Program to find Fibonacci using JSP

http://www.opentechzone.com/java-swing-jsp-servlet/program-to-find-fibonacci-using-jsp/

To delete a record from a database table using java swing application

Packages used:

1.      javax.swing.*              : Provides a set of "lightweight" (all-Java language) components that, to the maximum degree possible, work the same on all platforms.

2.      java.awt.*                    : Contains all of the classes for creating user interfaces and for painting graphics and images.

3.      java.awt.event.*                      : Provides interfaces and classes for dealing with      different types of events fired by AWT components

4.      java.sql.*                                 : Provides the API for accessing and processing data stored in a data source (usually a relational database) using the Java programming language.

Classes used:

·         JFrame             : An extended version of java.awt.Frame that adds support for the JFC/Swing component architecture.

·         Container        : A generic Abstract Window Toolkit(AWT) container object is a component that can contain other AWT components. Components added to a container are tracked in a list

·         JLabel  : A display area for a short text string or an image, or both

·         JButton           : An implementation of a "push" button.

·         JTextField : JTextField is a lightweight component that allows the editing of a single line of text.

·         Connection                  : A connection (session) with a specific database. SQL statements are executed and results are returned within the context of a connection. A Connection object's database is able to provide information describing its tables, its supported SQL grammar, its stored procedures, the capabilities of this connection, and so on.

·         Statement                    : The object used for executing a static SQL statement and returning the results it produces.

·         ResultSet                     : table of data representing a database result set, which is usually generated by executing a statement that queries the database.

Logical flow of the program:

·         The swing program extends JFrame class and implements ActionListener.

·         Container object containing the JButtons,JTextFields are defined.

·         Connection is established between the database and the swing program with the data source.

·         When the “delete ” button is pressed the corresponding record is deleted through the object of Statement class.

·         When “next” or “previous” buttons are pressed corresponding navigation is implemented.

·         Id text field in the frame is not editable.

Important notes:

·         The swing program must import the package “javax.swing.*”.

·         To stop the execution of the program on closing frame,use the method setDefaultCloseOperation(EXIT_ON_CLOSE).

·         While writing the code for JDBC-ODBC bridge enclose it in try-catch blocks.

·         For backward mavigation, object of Statement should be initialized like this

stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE )

To update a database table using java swing application.

To update a database table using java swing application.
Packages used:

1.      javax.swing.*              : Provides a set of "lightweight" (all-Java language) components that, to the maximum degree possible, work the same on all platforms.

2.      java.awt.*                    : Contains all of the classes for creating user interfaces and for painting graphics and images.

3.      java.awt.event.*                      : Provides interfaces and classes for dealing with      different types of events fired by AWT components

4.      java.sql.*                                 : Provides the API for accessing and processing data stored in a data source (usually a relational database) using the Java programming language.

Classes used:

·         JFrame             : An extended version of java.awt.Frame that adds support for the JFC/Swing component architecture.

·         Container        : A generic Abstract Window Toolkit(AWT) container object is a component that can contain other AWT components. Components added to a container are tracked in a list

·         JLabel  : A display area for a short text string or an image, or both

·         JButton           : An implementation of a "push" button.

·         JTextField : JTextField is a lightweight component that allows the editing of a single line of text.

·         Connection                  : A connection (session) with a specific database. SQL statements are executed and results are returned within the context of a connection. A Connection object's database is able to provide information describing its tables, its supported SQL grammar, its stored procedures, the capabilities of this connection, and so on.

·         Statement                    : The object used for executing a static SQL statement and returning the results it produces.

·         ResultSet                     : table of data representing a database result set, which is usually generated by executing a statement that queries the database.

Logical flow of the program:

·         The swing program extends JFrame class and implements ActionListener.

·         Container object containing the JButtons,JTextFields are defined.

·         Connection is established between the database and the swing program with the data source.

·         When the “update ” button is pressed the corresponding record is updated through the object of Statement class.

·         When “next” or “previous” buttons are pressed corresponding navigation is implemented.

·         Id text field in the frame is not editable.

Important notes:

·         The swing program must import the package “javax.swing.*”.

·         To stop the execution of the program on closing frame,use the method setDefaultCloseOperation(EXIT_ON_CLOSE).

·         While writing the code for JDBC-ODBC bridge enclose it in try-catch blocks.

