Pros

1. IDE Features [ Syntax Highlighting , Debugging , Preview ...]
2. Full Java , J2EE Development Support.
3. Various Flavors are available [Eclipse Classic , Eclipse for Java  , Eclipse for J2EE ... ]
4. Plug-in Development Support
5. Perl , Python , C , C++ , Ruby on Rails language support
6. Plug-in s are more [ You can find from Eclipse Plug-in Site ]
7. Execution Speed is good ,Memory Consumption is less, Eclipse will also work in 512 MB RAM ,
8. Debugging support for all languages.
9. Developer friendly

Cons

1. Single Bundle or package is not available for all features.
2. Lacks for Java Swing Designing
3. No Internal Server for running Client / Server Script like apache or tomcat or glassfish

Netbeans IDE

Pros

1. All IDE Features
2. Java, C , C++ , PHP , Ruby , groovy languages support
3. Bundled with single package for all features
4. Various flavors are available [Netbeans Java , J2EE , C ..]
5. Debugging is good
6. WYSIWYG design for Java Swing Application
7. Full Java Script and CSS support
8. Tomcat and Glassfish serves are in built with Netbeans IDE
9. Developer friendly
10. Option for uploading project into open source community [ using Kenai]

Cons

1. Occupying More Memory (Min 512 MB)
2. Execution Speed is somewhat low comparing to eclipse [But its  based on processor and memory )
3. Plug-ins are less

Final Words

In my working experience with IDEs , If you want to develop Java Swing and J2EE Related Applications, you can move for Netbeans , or always choose Eclipse to code.

I have prepared Java basics syntax sheet which would be very useful for beginners and students . The following topics has been covered in style sheet

1. Java Comments
2. Data Types
3. Variables
4. Constants
5. Operators
6. Mathematical Functions
7. Reading Input
8. String Class
9. Conditional Statements
10. Branching and Looping
11. Classes and Objects
12. Inner Class
13. Interface

The Remaining topics will be released in next version .

Click Here To Download the Syntax Sheet

You can modify , use , distribute to anyone . No restrictions apply to this Syntax Sheet.

Object Serialization

Object Serialization is the process of converting object into stream of bytes which would be transferred via network. In other end the stream of bytes would be converted into original object , this process is called object de-serialization. The stream of bytes will be stored into a file in local disk after serialization.Now lets take small review about classes and methods used for Serialization and De-serialization process.

Package Name : java.io

Classes :

1. ObjectOutputStream
2. ObjectInputStream
3. FileOutputStream
4. FileInputStream

Methods :

1. Object readObject()
2. void writeObject(Object obj)

Example Program

Now lets create one Employee Object with some fields then we can apply the serialization concept.

1. Employee.java

package com.rmi.serial;
 
/*
 * Author :Anthoniraj.A
 * Date  : 30/06/09
 * Description : Program For Object Creation
 */
import java.io.Serializable;
 
public class Employee implements Serializable
{
    String name;
    String designation;
    double salary;
    int exp;
}

2.Employee Serialization

package com.rmi.serial;
/*
 * Author :Anthoniraj.A
 * Date  : 30/06/09
 * Description : Program For Object Serialization
 */
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
 
public class EmpSerializable
{
  Employee emp = null;;
  ObjectOutputStream oos = null;
 
  private void setValues()
  {
      emp = new Employee();
      emp.name = "Antony";
      emp.designation="AssistantProfessor";
      emp.salary =32000;
      emp.exp = 3;
  }
  private void serializeValues()
  {
        try
        {
          oos = new ObjectOutputStream(new FileOutputStream(new File("sample.ser")));
          oos.writeObject(emp);
          System.out.println("An Employee Object is serialized into sample.ser file");
        }
        catch (IOException ex)
        {
             ex.printStackTrace();
        }
        finally
        {
            try
            {
               oos.flush();
               oos.close();
            }
            catch (IOException ex)
            {
                Logger.getLogger(EmpSerializable.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
  }
  public static void main(String a[])
  {
       EmpSerializable es = new EmpSerializable();
       es.setValues();
       es.serializeValues();
  }
 
