Abstract class

1. class that is declared using “abstract” keyword; 
2. may or may not include abstract methods ( has no body)and concrete methods (methods with body) ;
3. we can  not allowed to create object of Abstract class,
4. An abstract class has no use until unless it is extended by some other class ,logic behind structuring inheritance property for project[animal-dog,cow].
5. it provides partial abstraction only,100% abstraction - interface.

See --

Interface , 

abstraction VS interface 

Access Modifiers 2 – Static,Abstract,Final

Static- Variables are calling Class variables. These members belong to the class not to the object,means values of these variables are not part of the object state.creating its while initiating class, not instance .Final- 

Abstract - 

Final - variable is a constant; its value cannot be changed after its initialization.

Access Modifiers – Public, Private, Protected & Default

Public - This is the least restrictive,accessible to entire project;

Default - If no access modifier is specified in the declaration, accessible only within package,not accessible in other packages or sub packages;

Protected - Accessible to all classes in the package and to all sub-classes of its class in any package where this class is visible.

Private -This is the most restrictive accessibility modifiers. These members are accessible only with in the same class.

JEE : Login Form HTML - JS - MySQL

=======MYSQL=======
--Login---
C:\Program Files (x86)\MySQL\MySQL Server 5.6>mysql -u root -p
Enter password: ****     //root

mysql> CREATE DATABASE db;
Query OK, 1 row affected (0.00 sec)

mysql> USE db;
Database changed
mysql> CREATE TABLE user_table(username varchar(25),password varchar(25),secureno int);


//check table ----------
--Login---
C:\Program Files (x86)\MySQL\MySQL Server 5.6>mysql -u root -p
Enter password: ****     //root


//pointing db
mysql> USE db;

desc user_table;
///---Result-------
 +----------+-------------+------+-----+---------+-------+
| Field    | Type        | Null | Key | Default | Extra |
+----------+-------------+------+-----+---------+-------+
| username | varchar(25) | YES  |     | NULL    |       |
| password | varchar(25) | YES  |     | NULL    |       |
| secureno | int(11)     | YES  |     | NULL    |       |
+----------+-------------+------+-----+---------+-------+
3 rows in set (0.01 sec)

//to know prot no


mysql> show variables;   //3306

//---------Imp--------- not used this resource to new forum site ,collected from

http://bigknol.com/open-blog/2013/07/eclipse-jee-development-tutorial/

,add mysql env variable screen shot also--------------------imp-------//

• Prerequisite for JSP/MySQL Application with Eclipse JEE Kepler.
  • Download and Install MySQL Server 5.5 on your Windows Machine
  • Install Tomcat Server6.0( 32-bit windows zip)
  • Download MySQL Connector/j for connecting JSP to MySQL Server.(mysql-connector-java-5.1.25.zip, Platform Independent (Architecture Independent))
  • Download Eclipse IDE for Java EE Developers 32 bit windows And unzip it

  JSP MySQL Eclipse JEE Development Kepler Tutorial

  Creating a database and Table using MySQL : Open cmd prompt (Windows+R and Type ‘cmd’) or use MySQL 5.5 Command line client. Change directory to MySQL Server 5.5 installed Path. (In this example path looks like : C:\mysql\MySQL Server 5.5\bin>)
  Create a new user in MYSQL Sever
  1 2	mysql –u <user-name> -p enter password: *****

  You can use root if you have super user privilege, or create a new user in MySQL, to create a new user:
  1 2 3

  CREATE USER ‘nikisurf’@’localhost’ IDENTIFIED BY ‘password’; GRANT ALL PRIVILEGES ON *.* TO ‘nikisurf’@’localhost’;

   Login as a new user
  mysql –u nikisurf -p
  Create a new Database db and Selecting Database
  1 2	CREATE DATABASE db; USE db;

   Create a new Table in MySQL called ‘info’
  1 2 3 4

  CREATE TABLE info(username varchar(25),password varchar(25), firstname varchar(25),lastname varchar(25), address varchar(25),pincode int, phonenumber int);

  
  
  
  
  
  
  
  
  
  Open Eclipse
  Click eclipse.exe file from unzipped folder and set a workspace(location of projects)
  Create a new Dynamic Web Project
  File => New => Dynamic Web Project, and give Project name as ‘Info’ click Next
  again Next Finish.
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  Connect MySQL to JSP with Eclipse Kepler
  Add Library : MySQL Connector/j
  Unzip mysql-connector-java-5.1 and select mysql-connector-java-5.1.23-bin.jar file and drag and drop into the Project explorer of the Eclipse(info => WebContent => WEB-INF => lib).
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  Start Coding
  Right Click on Info from Project Explorer => New => HTML File (Give Name as index.html)
  index.html
  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