·         For backward mavigation, object of Statement should be initialized like this

stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE )

A JAVA program to find Fibanocci/cuberoot/square root/palindrome/factorial/odd-even/prime

A JAVA program to find Fibanocci/cuberoot/square root/palindrome/factorial/odd-even/prime.
Packages used:

1.      java.io.*                       : Provides for system input and output through data streams, serialization and the file system.

2.      javax.swing.*  : Provides a set of "lightweight" (all-Java language) components that, to the maximum degree possible, work the same on all platforms.

3.      java.awt.*                    : Contains all of the classes for creating user interfaces and for painting graphics and images.

4.      java.awt.event.*          : Provides interfaces and classes for dealing with different types of events fired by AWT components

5.      java.math.*      : Provides classes for performing arbitrary-precision integer arithmetic (BigInteger) and arbitrary-precision decimal arithmetic

Classes used:

·         JFrame : Provides classes for performing arbitrary-precision integer arithmetic (BigInteger) and arbitrary-precision decimal arithmetic

·         Container        : A generic Abstract Window Toolkit(AWT) container object is a component that can contain other AWT components. Components added to a container are tracked in a list

·         JLabel  : A display area for a short text string or an image, or both

·         JButton           : An implementation of a "push" button.

·         JTextField : JTextField is a lightweight component that allows the editing of a single line of text.

Logical flow of the program:

·         A class inheriting JFrame and implementing ActionListener is created.

·         Container holds components like JLabel,JButton,JTextField.

·         According to the button clicked corresponding action is performed.

·         Result of the corresponding operation is displayed on the text field.

Important notes:

·         In all swing program the package that should be imported is “javax.swing.*”.

·         If in the program JApplet is inherited then the “init()” method is used to initialize the applet.

·         If in the program JFrame is inherited then the inheriting class’s constructor initializes the swing application.

1.If super() method is called ,it should be the first line inside the constructor.

2.Frame’s visibility and size must be set.

Servlet Program in java

Write a servlet that reads the name of the servlet class and its initialisation parameters from a server file and then displays these parameters on the screen.
Packages used:

1.      java.io.*           : Provides for system input and output through data streams, serialization and the file system.

2.      java.util.*        : Provides for system input and output through data streams, serialization and the file system.

3.      javax.servlet.*              : contains a number of classes and interfaces that describe and define the contr acts between a servlet class and the runtime environment provided for an insta nce of such a class by a conforming servlet container.

4.      javax.servlet.http.*      : package contains a number of classes and interfaces that describe and define the contracts between a servlet class running under the HTTP protocol and the runtime environment provided for an instance of such a class by a conforming servlet container.

Classes used:

·         HttpServlet              : simplifies writing HTTP servlets,provides an framework for handling the HTTP protocol. Because it is an abstract class, servlet writers must subclass it and override at least one method.

·         HttpServletRequest : gets data from the client to the servlet for use in the HttpServlet.service method

·         HttpServletResponse  : This interface allows a servlet's service method to manipulate HTTP-protocol specified header information and return data to its client.

·         PrintWriter               : Print formatted representations of objects to a text-output stream. This class implements all of the print methods found in PrintStream

·         HttpUtils                  : collection of static utility methods useful to HTTP servlets.

Logical flow of the program:

·         A public class that inherits HttpServlet is created.

·         Initialisation parameters from a server file is obtained with the help of methods defined in HttpUtils class,object of HttpServletRequest class is used to obtain different parameters of a server file.

Important notes:

·         The servlet program must import the package “javax.servlet.*”.

·         If  the servlet program is accessing database it should import the package “java.sql.*”.

·         The servlet class should be declared “public”.

·         The class should extend “HttpServlet” class.

·         The class should throw ServletException,IOException to avoid compilation error.

·         If  the servlet class is extending “GenericServlet” then the method used is “service()”.

·         If  the servlet class is extending “HttpServlet”, it should import the package “javax.servlet.http.*”.Also the method used here is either “doGet()”  or  “doPost()”.

Animation Program in java

Create an animation with a single line, which changes its position in a clock-wise direction. This line should produce an effect of a spinning line. In the same example give option for clock-wise or anti-clock-wise spinning. Also provide start and stop buttons to start and stop the animation. Demonstrate the animation on the screen.

