java basic

             JAVA PROGRAM

Object oriented and cant write procedural programs
Functions are called methods
Unit of a program is the class from which objects are created
Automatic garbage collection
Singleinheritance only
Each class contains data and methods which are used to manipulate the data
Programs are small and portable
Multithreaded which allows several operations to be executed concurrently
A rich set of classes and methods are available in java class libraries
Platform Independent
Case sensitive

java program development

* Edit –use any editor
* Compile –use command ‘javac’ if your program compiles correctly, will create a file with extension .class
* Execute –use the command ‘java’

java language keyword

Keywords are special reserved words in java that you cannot use as identifiers for classes, methods or variables. They have meaning to the compiler, it uses them to understand what your source code is trying to do.

first Java program

class FirstPro {
public static void main(String args[])
{
System.out.println("Hello World!“);
}
}

java source files

 All java source files must end with the extension ‘.java’
Generally contain at most one top level public class definition
If a public class is present, the class name should match the file name

top level elevents appears in a file

If these are present then they must appear in the following order.
Package declarations
Import statements
Class definitions

identifiers

An identifier is a word used by a programmer to name a variable, method class or label.
Keywords may not be used as an identifier
Must begin with a letter, a dollar sign($) or an underscore( _ ).
Subsequent character may be letters, digits, _ or $.
Cannot include white spaces.

declering

ms access short question answer

MS ACCESS 

1) What is  Database  Management System  (DBMS)?

 *computer  Software  to  manage, maintain  database  as  well  as  view  update and  retrieve  data  is  called  database management  system.

 2)What do you mean by  data processing? 

*The  term  data  processing  embraces  the technique  of  sorting,  relating,  interpreting and  computing  items  of  data  in  order  to provide  meaningful  and  useful  information. 

3) List  some database applications.

* Some  of  the  popular  database  management systems  are:  Oracle,  Sybase,  MS  Access,  MS SQL  Server,  Paradox,  DB/2,  Dbase,  FoxPro, MySql 

4) What is  MS-Access?

* MS-Access  is  a  RDBMS  (Relational  Database Management  System)  application  developed by  Microsoft  Inc.  that  runs  on  Windows operating  System.   

5) What is  Database?

* A  database  is  an  organization  of  data  related to  a  particular  subject  or  purpose  so  that  the data  can  be  retrieved or  processed. 

6) What is  the extension of  Access database file? 

*The  extension  of  MS-Access  data  file  is  MDB. 

7) What is relational database? 

*A database with tables related to each other on a common field to facilitate the data retrieval from multiple tables is known as relational database. 

8) What is a key field?

* A common field on which two tables are linked is known as key field. 

9) What is primary key?

* A primary key is a rule which ensures that unique data is entered for the field and the field is not left blank. This is the field that would indentify a record uniquely in table

10)  What do you mean by foreign key? 

*The common field in child table that maintains relation with master table is foreign key. 

11) What are the elements of a database?  

*The major six elements of a database are   Tables, Queries, Form, Reports, Macros, Modules

12) What is a table? 

*A table is a collection of data about a specific topic such as products, students or suppliers. A table organizes data into columns (fields) and rows (records or tuples)

13) What is  a field? 

*A  field  in  a  database  is  a  piece  of  information  about  a  subject. Each  field  is  arranged  as  a  column in  table.

14) What is  a record?

* A  record  is  complete  information  about  a  subject.  A  record  is  a  collection  of  fields  and presented  as  a  row  in  a  table  of  database. 

15) What is  a query?

* A  query  is  a  question  about  data  in  database.  It  results  a  set  of  data  from  database  that  can  be used  as  a  source  of  records  for  reports  and  forms. 

16) What is  a form? 

*Entering  and  viewing  data  directly  on  the database  table  is  not  always  convenient.  So,  a form  is  created  to  facilitate  easy  entering  data and  created  that  retrieve  records  from  a  single table  or  from  multiple  tables.

17) What is  a  report? A  report  is  an  object  in  MS-Access  that  is  used to  view  and  print  data.  Though  a  Report  is similar  to  a  form;  its  specialty  lies  in  special features  like  help  to  summarize  data. 

18) What are  the differences between a form and a  report? *Forms  are  primarily  used  to  edit  overview  data whereas  reports  are  used  primarily  to  print  or view  data. In  a  form  your  usually navigate  from  one  record to  another,  whereas  in  reports  summarized data  are  possible  to  present. 

19) What is  a macro? 

*A  macro  is  an  object  in  MS-Access  that  is  used to  execute  one  or  more  database  commands automatically.  Macros  are  useful  in  tasks  such as  printing  month-end  reports,  adding  new record  to  a  table,  printing  letters  to  customers periodically. 

20) What is  a module?

* A  module  object  in  Access  is  a  program  written using  VBA  (Visual  Basic  for  Application)  to automate  and  customize  database  function. 

link tag

<!DOCTYPE html>
<html>

<head>
  <title>Link in HTML</title>
</head>

<body>

  <a href="http://www.mafasict.blogspot.com">mafasict</a>


</body>

</html>

check box

<!DOCTYPE html>
<html>

<head>
  <title>Check Box</title>
</head>

<body>


  <input type="checkbox" name="subject">Maths

  <input type="checkbox" name="subject">Ict

</body>

</html>

radio button

<!DOCTYPE html>
<html>

<head>
  <title>Radio Button </title>
</head>

<body>


    <input type="radio" name="gndr">Male

   
 
    <input type="radio" name="gndr">FeMale
 

</body>

</html>

input button tag

<!DOCTYPE html>
<html>

<head>
  <title>Input Button</title>
</head>

<body>

  <input type="button" value="Click Me">

</body>

</html>

text area

<!DOCTYPE html>
<html>

<head>
  <title>Text Area</title>
</head>

<body>

  <textarea cols="5" rows="5">Colombo,srilanka</textarea>

</body>

</html>

password tag

<!DOCTYPE html>
<html>

<head>
  <title>password</title>
</head>

<body>

  Username:
  <input type="text">
  <br> Password :
  <input type="password">

</body>

</html>

text box

<!DOCTYPE html>
<html>

<head>
  <title>TextBox</title>
</head>

<body>

  <input type="text" value="12345" size="5" maxlength="3">

</body>

</html>

center tag

<!DOCTYPE html>
<html>

<head>
  <title>Center tag</title>
</head>

<body>

  <center>This is the text display in center</center>

</body>

</html>

pre tag

<!DOCTYPE html>
<html>

<head>
  <title>Pre Tag</title>
</head>

<body>

  <pre>
H
 A
  V
   E
    A
     N
      I
      C
     E
    D
   A
 Y
  </pre>
  <br>
  <!--No Pre Tag-->
H
 A
  V
   E
    A
     N
      I
      C
     E
    D
   A
 Y

</body>

</html>