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JAVA DRAW OVALS
Java Draw Ovals. Summary: In this tutorial "Java Draw Ovals", you learn drawing of drawing ovals in Java graphics. After learning rectangles drawing, let us see the oval. Oval (Latin: Ovum meaning egg) is an elliptical shape rounded at both ends. JAVA TUTORIAL KEY EVENT, KEYBOARD INPUT AND KEYLISTENER Java Tutorial Key Event, Keyboard Input and KeyListener. Keyboard generate KeyEvent and handled by KeyListener overriding 3 abstract methods. Example given with Screenshot where key typed is displayed in TextField. Every component either software (like button) or hardware (like keyboard or mouse) when interacted by the user generates anevent.
MOUSE RIGHT CLICK EXAMPLE JAVA Mouse Right Click Example Java. This Java code on Mouse Right Click Example explains how to handle the right clicks of mouse key. Other way of event handling is: The static constant modifier MouseEvent.BUTTON3_MASK or the method isMetaDown () of MouseEvent differentiates the right clicks. Instead of button btn, it can be anyGUI component like
BYTE TO CHAR JAVA
After knowing primitive data types and Java rules of Data Type Casting (Type Conversion), let us cast byte to char as an example. The byte takes 1 byte of memory and char takes 2 bytes of memory. Here, casting rules do not work like 1 byte value can be assigned to 2 bytes implicitly, as byte can take negative values where as char does not. INSERT RECORD JDBC KEYBOARD INPUT Insert Record JDBC Keyboard Input. To take record particulars from keyboard and insert them in the Employee table. Note: See that there exists an Employee table by the time this program is executed. This can be done with Create Table. stmt.executeUpdate (“insert into Employee values (“+id+ “, ‘”+name+”‘,”+salary+ THROWS EXCEPTION ALTERNATIVE TO TRY CATCH In the above program, instead of try-catch, throws is used in the main () method declaration. This is nothing but rethrowing the exception to the system to handle it. In this type of alternative arrangement, the program compiles and runs happily as long as problem does not arise (when def.txt file exists). CLIENT TO SERVER EXAMPLE JAVA Before going into the details of client-to-server communication, it is advised to go through Networking – Introduction and Communication with TCP/IP Protocol to know the terms and basics of networking and the way Java supports.. This is the first application in one-way communication.In one-way communication, here, client sends to server but server does not send back to client. CREATE USER DEFINED PACKAGES JAVA Steps of creating User Defined Packages Java and using them. Create a package with a .class file. set the classpath from the directory from which you would like to access. It may be in a different drive and directory. Let us call it as a target directory. Write a program and use the file from the package. FIRST SERVLET EXAMPLE LOGIN SCREEN VALIDATION Login Validation. localhost: It is the system where Tomcat server is running. Here, localhost is treated as the server. In realtime, actual name of server comes. 8888: It is the port number on which Tomcat is running. india: It is the name of the folder you created and placed in web-app folder. roses: It is the alias name of the Validation STRONGLY TYPED LANGUAGE A strongly typed language compiler enforces strict rules over the operations, what programmer can do, on data types and also passing parameters and return type to a method. An advantage of strongly typed language is it gives consistency over the results (by declaring the variables with data types). Specific operations are allowed on certaintypes.
JAVA DRAW OVALS
Java Draw Ovals. Summary: In this tutorial "Java Draw Ovals", you learn drawing of drawing ovals in Java graphics. After learning rectangles drawing, let us see the oval. Oval (Latin: Ovum meaning egg) is an elliptical shape rounded at both ends. JAVA TUTORIAL KEY EVENT, KEYBOARD INPUT AND KEYLISTENER Java Tutorial Key Event, Keyboard Input and KeyListener. Keyboard generate KeyEvent and handled by KeyListener overriding 3 abstract methods. Example given with Screenshot where key typed is displayed in TextField. Every component either software (like button) or hardware (like keyboard or mouse) when interacted by the user generates anevent.