}
 
OutPut
An Employee Object is serialized into sample.ser file

3.Employee DeSerialization

package com.rmi.serial;
/*
 * Author :Anthoniraj.A
 * Date  : 30/06/09
 * Description : Program For Object Deserialization
 */
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
 
public class EmpDeserializable
{
  ObjectInputStream ois = null;
  private void getValues()
  {
        try
        {
           ois = new ObjectInputStream(new FileInputStream(new File("sample.ser")));
 
           Employee em = (Employee) ois.readObject();
           System.out.println("Employee Name :" + em.name);
           System.out.println("Employee Designation :" + em.designation);
           System.out.println("Employee Salary :"+em.salary);
           System.out.println("Employee Experience :" + em.exp);
 
        }
        catch (Exception ex)
        {
           ex.printStackTrace();
        }
        finally
        {
            try
            {
                ois.close();
            }
            catch (IOException ex)
            {
               ex.printStackTrace();
            }
        }
     }
  public static void main(String a[])
  {
      new EmpDeserializable().getValues();
  }
}
 
output
Employee Name :Antony
Employee Designation :AssistantProfessor
Employee Salary :32000.0
Employee Experience :3

Primitive Types – Wrapper Class
byte – Byte
short – Short
char – Character
boolean – Boolean
int – Integer
long – Long
float – Float
double – Double

package org.vit.java.collections;
public class WrapperTest {
 
public static void main(String[] args) {
double d1 = 1.1234;
Double d = new Double(d1);
System.out.println(d.intValue());
System.out.println(d.doubleValue());
System.out.println(d.floatValue());
System.out.println(d.isNaN());
System.out.println(d.byteValue());
System.out.println(d.compareTo(0.0));
System.out.println(Double.MIN_VALUE);
System.out.println(Double.MAX_VALUE);
 
}
 
}

Output :
1
1.1234
1.1234
false
1
1
4.9E-324
1.7976931348623157E308

2.Type Casting

package org.vit.java.collections;
 
import javax.swing.JOptionPane;
public class TypeCasting
{
 
public static void main(String[] args)
{
int x =10;
String str = String.valueOf(x);
float f = Float.parseFloat(str);
JOptionPane.showMessageDialog(null,x);
}
 
}

Output:
The result is 10.0

3. Vector Example

package org.vit.java.collections;
 
import java.util.Vector;
 
public class VectorTest {
 
public static void main(String[] args) {
Vector v = new Vector();
System.out.println("The Default Capacity is "+v.capacity());
v.add("antony");
v.add("raj");
v.add("10");
v.add("23.4");
v.add("kamal");
v.add("234");
v.add("214.40");
v.add("java");
v.add("2.0");
v.add("2.4");
v.add("11");
v.add("end");
System.out.println("The Vector is growing its size doubled s"+v.capacity());
System.out.println("The first element of vector is "+v.firstElement());
System.out.println("The last element of vector is "+v.lastElement());
System.out.println("The 10th element of vector is "+v.get(9));
System.out.println("The size of the vector is "+v.size());
v.set(0, "start");
System.out.println("The first element of vector is "+v.firstElement());
v.remove(9);
System.out.println("The Vector Values are");
for(int i=0;i<v.size();i++)>
{
System.out.print(v.get(i)+" ");
}
v.clear();
}
}

Output :
The Default Capacity is 10
The Vector is growing its size doubled s20
The first element of vector is antony
The last element of vector is end
The 10th element of vector is 2.4
The size of the vector is 12
The first element of vector is start
The Vector Values are
start raj 10 23.4 kamal 234 214.40 java 2.0 11 end

1. Finding Address

package com.java.net;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class FindingAddress
{

public static void main(String[] args) throws UnknownHostException
{
System.out.println(InetAddress.getLocalHost());
System.out.println(InetAddress.getByName(“127.0.0.1″));

}
}

Output :