  <!DOCTYPE html> <html> <head> <meta charset="ISO-8859-1"> <title>Insert title here</title> </head> <body> <h1>Add Info</h1> <form action="add.jsp" method="post"> User name : <input type="text" name="username" /><br /> password : <input type="password" name="password" /><br /> First name :<input type="text" name="firstname" /><br /> Last name :<input type="text" name="lastname" /><br /> address :<textarea cols="10" rows="15" name="address"> </textarea><br /> Pin code <input type="text" name="pincode" /><br /> <br /> phone number <input type="text" name="phonenumber" /><br /> <input type="submit" value="Add Details" /><br /> </form> </body> </html>

  Create a new JSP file : Right Click on Info from Project Explorer => New => JSP File (Give Name as add.jsp) Insert the codes between body tag of the document
  add.jsp
  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58

  <%@page import="java.sql.*" %> <%@page import="java.io.*" %> <%@page import="javax.sql.*" %> <%@page import="java.sql.Connection" %> <% String username=request.getParameter("username"); String password=request.getParameter("password"); String firstname=request.getParameter("firstname"); String lastname=request.getParameter("lastname"); String address=request.getParameter("address"); String pincode=request.getParameter("pincode"); String phonenumber=request.getParameter("phonenumber"); Class.forName("com.mysql.jdbc.Driver"); Connection con=DriverManager.getConnection ("jdbc:mysql://localhost:3306/db","nikisurf","nikisurf"); Statement st=con.createStatement(); String sql="insert into info (username,password,firstname,lastname,address,pincode,phonenumber) values('"+username+"','"+password+"','"+firstname+"','"+lastname+"', '"+address+"','"+pincode+"','"+phonenumber+"')"; int flag=st.executeUpdate(sql); if(flag==1) { out.println("Added!"); } else { out.println("Failed"); } response.sendRedirect("show.html"); %>

   Create delete.html
  1 2 3 4 5 6 7 8 9 10 11 12 13

  <!DOCTYPE html> <html> <head> <meta charset="ISO-8859-1"> <title>Insert title here</title> </head> <body> <form action="delete.jsp" method="post" > Enter First name to delete:<input type="text" name="username" /> <input type="submit" value="delete" /> </form> </body> </html>

  delete.jsp
  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

  <%@page import="java.sql.*" %> <%@page import="java.io.*" %> <%@page import="javax.sql.*" %> <%@page import="java.sql.Connection" %> <% String username=request.getParameter("username"); Class.forName("com.mysql.jdbc.Driver"); Connection con=DriverManager.getConnection ("jdbc:mysql://localhost:3306/db", "nikisurf","nikisurf"); Statement st=con.createStatement(); try { st.executeUpdate("DELETE FROM info WHERE username = '"+username+"'"); boolean flag=true; if(flag==true) { out.println("Deleted"); } else { out.println("Not possible : error!"); } } catch(Exception e) { out.println("Exception"); } %>

  show.html
  1 2 3 4

  <form action="show.jsp" method="post"> Enter User name <input type="text" name="username" /> <input type="submit" value="show details" />

  show.jsp
  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75

  <%@page import="java.sql.*" %> <%@page import="javax.sql.*" %> <%@page import="java.sql.Connection" %> <% String username=request.getParameter("username"); Class.forName("com.mysql.jdbc.Driver"); Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/db","nikisurf","nikisurf"); Statement st=con.createStatement(); String query="select * from info where username='"+username+"'"; ResultSet rs=st.executeQuery(query); %> <% while(rs.next()) { %> <table border="2" bordercolor="#2494b7"> <tr> <th>UserName</th> <th>Password</th> <th>First Name</th> <th>Last Name</th> <th>Address</th> <th>Pin code</th> <th>Mobile Phone</th> </tr> <tr> <td><%=rs.getString(1)%></td> <td><%=rs.getString(2)%></td> <td><%=rs.getString(3)%></td> <td><%=rs.getString(4)%></td> <td><%=rs.getString(5)%></td> <td><%=rs.getString(6)%></td> <td><%=rs.getString(7)%></td> </tr> </table> <% } %>

  Run JEE Eclipse Info Project
  To run tomcat server with Eclipse : Right Click on Info from Project Explorer =>Run as => Run on Server