MOUSE RIGHT CLICK EXAMPLE JAVA Mouse Right Click Example Java. This Java code on Mouse Right Click Example explains how to handle the right clicks of mouse key. Other way of event handling is: The static constant modifier MouseEvent.BUTTON3_MASK or the method isMetaDown () of MouseEvent differentiates the right clicks. Instead of button btn, it can be anyGUI component like
BYTE TO CHAR JAVA
After knowing primitive data types and Java rules of Data Type Casting (Type Conversion), let us cast byte to char as an example. The byte takes 1 byte of memory and char takes 2 bytes of memory. Here, casting rules do not work like 1 byte value can be assigned to 2 bytes implicitly, as byte can take negative values where as char does not. INSERT RECORD JDBC KEYBOARD INPUT Insert Record JDBC Keyboard Input. To take record particulars from keyboard and insert them in the Employee table. Note: See that there exists an Employee table by the time this program is executed. This can be done with Create Table. stmt.executeUpdate (“insert into Employee values (“+id+ “, ‘”+name+”‘,”+salary+ THROWS EXCEPTION ALTERNATIVE TO TRY CATCH In the above program, instead of try-catch, throws is used in the main () method declaration. This is nothing but rethrowing the exception to the system to handle it. In this type of alternative arrangement, the program compiles and runs happily as long as problem does not arise (when def.txt file exists). CREATE USER DEFINED PACKAGES JAVA Steps of creating User Defined Packages Java and using them. Create a package with a .class file. set the classpath from the directory from which you would like to access. It may be in a different drive and directory. Let us call it as a target directory. Write a program and use the file from the package. DRAW IMAGES EXAMPLE JAVA Output screenshot on Draw Images Example Java. Let us see the coding. URL url1 = getCodeBase(); Image img = getImage(url1, "bird2.gif"); Any image to be drawn should be converted into an object of Image class (like ImageIcon in case of Swing). The getImage() method of Applet class returns an object of Image, img.This method takes two parameters – the address of the image (bird2.gif) as an SCRIPTLET EXPRESSION DECLARATION JSP EXAMPLE Scriptlet, Expression and Declaration are the three building blocks of JSP code. Let us see the appropriate places when to use them and finally we will do one example where all the three are used. Note: It is advised to go through the separate examples on Scriptlets, expressions and declarations before going through this. Here, all the three are placed in one example.DOUBLE TO BYTE JAVA
Output screenshot of double to byte Java. byte b1 = d1; The above statement raises a compilation error" of possible loss of precision ". byte b1 = (byte) d1; The double d1 is explicitly type casted to byte b1. Observe, the syntax of explicit casting. On both sides, it shouldbe byte only.
BYTE TO CHAR JAVA
After knowing primitive data types and Java rules of Data Type Casting (Type Conversion), let us cast byte to char as an example. The byte takes 1 byte of memory and char takes 2 bytes of memory. Here, casting rules do not work like 1 byte value can be assigned to 2 bytes implicitly, as byte can take negative values where as char does not. THROWS EXCEPTION ALTERNATIVE TO TRY CATCH In the above program, instead of try-catch, throws is used in the main () method declaration. This is nothing but rethrowing the exception to the system to handle it. In this type of alternative arrangement, the program compiles and runs happily as long as problem does not arise (when def.txt file exists). MULTITHREADING REALTIME EXAMPLES Multithreading Realtime Examples. Background jobs like running application servers like Oracle application server, Web servers like Tomcat ctc which will come into action whenever a request comes. Performing some execution while I/O blocked. Gathering information from different web services running in parallel. MOUSE DOUBLE CLICK EXAMPLE JAVA The code explains how to handle double clicks of mouse key.You even can handle triple clicks also, if required.. Example on Mouse Double Click Example import java.awt.*; import java.awt.event.*; public class Demo extends Frame { Button btn; public Demo() { setLayout(new FlowLayout()); btn = new Button("OK"); btn.addMouseListener(new MyListener()); add(btn); setSize(300,300); setVisible(true TEXTFIELD APPLET ADDING TWO NUMBERS TextField Applet Adding Two Numbers. After validating user name and password using TextField in an application (application extends frame), let us rewrite the same program using applets but with a different functionality. We take two numbers from the user and display the sum of two numbers. The following program comes with 3 textfields.