VITSCS0197/127.0.1.1
/127.0.0.1

2.URL Class
package com.java.net;
import java.net.*;

public class UrlSample
{

public static void main(String[] args) throws MalformedURLException
{
URL u =new URL(“http://www.google.com”);
System.out.println(“Protocol: “+ u.getProtocol());
System.out.println(“Port: ” + u.getPort());
System.out.println(“Default Port: “+ u.getDefaultPort());
System.out.println(“Host: ” + u.getHost());
System.out.println(“File: ” + u.getFile());
System.out.println(“User: ” + u.getUserInfo());
System.out.println(“Path: ” + u.getPath());

}

}

Output

Protocol: http
Port: -1
Default Port: 80
Host: www.google.com
File:
User: null
Path:

package com.java.myapplet;
/*
* Class Name :AppletSample.java
* Date :Mar 21, 2007
* Author :Antony
*/
import java.awt.*;
import java.applet.*;

public class AppletSample extends Applet
{
public void paint(Graphics g)
{
g.setColor(Color.GREEN);
g.drawString(“Welcome to VIT”, 50,50);
}
}

2. Audio Player

package com.java.myapplet;

/**
* Program:AudioPlay.java
* @author Antony
* Date:Jan 5, 2007
* Time:5:32:00 AM
*/
import java.applet.*;
import java.awt.*;
import java.net.URL;

public class AudioPlay extends Applet
{
String filename;
URL codebase;
AudioClip song;

public void init()
{
filename =”sample3.wav”;
codebase = getCodeBase();
song =getAudioClip(codebase,filename);
song.play();

}
public void paint(Graphics g)
{
g.setFont(new Font(“Verdana”,Font.BOLD,20));
g.setColor(Color.GREEN);
g.drawString(“Playing the Illayaraja Music…”,50,50);

}
}

3. Digital Clock

package com.java.myapplet;

/**
* Program:DigitalClock.java
* @author Antony
* Date:Jan 16, 2007
* Time:9:00:07 PM
*/
import java.awt.Graphics;
import java.awt.Font;
import java.util.Date;

public class DigitalClock extends java.applet.Applet implements Runnable
{

Font theFont = new Font(“TimesRoman”, Font.BOLD, 24);

Date theDate;

Thread runner;

public void start()
{
if (runner == null)
{
runner = new Thread(this);
runner.start();
}
}

public void stop()
{
if (runner != null)
{
runner.stop();
runner = null;
}
}

public void run()
{
while (true)
{
theDate = new Date();
repaint();
try
{
Thread.sleep(1000);
}
catch (InterruptedException e)
{
}
}
}

public void paint(Graphics g)
{
g.setFont(theFont);
g.drawString(theDate.toString(), 10, 50);
}
}

4. String Animation

package com.java.myapplet;

import java.applet.Applet;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;

/**
* Program:StringAnimation.java
* @author Antony
* Date:Jan 19, 2007
* Time:4:55:34 PM
*/
public class StringAnimation extends Applet implements Runnable
{
String name;
Thread t;
Font f;
int x,y;
public void init()
{
setSize(300,300);
setBackground(Color.BLACK);
f =new Font(“verdana”,Font.ITALIC,24);
name =”VIT UNIVERSITY”;
x=50;
y=10;

t = new Thread(this);
t.start();
}

public void run()
{
while(true)
{
y++;
if(y>500)
y=10;
repaint();
try
{
Thread.sleep(10);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
}

}
public void paint(Graphics g)
{
g.setColor(Color.GREEN);
g.setFont(f);
g.drawString(name, x, y);

}

}

5. Border layout

package org.vit.java.labcycle2;

import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Label;
import java.awt.Panel;
import java.awt.TextField;