Packages used:

1.      javax.swing.*     : Provides a set of "lightweight" (all-Java language) components that, to the maximum degree possible, work the same on all platforms.

2.      java.awt.*          : Contains all of the classes for creating user interfaces and for painting graphics and images.

3.      java.awt.event.*   : Provides interfaces and classes for dealing with different types of events fired by AWT components.

4.      java.lang.*            : Provides classes that are fundamental to the design of the Java programming language.

Classes used:

• Graphics : Provides classes that are fundamental to the design of the Java programming language.

·         JButton   : An implementation of a "push" button.

·         Thread    : A thread is a thread of execution in a program. The Java Virtual Machine allows an application to have multiple threads of execution running concurrently.

Logical flow of the program:

·         A class that extends JApplet and implements Runnable contains a getContentPane container JPanel which holds two buttons.

·         Since this class implements Runnable interface it defines two methods:-init() and run().

·          init() method initializes the thread.

·         Two methods are defined for clockwise spinning line and an anticlockwise spinning line.

·         Each method defines a variable “theta”.By randomly obtaining the values of x & y using Math.random() method,lines are drawn clock-wise as well as anticlockwise.

·          repaint() method is called whenever the JApplet is refreshed.

Important notes :

·         In all swing program the package that should be imported is “javax.swing.*”.

·         If in the program JApplet is inherited then the “init()” method is used to initialize the applet.

·         If in the program JFrame is inherited then the inheriting class’s constructor initializes the swing application.

1.      If super() method is called ,it should be the first line inside the constructor.

2.      Frame’s visibility and size must be set.

Swing Form in Java

Create a form using JFrame having 2 fields namely Name and Remarks. Also create a button called Insert. This button will insert these data from the form in a text file and later on read the same data and print it. If more number of records are entered it should be appended to the same file. Assume that the text file is already present. Also notify the Exceptions thrown by the above program and give appropriate messages there.

Packages used:

1.      javax.swing.*              : Provides a set of "lightweight" (all-Java language) components that, to the maximum degree possible, work the same on all platforms.

2.      java.awt.*                    : Contains all of the classes for creating user interfaces and for painting graphics and images.

3.      java.awt.event.*          : Provides interfaces and classes for dealing with different types of events fired by AWT components.

4.      javax.swing.event.*    : Provides for events fired by Swing components. It contains event classes and corresponding event listener interfaces for events fired by Swing components in addition to those events in the java.awt.event package.

5.      java.io.*                       : Provides for system input and output through data streams, serialization and the file system.

Classes used:

·         Conatainer              : component that can contain other AWT components. Components added to a container are tracked in a list

·         JLabel                           : Object which can display text,image or both.

·         JTextField                   : A lightweight component that allows the editing of a single line of text

·         JButton                       : An implementation of a "push" button

·         FileOutpustStream      : A file output stream is an output stream for writing data to a File or to a FileDescriptor. Whether or not a file is available or may be created depends upon the underlying platform.

Logical flow of the program:

·         The frame holds two textfields to accept the name and remarks from the user.

·         The text file to which data is to inserted is opened with the object of the class FileOutputStream.

·         To append the data to the text file the object of FileOutputStream must be initialized with the following constructor.

“public FileOutputStream(String name,boolean append)”.

If the second parameter which accepts a Boolean value is “true”,then the data is added to end of the text file rather than at the beginning.

·         Object of DataOutputStream is defined to write the data obtained to the text file.

Important notes:

·         In all swing program the package that should be imported is “javax.swing.*”.

·         “javax.swing.event.*” package is imported to perform events in swing program.

·         If in the program JFrame is inherited then the inheriting class’s constructor initializes the swing application.

1.If super() method is called ,it should be the first line inside the constructor.

2.Frame’s visibility and size must be set.

·         If the objects of components are declared before the constructor,only initialization of those objects are done inside the constructor.if the objects are declared twice that would generate exception.

MDI Form in SWING

(Creating MDI Form in SWING)Design a class, which extends JFrame and has three objects of three classes whose name are ColorPanel, CitiesPanel, and FlavourPanel. All the three classes (ColorPanel: Names of colors inside it, CitiesPanel: Names of cities inside it, and FlavourPanel- Names of Icecream flavours) extend JInternalFrame and have a method, which makes the Panel visible.