SETCONTENTTYPE() METHOD EXAMPLE setContentType () Method Example. We know when a Servlet is loaded, the Servlet container creates an object of Servlet, calls service () method, creates an object of HttpServletRequest and also an object of HttpServletResponse and passes these objects to service () method. The job of HttpServletResponse (referred as response object in this CLIENT TO SERVER EXAMPLE JAVA Before going into the details of client-to-server communication, it is advised to go through Networking – Introduction and Communication with TCP/IP Protocol to know the terms and basics of networking and the way Java supports.. This is the first application in one-way communication.In one-way communication, here, client sends to server but server does not send back to client. CREATE USER DEFINED PACKAGES JAVA Steps of creating User Defined Packages Java and using them. Create a package with a .class file. set the classpath from the directory from which you would like to access. It may be in a different drive and directory. Let us call it as a target directory. Write a program and use the file from the package. CONVERT APPLICATION TO APPLET Changes to be made to Application to Applet conversion. 1. Add the statement "import java.applet" 2. Replace extends Frame with Applet 3. Replace the constructor with init() method 4. Check the layout (for Applet, the default layout is FlowLayout and for Frame, it is BorderLayout) 5. Delete setXXX() methods like setSize() etc. 6. Delete main() method 7. Add an HTML fileJAVA DRAW OVALS
Java Draw Ovals. Summary: In this tutorial "Java Draw Ovals", you learn drawing of drawing ovals in Java graphics. After learning rectangles drawing, let us see the oval. Oval (Latin: Ovum meaning egg) is an elliptical shape rounded at both ends. SCRIPTLET EXPRESSION DECLARATION JSP EXAMPLE Scriptlet, Expression and Declaration are the three building blocks of JSP code. Let us see the appropriate places when to use them and finally we will do one example where all the three are used. Note: It is advised to go through the separate examples on Scriptlets, expressions and declarations before going through this. Here, all the three are placed in one example. MOUSE DOUBLE CLICK EXAMPLE JAVA The code explains how to handle double clicks of mouse key.You even can handle triple clicks also, if required.. Example on Mouse Double Click Example import java.awt.*; import java.awt.event.*; public class Demo extends Frame { Button btn; public Demo() { setLayout(new FlowLayout()); btn = new Button("OK"); btn.addMouseListener(new MyListener()); add(btn); setSize(300,300); setVisible(true THREAD ARRAY JAVA EXAMPLE Create Thread Array Example. Summary: By the end of this tutorial "Create Thread Array Example", you will be comfortable in creation of array of threads and starting them. Explained in simple terms. After knowing how to create multiple threads (both lightweight and heavyweight), let us modify the code to suit for creation of multiple threads as an array. FIRST SERVLET EXAMPLE LOGIN SCREEN VALIDATION Login Validation. localhost: It is the system where Tomcat server is running. Here, localhost is treated as the server. In realtime, actual name of server comes. 8888: It is the port number on which Tomcat is running. india: It is the name of the folder you created and placed in web-app folder. roses: It is the alias name of the Validation HTTPSESSION EXAMPLE HIT COUNT HttpSession Example on Visitor Hit Count. After learning Session, Session tracking, Session ID and HttpSession and its methods, let us write a program to maintain session tracking using HttpSession interface.. The aim of this code is, in a single session, the user visits the site (HitCount servlet) by clicking the submit button number of times.Everytime, the existing hit count number is THROWS EXCEPTION ALTERNATIVE TO TRY CATCH In the above program, instead of try-catch, throws is used in the main () method declaration. This is nothing but rethrowing the exception to the system to handle it. In this type of alternative arrangement, the program compiles and runs happily as long as problem does not arise (when def.txt file exists). CLIENT TO SERVER EXAMPLE JAVA Before going into the details of client-to-server communication, it is advised to go through Networking – Introduction and Communication with TCP/IP Protocol to know the terms and basics of networking and the way Java supports.. This is the first application in one-way communication.In one-way communication, here, client sends to server but server does not send back to client. CREATE USER DEFINED PACKAGES JAVA Steps of creating User Defined Packages Java and using them. Create a package with a .class file. set the classpath from the directory from which you would like to access. It may be in a different drive and directory. Let us call it as a target directory. Write a program and use the file from the package. CONVERT APPLICATION TO APPLET Changes to be made to Application to Applet conversion. 