/**
* Program:BorderLayoutDemo.java
* @author Antony
* Date:Jan 19, 2007
* Time:8:53:27 PM
*/

public class BorderLayoutDemo extends Applet
{
Button b1;
Button b2;
Button b3;
Button b4;
Button b5;
Panel p;
Label l;
TextField t;

public void init()
{
setSize(300,300);
setLayout(new BorderLayout());
b1 =new Button(“North”);
add(b1,BorderLayout.NORTH);
b2=new Button(“South”);
add(b2,BorderLayout.SOUTH);
b3=new Button(“West”);
add(b3,BorderLayout.WEST);
b4=new Button(“East”);
add(b4,BorderLayout.EAST);

p=new Panel();
p.setLayout(new FlowLayout());
l= new Label(“Sample Label”);
p.add(l);
t= new TextField();
t.setColumns(10);
p.add(t);
b5 =new Button(“Submit”);
p.add(b5);
add(p,BorderLayout.CENTER);
}
}

6. Flow Layout Demo
package org.vit.java.labcycle2;

import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

/**
* Program:FlowLayoutDemo.java
* @author Antony
* Date:Jan 19, 2007
* Time:9:23:39 PM
*/

public class FlowLayoutDemo extends Frame
{
Button b1;
Button b2;
Button b3;
Button b4;
public FlowLayoutDemo()
{
setSize(400,400);
setLayout(new FlowLayout());
b1 =new Button(“One”);
b2 =new Button(“Two”);
b3 =new Button(“Three”);
b4 =new Button(“Four”);
add(b1);
add(b2);
add(b3);
add(b4);

}
public static void main(String[] args)
{
FlowLayoutDemo f = new FlowLayoutDemo();
f.setVisible(true);
f.setTitle(“FlowLayoutExample”);
f.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}
);

}}

package org.vit.java.multithreading;

public class SampleThread extends Thread
{

public void run(){
for(int i=0;i<10;i++)
{
System.out.println(Thread.currentThread().toString());
}
}
public static void main(String[] args)
{
SampleThread s =new SampleThread();
s.run();
}

}

Output
Thread[main,5,main]
Thread[main,5,main]
Thread[main,5,main]
Thread[main,5,main]
Thread[main,5,main]
Thread[main,5,main]
Thread[main,5,main]
Thread[main,5,main]
Thread[main,5,main]
Thread[main,5,main]

2. Creating Simple Thread Using Runnable Interface
package org.vit.java.multithreading;

class Simple implements Runnable
{

public void run() {
first();

}
public void first()
{
second();
}
public void second()
{
System.out.println(“Child Thread”);
}
}
public class SimpleMethod {
public static void main(String[] args)
{
Runnable r = new Simple();
Thread t = new Thread(r);
t.start();
System.out.println(“Main Thread”);

}

Output 1:
Main Thread
Child Thread

Output 2:
Child Thread
Main Thread

Output 3:
Child Thread
Main Thread

3.Starting Multiple Threads
package org.vit.java.multithreading;
public class ThreadStart implements Runnable
{

public void run()
{
for (int i=0;i<5;i++)
{
String name = Thread.currentThread().getName();
System.out.println(name +” is running”);
}

}
public static void main(String[] args)
{
Runnable r =new ThreadStart();
Thread t1 = new Thread(r);
Thread t2 = new Thread(r);
t1.setName(“First Thread”);
t2.setName(“Second Thread”);
t1.start();
t2.start();
}
}

Output 1:
First Thread is running
First Thread is running
First Thread is running
First Thread is running
First Thread is running
Second Thread is running
Second Thread is running
Second Thread is running
Second Thread is running
Second Thread is running

Output 2
Second Thread is running
Second Thread is running
Second Thread is running
Second Thread is running
Second Thread is running
First Thread is running
First Thread is running
First Thread is running
First Thread is running
First Thread is running

4. Thread Sleep Method

package org.vit.java.multithreading;

public class ThreadSleep
{
public void run()
{
first();
}
public void first()
{
try
{
Thread.sleep(2000);
}
catch (InterruptedException e)
{
e.printStackTrace();
}

second();

}
public void second()
{
System.out.println(“Child Thread”);
}

public static void main(String[] args)
{
Runnable r= new ThreadTest();
Thread t =new Thread(r);
//t.setPriority(t.MIN_PRIORITY);

t.start();
System.out.println(“Main Thread”);