The main JFrame has an object of JDesktopPane and this object holds the three panels, which are displayed on the click of the menu bar item.

Packages used:

1.      javax.swing.*     : Provides a set of "lightweight" (all-Java language) components that, to the maximum degree possible, work the same on all platforms.

2.      java.awt.*            : Contains all of the classes for creating user interfaces and for painting graphics and images.

3.      java.awt.event.*    : Provides interfaces and classes for dealing with different types of events fired by AWT components.

Classes used:

·         JMenuBar   : An implementation of a menu bar. JMenu objects are added to the menu bar to construct a menu

·         JMenu         : An implementation of a menu -- a popup window containing JMenuItems that is displayed when the user selects an item on the JMenuBar.

·         JMenuItem   : An implementation of an item in a menu. A menu item is essentially a button sitting in a list.

·         JDesktopPane : A container used to create a multiple-document interface or a virtual desktop.

Logical flow of the program:

·         A menu is created with an object of JMenuBar which holds a JMenu object.

·         This JMenu object contains three JMenuItem objects,each attached to ActionListener.Clicking on those menuitems will lead to an JInternalFrame object on the JDesktopPane.

·         Object of JDesktopPane class is created which holds objects of JInternalFrame class.

·         Each JInternalFrame object contains a JPanel container holding different components.

Important Notes :

·         In all swing program the package that should be imported is “javax.swing.*”.

·         If in the program JApplet is inherited then the “init()” method is used to initialize the applet.

·         If in the program JFrame is inherited then the inheriting class’s constructor initializes the swing application.

1.      If super() method is called ,it should be the first line inside the constructor.

2.      Frame’s visibility and size must be set.

Free Hand In JAVA

Objective:

Define a class that enables the drawing of freehand lines on a screen through mouse clicking and dragging. Use anonymous inner classes to implement event listeners. The drawing should be cleared when a key is pressed and the line colour should be selectable. Define a test class to demonstrate the program.

Packages used:

1. java.awt.*;   : Contains all of the classes for creating user interfaces and for painting graphics and images.
2. java.awt.event.*  : Provides interfaces and classes for dealing with different types of events fired by AWT components.

Classes used:

• Frame     : A Frame is a top-level window with a title and a border.The size of the frame includes any area designated for the border.

·         MenuBar  : The MenuBar class encapsulates the platform's concept of a menu bar bound to a frame. In order to associate the menu bar with a Frame object, call the frame's setMenuBar method.

·         Menu : A Menu object is a pull-down menu component that is deployed from a menu bar. Each item in a menu must belong to the MenuItem class. It can be an instance of MenuItem, a submenu (an instance of Menu), or a check box (an instance of CheckboxMenuItem).

·         MenuItem : All items in a menu must belong to the class MenuItem, or one of its subclasses. The default MenuItem object embodies a simple labeled menu item.

·         Graphics    : The Graphics class is the abstract base class for all graphics contexts that allow an application to draw onto components that are realized on various devices, as well as onto off-screen images.

·         Color          : The Color class is used to encapsulate colors in the default sRGB color space or colors in arbitrary color spaces identified by a ColorSpace.

Logical flow of the program:

·         File Menu contains clear and quit options

·         Colour menu has blue, red and green options to change stroke colour

·         When the mouse if first pressed, mousePressed event is called which sets the x1 and y1 to the current mouse coords

·         When the mouse is dragged in paint area, mouseDragged event is called which sets x2 and y2 as the coordinates of the mouse pointer and passes it to a function called draw which in turn draws a line between x1,y1 and x2,y2 . Then it sets x1 and y1 as current mouse co-ords. So, the next drag event draws line between these cords and the newly moved co-ords of the mouse. This goes on on every drag event.

·         When the mouse is finally released, mouseReleased event is called which sets x2 and y2 as the coordinates of the mouse pointer and passes it to a function called draw which in turn draws a line between x1,y1 and x2,y2 . Then it sets x1 and y1 as current mouse co-ords

Important notes :

·         Import java.awt.event.* even if you have imported java.awt.*

·         If in the program Frame is inherited then the inheriting class’s constructor initializes the application.

1.      If super() method is called ,it should be the first line inside the constructor.

2.      Frame’s visibility and size must be set.