1. Add the statement "import java.applet" 2. Replace extends Frame with Applet 3. Replace the constructor with init() method 4. Check the layout (for Applet, the default layout is FlowLayout and for Frame, it is BorderLayout) 5. Delete setXXX() methods like setSize() etc. 6. Delete main() method 7. Add an HTML fileJAVA DRAW OVALS
Java Draw Ovals. Summary: In this tutorial "Java Draw Ovals", you learn drawing of drawing ovals in Java graphics. After learning rectangles drawing, let us see the oval. Oval (Latin: Ovum meaning egg) is an elliptical shape rounded at both ends. SCRIPTLET EXPRESSION DECLARATION JSP EXAMPLE Scriptlet, Expression and Declaration are the three building blocks of JSP code. Let us see the appropriate places when to use them and finally we will do one example where all the three are used. Note: It is advised to go through the separate examples on Scriptlets, expressions and declarations before going through this. Here, all the three are placed in one example. MOUSE DOUBLE CLICK EXAMPLE JAVA The code explains how to handle double clicks of mouse key.You even can handle triple clicks also, if required.. Example on Mouse Double Click Example import java.awt.*; import java.awt.event.*; public class Demo extends Frame { Button btn; public Demo() { setLayout(new FlowLayout()); btn = new Button("OK"); btn.addMouseListener(new MyListener()); add(btn); setSize(300,300); setVisible(true THREAD ARRAY JAVA EXAMPLE Create Thread Array Example. Summary: By the end of this tutorial "Create Thread Array Example", you will be comfortable in creation of array of threads and starting them. Explained in simple terms. After knowing how to create multiple threads (both lightweight and heavyweight), let us modify the code to suit for creation of multiple threads as an array. FIRST SERVLET EXAMPLE LOGIN SCREEN VALIDATION Login Validation. localhost: It is the system where Tomcat server is running. Here, localhost is treated as the server. In realtime, actual name of server comes. 8888: It is the port number on which Tomcat is running. india: It is the name of the folder you created and placed in web-app folder. roses: It is the alias name of the Validation HTTPSESSION EXAMPLE HIT COUNT HttpSession Example on Visitor Hit Count. After learning Session, Session tracking, Session ID and HttpSession and its methods, let us write a program to maintain session tracking using HttpSession interface.. The aim of this code is, in a single session, the user visits the site (HitCount servlet) by clicking the submit button number of times.Everytime, the existing hit count number is THROWS EXCEPTION ALTERNATIVE TO TRY CATCH In the above program, instead of try-catch, throws is used in the main () method declaration. This is nothing but rethrowing the exception to the system to handle it. In this type of alternative arrangement, the program compiles and runs happily as long as problem does not arise (when def.txt file exists). SCRIPTLET EXPRESSION DECLARATION JSP EXAMPLE Scriptlet, Expression and Declaration are the three building blocks of JSP code. Let us see the appropriate places when to use them and finally we will do one example where all the three are used. Note: It is advised to go through the separate examples on Scriptlets, expressions and declarations before going through this. Here, all the three are placed in one example. FIRST SERVLET EXAMPLE LOGIN SCREEN VALIDATION Login Validation. localhost: It is the system where Tomcat server is running. Here, localhost is treated as the server. In realtime, actual name of server comes. 8888: It is the port number on which Tomcat is running. india: It is the name of the folder you created and placed in web-app folder. roses: It is the alias name of the Validation JAVA TUTORIAL KEY EVENT, KEYBOARD INPUT AND KEYLISTENER Java Tutorial Key Event, Keyboard Input and KeyListener. Keyboard generate KeyEvent and handled by KeyListener overriding 3 abstract methods. Example given with Screenshot where key typed is displayed in TextField. Every component either software (like button) or hardware (like keyboard or mouse) when interacted by the user generates anevent.