}

}

Output
Main Thread
Child Thread

5. Example

package org.vit.java.multithreading;

class Fibonacci implements Runnable
{

public void run()
{
long a=1;
long b=1;
long c;
for(int k =1;k<=50 ;k++)
{
if(k==1)
System.out.println(“Fibo :” +a);
else if(k==2)
System.out.println(“Fibo :” +b);
else
{
c=a+b;
System.out.println(“Fibo :” +c);
a=b;
b=c;
}
if(k==25)
{
try
{
Thread.sleep(10);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
}

}
}
}
class Prime implements Runnable
{

public void run()
{
int count=0;
for(int i=1;i<=500 && count<25;i++)
{
if(i==1)
{
System.out.println(“Prime :”+i);
count++;
}
else if(i==2)
{
System.out.println(“Prime :” +i);
count++;
}
else
{
boolean flag =false;
for(int j=2;j
{
if(i%j!=0)
{
flag =true;
}
else
{
flag =false;
break;
}

}
if(flag ==true)
{
System.out.println(“Prime :” +i);
count++;
}
}

}
}

}

public class ComputeTest
{

public static void main(String[] args)
{

Prime p = new Prime();
Thread t1 = new Thread(p);
Fibonacci f = new Fibonacci();
Thread t2 = new Thread(f);

t1.setPriority(5);
t2.setPriority(7);

t1.start();
t2.start();

}
}

package com.java.mysql;
import java.sql.*;
public class MysqlConnect
 {
   public static void main (String[] args)
   {
     Connection conn = null;
     try
     {
         String userName = "root";
         String password = "123456";
         String url = "jdbc:mysql://localhost/Check";
         Class.forName ("com.mysql.jdbc.Driver").newInstance ();
         conn = DriverManager.getConnection (url, userName, password);
         System.out.println ("Database connection established");
     }
   catch (Exception e)
    {
        System.err.println ("Cannot connect to database server");
    }
   finally
   {
       if (conn != null)
        {
            try
              {
                 conn.close ();
                 System.out.println ("Database connection terminated");
              }
            catch (Exception e) { /* ignore close errors */ }
         }
    }
  }
}

Output:
Database connection established
Database connection terminated

MySQL Create and Insert

package com.java.mysql;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

public class MysqlCreate
{
public static void main (String[] args)
{
Connection conn = null;

try
{
String userName = “root”;
String password = “123456″;
String url = “jdbc:mysql://localhost/Check”;
Class.forName (“com.mysql.jdbc.Driver”).newInstance ();
conn = DriverManager.getConnection (url, userName, password);
System.out.println (“Database connection established”);
Statement s = conn.createStatement ();
int count;
s.executeUpdate (“DROP TABLE IF EXISTS student”);
s.executeUpdate (
“CREATE TABLE student (”
+ “id INT UNSIGNED NOT NULL AUTO_INCREMENT,”
+ “PRIMARY KEY (id),”
+ “name CHAR(40), branch CHAR(40))”);
count = s.executeUpdate (
“INSERT INTO student (name, branch)”
+ ” VALUES”
+ “(‘Amar’, ‘IT’),”
+ “(‘Amit’, ‘CSE’),”
+ “(‘Antony’, ‘MECH’),”
+ “(‘Anbu’, ‘ECE’)”);
s.close ();
System.out.println (count + ” rows were inserted”);

}
catch (Exception e)
{
System.err.println (“Cannot connect to database server”);
}
finally
{
if (conn != null)
{
try
{
conn.close ();
System.out.println (“Database connection terminated”);
}
catch (Exception e) { /* ignore close errors */ }
}
}
}
}

Output
Database connection established
4 rows were inserted
Database connection terminated

