if(OP=='*')
result=v1*v2;
else if(OP=='/')
result=v1/v2;
else if(OP=='%')
result=v1%v2;
t1.setText(""+result);
}
if(str.equals("clear"))
{
t1.setText("");
}
}
}

CALCULATOR.HTML

<html>

<applet code=Cal.class height=500 width=400>

</applet>

</HTML>

OUTPUT –

Q6. Write a program in java for Implementing RMI.

Solution: -
An applet using RMI implementing a calculator.

CODE –

CLIENT.JAVA

import java.rmi.*;
import java.rmi.registry.*;
import java.awt.*;

class mathClient extends Frame implements ActionListener
{
Button B1=new Button("Sum");
Button B2=new Button("Subtract");
Button B3=new Button("Multiply");
Button B4=new Button("Divide");
Label l1=new Label("Number 1");
Label l2=new Label("Number 2");
Label l3=new Label("Result");
TextField t1=new TextField(20);
public mathClient()
{
super("Calculator");
setLayout(null);
l1.setBounds(20,50,55,25);
add(l1);
l2.setBounds(20,100,55,25);
add(l2);
l3.setBounds(20,150,55,25);
add(l3);
t1.setBounds(150,50,100,25);
add(t1);
t2.setBounds(150,100,100,25);
add(t2);
t3.setBounds(150,150,100,25);
add(t3);
B1.setBounds(20,200,80,25);
add(B1);
B2.setBounds(100,200,80,25);
add(B2);
B3.setBounds(180,200,80,25);
add(B3);
B4.setBounds(260,200,80,25);
add(B4);
B1.addActionListener(this);
addWindowListener(
new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}

);
}
public void actionPerformed(ActionEvent AE)
{
if(AE.getSource()==B1)
{
sum();
}
else if(AE.getSource()==B2)
{
subt();
}
{
mult();
}
{
div();
}
}
public void sum()
{
int i=Integer.parseInt(t1.getText());
int j=Integer.parseInt(t2.getText());
int val;
try
{
String ServerURL="MathServ";
mathInterface MI=(mathInterface)Naming.lookup(ServerURL);
val=MI.add(i,j);
t3.setText(""+val);
}
catch(Exception ex)
{
System.out.println("Exception:"+ex);
}
}
public void subt()
{
int val;
try
{
val=MI.subt(i,j);
t3.setText(""+val);
}
catch(Exception ex)
{
}
}
public void mult()
{
int val;
try
{
val=MI.mult(i,j);

t3.setText(""+val);
}
catch(Exception ex)
{
}
}
public void div()
{
int val;
try
{
val=MI.div(i,j);
t3.setText(""+val);
}
catch(Exception ex)
{
}
}
{
mathClient MC=new mathClient();
MC.setVisible(true);
MC.setSize(600,500);
};
}

SERVER.JAVA

import java.rmi.*;
import java.rmi.Naming.*;
import java.rmi.server.*;
import java.rmi.registry.*;
import java.net.*;
import java.util.*;
interface mathInterface extends Remote
{
public int add(int a,int b) throws RemoteException;
public int subt(int a,int b) throws RemoteException;
public int mult(int a,int b) throws RemoteException;
public int div(int a,int b) throws RemoteException;
}
class mathServer extends UnicastRemoteObject implements mathInterface
{
public mathServer() throws RemoteException
{
System.out.println("Initializing Server");
}
public int add(int a,int b)
{
return(a+b);
}
public int subt(int a,int b)
{
return(a-b);
}
public int mult(int a,int b)
{
return(a*b);
}

public int div(int a,int b)
{
return(a/b);
}
{
try
{
mathServer ms=new mathServer();
java.rmi.Naming.rebind("MathServ",ms);
System.out.println("Server Ready");
}
catch(RemoteException RE)
{
System.out.println("Remote Server Error:"+ RE.getMessage());
System.exit(0);
}
catch(MalformedURLException ME)
{
System.out.println("Invalid URL!!");
}
}
}

OUTPUT –

Q7. Write a program in java for reading a file from a designated URL.

Solution: -
I have used my drop-box account for accessing a file stored in my DROPBOX server.