CHAT PROGRAM TWO WAY COMMUNICATION JAVA Total 4 programs are given in TCP/IP protocol based communication. 4th application – Chat Program Java: Chat communication (two-way continuous) This is the last one of the four series where client and server talks continuously until one disconnets. Chat communication is the process of exchanging messages between two systems continuously. THREAD ARRAY JAVA EXAMPLE Create Thread Array Example. Summary: By the end of this tutorial "Create Thread Array Example", you will be comfortable in creation of array of threads and starting them. Explained in simple terms. After knowing how to create multiple threads (both lightweight and heavyweight), let us modify the code to suit for creation of multiple threads as an array.INT TO SHORT JAVA
After knowing primitive data types and Java rules of Data Type Casting (Type Conversion), let us cast int to short. The int takes 4 bytes of memory and short takes 2 bytes of memory. Assigning 4 bytes of memory to 2 bytes goes by explicit casting where Programmer should do by himself. byte –> short –> int –> long –> float –> double. CREATING OBJECT WITHOUT NEW KEYWORD Hello h1 = (Hello) obj1; The object obj1 is explicitly type casted to Hello object, h1. It is a long process. Total there are 5 styles of creating an object in Java without new keyword. This is one. Would you like to know the other 4 styles also. USE CONNECTION POOL IN SPRING Dependency injection (DI) is the style used by Spring to achieve IoC. Even though, many say IoC and DI both are same, but they are very different. In the earlier programs, we used connection pooling very specific to Weblogic. If Websphere or JBoss are used, the classes will change in the XML file. MOUSE RIGHT CLICK EXAMPLE JAVA Mouse Right Click Example Java. This Java code on Mouse Right Click Example explains how to handle the right clicks of mouse key. Other way of event handling is: The static constant modifier MouseEvent.BUTTON3_MASK or the method isMetaDown () of MouseEvent differentiates the right clicks. Instead of button btn, it can be anyGUI component like
GETREQUESTURL() VS GETREQUESTURI() getRequestURL () and getRequestURI () methods are defined in HttpServletRequest interface. These two are used by the Servlet to retrieve the URL information (written in ACTION attribute of FORM tag) used by the client to call the servlet. getRequestURL () vs getRequestURI () differ in CREATE USER DEFINED PACKAGES JAVA Steps of creating User Defined Packages Java and using them. Create a package with a .class file. set the classpath from the directory from which you would like to access. It may be in a different drive and directory. Let us call it as a target directory. Write a CONVERT APPLICATION TO APPLET Changes to be made to Application to Applet conversion. 1. Add the statement "import java.applet" 2. Replace extends Frame with Applet 3. Replace the constructor with init() method 4. Check the layout (for Applet, the default layout is FlowLayout and for Frame, it is BorderLayout) 5. Delete setXXX() methods like setSize() etc. 6. Delete main() method 7. Add an HTML fileJAVA DRAW OVALS
Java Draw Ovals. Summary: In this tutorial "Java Draw Ovals", you learn drawing of drawing ovals in Java graphics. After learning rectangles drawing, let us see the oval. Oval (Latin: Ovum meaning egg) is an elliptical shape rounded at both ends. MOUSE DOUBLE CLICK EXAMPLE JAVA The code explains how to handle double clicks of mouse key.You even can handle triple clicks also, if required.. Example on Mouse Double Click Example import java.awt.*; import java.awt.event.*; public class Demo extends Frame { Button btn; public Demo() { setLayout(new FlowLayout()); btn = new Button("OK"); btn.addMouseListener(new MyListener()); add(btn); setSize(300,300); setVisible(true THREAD ARRAY JAVA EXAMPLE Create Thread Array Example. Summary: By the end of this tutorial "Create Thread Array Example", you will be comfortable in creation of array of threads and starting them. Explained in simple terms. After knowing how to create multiple threads (both lightweight and heavyweight), let us modify the code to suit for creation of multiple threads as an array. CREATING OBJECT WITHOUT NEW KEYWORD Hello h1 = (Hello) obj1; The object obj1 is explicitly type casted to Hello object, h1. It is a long process. Total there are 5 styles of creating an object in Java without new keyword. This is one. Would you like to know the other 4 styles also. HTTPSESSION EXAMPLE HIT COUNT HttpSession Example on Visitor Hit Count. After learning Session, Session tracking, Session ID and HttpSession and its methods, let us write a program to maintain session tracking using HttpSession interface.. The aim of this code is, in a single session, the user visits the site (HitCount servlet) by clicking the submit button number of times.Everytime, the existing hit count number is MOUSE RIGHT CLICK EXAMPLE JAVA Mouse Right Click Example Java. This Java code on Mouse Right Click Example explains how to handle the right clicks of mouse key. Other way of event handling is: The static constant modifier MouseEvent.BUTTON3_MASK or the method isMetaDown () of MouseEvent differentiates the right clicks. Instead of button btn, it can be anyGUI component like