MySQL Select

package com.java.mysql;
import java.sql.*;

public class MysqlSelect
{
public static void main (String[] args)
{
Connection conn = null;

try
{
String userName = “root”;
String password = “123456″;
String url = “jdbc:mysql://localhost/Check”;
Class.forName (“com.mysql.jdbc.Driver”).newInstance ();
conn = DriverManager.getConnection (url, userName, password);
System.out.println (“Database connection established”);
Statement s = conn.createStatement ();
s.executeQuery (“SELECT id, name, branch FROM student”);
ResultSet rs = s.getResultSet ();
int count = 0;
while (rs.next ())
{
int idVal = rs.getInt (“id”);
String nameVal = rs.getString (“name”);
String catVal = rs.getString (“branch”);
System.out.println (
“id = ” + idVal
+ “, name = ” + nameVal
+ “, category = ” + catVal);
++count;
}
rs.close ();
s.close ();
System.out.println (count + ” rows were retrieved”);

}
catch (Exception e)
{
System.err.println (“Cannot connect to database server”);
}
finally
{
if (conn != null)
{
try
{
conn.close ();
System.out.println (“Database connection terminated”);
}
catch (Exception e) { /* ignore close errors */ }
}
}
}
}

Output
Database connection established
id = 1, name = Amar, category = IT
id = 2, name = Amit, category = CSE
id = 3, name = Antony, category = MECH
id = 4, name = Anbu, category = ECE
4 rows were retrieved
Database connection terminated

  package com.java.net;
  import java.net.InetAddress;
  import java.net.UnknownHostException;
  public class FindingAddress
   {
      public static void main(String[] args) throws UnknownHostException
      {
          System.out.println(InetAddress.getLocalHost());
          System.out.println(InetAddress.getByName("127.0.0.1"));
      }
 }

Output :

VITSCS0197/127.0.1.1
/127.0.0.1

2.URL Class

  package com.java.net;
  import java.net.*;
  public class UrlSample
   {
      public static void main(String[] args) throws MalformedURLException
        {
            URL u =new URL("http://www.google.com");
            System.out.println("Protocol: "+ u.getProtocol());
            System.out.println("Port: " + u.getPort());
            System.out.println("Default Port: "+ u.getDefaultPort());
            System.out.println("Host: " + u.getHost());
            System.out.println("File: " + u.getFile());
            System.out.println("User: " + u.getUserInfo());
            System.out.println("Path: " + u.getPath());
       }
   }

Output

Protocol: http
Port: -1
Default Port: 80
Host: www.google.com
File:
User: null
Path:

1. try-catch-finally
package org.vit.java.exception;

import java.util.Scanner;

public class Divison
{

public static void main(String[] args) throws OwnException
{
Scanner in = new Scanner(System.in);
System.out.println(“Enter the First Number:”);
int x =in.nextInt();

System.out.println(“Enter the First Number:”);
int y = in.nextInt();
float z = 0;

try
{
z = x / y;
System.out.print(“The Divison value is” +z);

}
catch(ArithmeticException a)
{
System.out.println(a.toString());
}
finally
{
System.out.print(“I am always here”);
}

}

}

package org.vit.java.exception;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;

public class Sample {

public void getFile(String name)
{
try
{
FileInputStream f = new FileInputStream(new File(name));

}
catch (FileNotFoundException e)
{

System.out.print(e.toString());
}
}
public static void main(String[] args)
{
Sample s = new Sample();
s.getFile(“ss.txt”);
}

}

2. Creating User Defined Exception

package org.vit.java.exception;

import java.util.Scanner;

class MyException extends Exception
{
public String toString()
{
return “Number is less than 10″;
}
}

public class MyExceptionTest
{

public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.println(“Enter the First Number:”);
int x =in.nextInt();

System.out.println(“Enter the First Number:”);
int y = in.nextInt();
float z = 0;

try
{
z = x / y;
if(z < 10.0)
{
throw new MyException();
}
}
catch (MyException e)
{
System.out.println(e.toString());
}
catch(ArithmeticException a)
{
System.out.println(a.toString());
}
finally
{
System.out.print(“The Divison value is” +z);
}
}
}

3. Throws Example

package org.vit.java.exception;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;

public class Sample {

public void getFile(String name) throws FileNotFoundException
{

FileInputStream f = new FileInputStream(new File(name));

}
public static void main(String[] args) throws FileNotFoundException
{
Sample s = new Sample();
s.getFile(“ss.txt”);
}

}