CODE –

import java.io.BufferedInputStream;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.Reader;

import java.net.URL;

class MainClass {

public static void main(String[] args) throws Exception {

URL u = new URL("https://dl.dropbox.com/u/94684259/Rajat.txt");

InputStream in = u.openStream();

in = new BufferedInputStream(in);

Reader r = new InputStreamReader(in);

int c;

while ((c = r.read()) != -1) {

System.out.print((char) c);

}

}

}

OUTPUT –

Q8. Write a program in java implementing File input output functions.

Solution: -
CODE –

import java.io.*;
public class CopyFile
{
private static void copyfile(String srFile, String dtFile)
{
try
{
File f1 = new File(srFile);
File f2 = new File(dtFile);

InputStream in = new FileInputStream(f1);
OutputStream out = new FileOutputStream(f2);
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) > 0)
{
out.write(buf, 0, len);
}
in.close();
out.close();
System.out.println("File copied.");
}
catch(FileNotFoundException ex)
{
System.out.println(ex.getMessage() + " in the specified directory.");
System.exit(0);
}
catch(IOException e)
{
System.out.println(e.getMessage());
}
}
{
switch(args.length)
{
case 0: System.out.println("File has not mentioned.");
System.exit(0);
case 1: System.out.println("Destination file has not mentioned.");
System.exit(0);
case 2: copyfile(args[0],args[1]);
System.exit(0);
default : System.out.println("Multiple files are not allow.");
System.exit(0);
}
}
}

OUTPUT –

Q9. Write a program in java implementing Java Beans.

Solution: -

Implementing a counter with JSP on a server for counting number of website views.

CODE –

COUNTERBEAN.JAVA
package form;
public class CounterBean implements java.io.Serializable
{
int coun = 0;

public CounterBean()
{
}
public int getCoun()
{
coun++;
return this.coun;
}
public void setCoun(int coun)
{
this.coun = coun;
}
}

COUNTER.JSP

<%@ page language="java" %>

<jsp:useBean id="counter" scope="session" class="form.CounterBean" />

<HTML>

<HEAD><TITLE>Use Bean Counter Example</TITLE>

</HEAD>

<BODY>

<table><tr><td>The current count for the counter bean is: 

<%=counter.getCoun() %></td></tr>

</table

</BODY>

</HTML>

OUTPUT –

Q10. Write a program in java implementing Swings.

Solution: -
CODE –

import java.awt.*;
import javax.swing.*;
import javax.swing.text.html.*;
public class bar
{
final static int interval = 1000;
int i;
JLabel label;
JProgressBar pb;
Timer timer;
JButton button;
public bar()
{
JFrame frame = new JFrame("Progress Bar :: By - Rajat Suneja");
button = new JButton("Start");
button.addActionListener(new ButtonListener());
pb = new JProgressBar(0, 20);
pb.setValue(0);
pb.setStringPainted(true);
label = new JLabel("Rajat Suneja");
JPanel panel = new JPanel();
panel.add(button);
panel.add(pb);
JPanel panel1 = new JPanel();
panel1.setLayout(new BorderLayout());
panel1.add(panel, BorderLayout.NORTH);
panel1.add(label, BorderLayout.CENTER);
panel1.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
frame.setContentPane(panel1);
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
timer = new Timer(interval, new ActionListener()
{
public void actionPerformed(ActionEvent evt)
{
if (i == 20)
{

Toolkit.getDefaultToolkit().beep();
timer.stop();
button.setEnabled(true);
pb.setValue(0);
String str = "<html>" + "" + "" +
"Downloading completed." + "" + "" + "</html>";
label.setText(str);
}
i = i + 1;
pb.setValue(i);
}
});
}

class ButtonListener implements ActionListener
{
public void actionPerformed(ActionEvent ae)
{
button.setEnabled(false);
i = 0;
String str = "<html>" + "" + "" + "Downloading
is in process......." + "" + "" + "</html>";
label.setText(str);
timer.start();
}
}
{
bar spb = new bar();
}
}

OUTPUT -

Advanced Java Practical File

Recommended

Recommended

More Related Content

What's hot

What's hot (20)

Viewers also liked

Viewers also liked (20)

Similar to Advanced Java Practical File

Similar to Advanced Java Practical File (20)

More from Soumya Behera

More from Soumya Behera (9)

Recently uploaded

Recently uploaded (20)

Advanced Java Practical File