THROWS EXCEPTION ALTERNATIVE TO TRY CATCH In the above program, instead of try-catch, throws is used in the main () method declaration. This is nothing but rethrowing the exception to the system to handle it. In this type of alternative arrangement, the program compiles and runs happily as long as problem does not arise (when def.txt file exists). GETREQUESTURL() VS GETREQUESTURI() getRequestURL () and getRequestURI () methods are defined in HttpServletRequest interface. These two are used by the Servlet to retrieve the URL information (written in ACTION attribute of FORM tag) used by the client to call the servlet. getRequestURL () vs getRequestURI () differ in the length of the URL returned. CREATE USER DEFINED PACKAGES JAVA Steps of creating User Defined Packages Java and using them. Create a package with a .class file. set the classpath from the directory from which you would like to access. It may be in a different drive and directory. Let us call it as a target directory. Write a CONVERT APPLICATION TO APPLET Changes to be made to Application to Applet conversion. 1. Add the statement "import java.applet" 2. Replace extends Frame with Applet 3. Replace the constructor with init() method 4. Check the layout (for Applet, the default layout is FlowLayout and for Frame, it is BorderLayout) 5. Delete setXXX() methods like setSize() etc. 6. Delete main() method 7. Add an HTML fileJAVA DRAW OVALS
Java Draw Ovals. Summary: In this tutorial "Java Draw Ovals", you learn drawing of drawing ovals in Java graphics. After learning rectangles drawing, let us see the oval. Oval (Latin: Ovum meaning egg) is an elliptical shape rounded at both ends. MOUSE DOUBLE CLICK EXAMPLE JAVA The code explains how to handle double clicks of mouse key.You even can handle triple clicks also, if required.. Example on Mouse Double Click Example import java.awt.*; import java.awt.event.*; public class Demo extends Frame { Button btn; public Demo() { setLayout(new FlowLayout()); btn = new Button("OK"); btn.addMouseListener(new MyListener()); add(btn); setSize(300,300); setVisible(true THREAD ARRAY JAVA EXAMPLE Create Thread Array Example. Summary: By the end of this tutorial "Create Thread Array Example", you will be comfortable in creation of array of threads and starting them. Explained in simple terms. After knowing how to create multiple threads (both lightweight and heavyweight), let us modify the code to suit for creation of multiple threads as an array. CREATING OBJECT WITHOUT NEW KEYWORD Hello h1 = (Hello) obj1; The object obj1 is explicitly type casted to Hello object, h1. It is a long process. Total there are 5 styles of creating an object in Java without new keyword. This is one. Would you like to know the other 4 styles also. HTTPSESSION EXAMPLE HIT COUNT HttpSession Example on Visitor Hit Count. After learning Session, Session tracking, Session ID and HttpSession and its methods, let us write a program to maintain session tracking using HttpSession interface.. The aim of this code is, in a single session, the user visits the site (HitCount servlet) by clicking the submit button number of times.Everytime, the existing hit count number is MOUSE RIGHT CLICK EXAMPLE JAVA Mouse Right Click Example Java. This Java code on Mouse Right Click Example explains how to handle the right clicks of mouse key. Other way of event handling is: The static constant modifier MouseEvent.BUTTON3_MASK or the method isMetaDown () of MouseEvent differentiates the right clicks. Instead of button btn, it can be anyGUI component like
THROWS EXCEPTION ALTERNATIVE TO TRY CATCH In the above program, instead of try-catch, throws is used in the main () method declaration. This is nothing but rethrowing the exception to the system to handle it. In this type of alternative arrangement, the program compiles and runs happily as long as problem does not arise (when def.txt file exists). GETREQUESTURL() VS GETREQUESTURI() getRequestURL () and getRequestURI () methods are defined in HttpServletRequest interface. These two are used by the Servlet to retrieve the URL information (written in ACTION attribute of FORM tag) used by the client to call the servlet. getRequestURL () vs getRequestURI () differ in the length of the URL returned. CLIENT TO SERVER EXAMPLE JAVA Before going into the details of client-to-server communication, it is advised to go through Networking – Introduction and Communication with TCP/IP Protocol to know the terms and basics of networking and the way Java supports.. This is the first application in one-way communication.In one-way communication, here, client sends to server but server does not send back to client. SCRIPTLET EXPRESSION DECLARATION JSP EXAMPLE Scriptlet, Expression and Declaration are the three building blocks of JSP code. Let us see the appropriate places when to use them and finally we will do one example where all the three are used. Note: It is advised to go through the separate examples on Scriptlets, expressions and declarations before going through this. Here, all the three are placed in one example. FIRST SERVLET EXAMPLE LOGIN SCREEN VALIDATION Login Validation. localhost: It is the system where Tomcat server is running. Here, localhost is treated as the server. In realtime, actual name of server comes. 8888: It is the port number on which Tomcat is running. india: It is the name of the folder you created and placed in web-app folder. roses: It is the alias name of the Validation MOUSE RIGHT CLICK EXAMPLE JAVA Mouse Right Click Example Java. This Java code on Mouse Right Click Example explains how to handle the right clicks of mouse key. Other way of event handling is: The static constant modifier MouseEvent.BUTTON3_MASK or the method isMetaDown () of MouseEvent differentiates the right clicks. Instead of button btn, it can be anyGUI component like
FLOAT TO LONG JAVA
After knowing Java rules of Data Type Casting (Type Conversion), let us cast float to long.By memory-wise, float takes 4 bytes of memory and long takes 8 bytes of memory. Even then, a float value cannot be assigned to a long (here, rules of casting do not work) as float carries a mantissa (value after decimal point) where as long does not. CREATING OBJECT WITHOUT NEW KEYWORD Hello h1 = (Hello) obj1; The object obj1 is explicitly type casted to Hello object, h1. It is a long process. Total there are 5 styles of creating an object in Java without new keyword. This is one. Would you like to know the other 4 styles also. JAVA TUTORIAL KEY EVENT, KEYBOARD INPUT AND KEYLISTENER Java Tutorial Key Event, Keyboard Input and KeyListener. Keyboard generate KeyEvent and handled by KeyListener overriding 3 abstract methods. Example given with Screenshot where key typed is displayed in TextField. Every component either software (like button) or hardware (like keyboard or mouse) when interacted by the user generates anevent.
HTTPSERVLETREQUEST VS HTTPSERVLETRESPONSE HttpServletRequest vs HttpServletResponse. Both HttpServletRequest and HttpServletResponse are inevitable in each Servlet, the Programmer write. Both exist in Servlet code as parameters to service () method. Even a Novice should be acquainted of these two interfaces. Both are interfaces from javax.servlet.http package. USE CONNECTION POOL IN SPRING Dependency injection (DI) is the style used by Spring to achieve IoC. Even though, many say IoC and DI both are same, but they are very different. In the earlier programs, we used connection pooling very specific to Weblogic. If Websphere or JBoss are used, the classes will change in the XML file. GETREQUESTURL() VS GETREQUESTURI() getRequestURL () and getRequestURI () methods are defined in HttpServletRequest interface. These two are used by the Servlet to retrieve the URL information (written in ACTION attribute of FORM tag) used by the client to call the servlet. getRequestURL () vs getRequestURI () differ in CREATE USER DEFINED PACKAGES JAVA Steps of creating User Defined Packages Java and using them. Create a package with a .class file. set the classpath from the directory from which you would like to access. It may be in a different drive and directory. Let us call it as a target directory. Write a CONVERT APPLICATION TO APPLET Changes to be made to Application to Applet conversion. 1. Add the statement "import java.applet" 2. Replace extends Frame with Applet 3. Replace the constructor with init() method 4. Check the layout (for Applet, the default layout is FlowLayout and for Frame, it is BorderLayout) 5. Delete setXXX() methods like setSize() etc. 6. Delete main() method 7. Add an HTML fileJAVA DRAW OVALS
Java Draw Ovals. Summary: In this tutorial "Java Draw Ovals", you learn drawing of drawing ovals in Java graphics. After learning rectangles drawing, let us see the oval. Oval (Latin: Ovum meaning egg) is an elliptical shape rounded at both ends. MOUSE DOUBLE CLICK EXAMPLE JAVA The code explains how to handle double clicks of mouse key.You even can handle triple clicks also, if required.. Example on Mouse Double Click Example import java.awt.*; import java.awt.event.*; public class Demo extends Frame { Button btn; public Demo() { setLayout(new FlowLayout()); btn = new Button("OK"); btn.addMouseListener(new MyListener()); add(btn); setSize(300,300); setVisible(true THREAD ARRAY JAVA EXAMPLE Create Thread Array Example. Summary: By the end of this tutorial "Create Thread Array Example", you will be comfortable in creation of array of threads and starting them. Explained in simple terms. After knowing how to create multiple threads (both lightweight and heavyweight), let us modify the code to suit for creation of multiple threads as an array. CREATING OBJECT WITHOUT NEW KEYWORD Hello h1 = (Hello) obj1; The object obj1 is explicitly type casted to Hello object, h1. It is a long process. Total there are 5 styles of creating an object in Java without new keyword. This is one. Would you like to know the other 4 styles also. HTTPSESSION EXAMPLE HIT COUNT HttpSession Example on Visitor Hit Count. After learning Session, Session tracking, Session ID and HttpSession and its methods, let us write a program to maintain session tracking using HttpSession interface.. The aim of this code is, in a single session, the user visits the site (HitCount servlet) by clicking the submit button number of times.Everytime, the existing hit count number is MOUSE RIGHT CLICK EXAMPLE JAVA Mouse Right Click Example Java. This Java code on Mouse Right Click Example explains how to handle the right clicks of mouse key. Other way of event handling is: The static constant modifier MouseEvent.BUTTON3_MASK or the method isMetaDown () of MouseEvent differentiates the right clicks. Instead of button btn, it can be anyGUI component like
THROWS EXCEPTION ALTERNATIVE TO TRY CATCH In the above program, instead of try-catch, throws is used in the main () method declaration. This is nothing but rethrowing the exception to the system to handle it. In this type of alternative arrangement, the program compiles and runs happily as long as problem does not arise (when def.txt file exists). GETREQUESTURL() VS GETREQUESTURI() getRequestURL () and getRequestURI () methods are defined in HttpServletRequest interface. These two are used by the Servlet to retrieve the URL information (written in ACTION attribute of FORM tag) used by the client to call the servlet. getRequestURL () vs getRequestURI () differ in the length of the URL returned. CREATE USER DEFINED PACKAGES JAVA Steps of creating User Defined Packages Java and using them. Create a package with a .class file. set the classpath from the directory from which you would like to access. It may be in a different drive and directory. Let us call it as a target directory. Write a CONVERT APPLICATION TO APPLET Changes to be made to Application to Applet conversion. 1. Add the statement "import java.applet" 2. Replace extends Frame with Applet 3. Replace the constructor with init() method 4. Check the layout (for Applet, the default layout is FlowLayout and for Frame, it is BorderLayout) 5. Delete setXXX() methods like setSize() etc. 6. Delete main() method 7. Add an HTML fileJAVA DRAW OVALS
Java Draw Ovals. Summary: In this tutorial "Java Draw Ovals", you learn drawing of drawing ovals in Java graphics. After learning rectangles drawing, let us see the oval. Oval (Latin: Ovum meaning egg) is an elliptical shape rounded at both ends. MOUSE DOUBLE CLICK EXAMPLE JAVA The code explains how to handle double clicks of mouse key.You even can handle triple clicks also, if required.. Example on Mouse Double Click Example import java.awt.*; import java.awt.event.*; public class Demo extends Frame { Button btn; public Demo() { setLayout(new FlowLayout()); btn = new Button("OK"); btn.addMouseListener(new MyListener()); add(btn); setSize(300,300); setVisible(true THREAD ARRAY JAVA EXAMPLE Create Thread Array Example. Summary: By the end of this tutorial "Create Thread Array Example", you will be comfortable in creation of array of threads and starting them. Explained in simple terms. After knowing how to create multiple threads (both lightweight and heavyweight), let us modify the code to suit for creation of multiple threads as an array. CREATING OBJECT WITHOUT NEW KEYWORD Hello h1 = (Hello) obj1; The object obj1 is explicitly type casted to Hello object, h1. It is a long process. Total there are 5 styles of creating an object in Java without new keyword. This is one. Would you like to know the other 4 styles also. HTTPSESSION EXAMPLE HIT COUNT HttpSession Example on Visitor Hit Count. After learning Session, Session tracking, Session ID and HttpSession and its methods, let us write a program to maintain session tracking using HttpSession interface.. The aim of this code is, in a single session, the user visits the site (HitCount servlet) by clicking the submit button number of times.Everytime, the existing hit count number is MOUSE RIGHT CLICK EXAMPLE JAVA Mouse Right Click Example Java. This Java code on Mouse Right Click Example explains how to handle the right clicks of mouse key. Other way of event handling is: The static constant modifier MouseEvent.BUTTON3_MASK or the method isMetaDown () of MouseEvent differentiates the right clicks. Instead of button btn, it can be anyGUI component like
THROWS EXCEPTION ALTERNATIVE TO TRY CATCH In the above program, instead of try-catch, throws is used in the main () method declaration. This is nothing but rethrowing the exception to the system to handle it. In this type of alternative arrangement, the program compiles and runs happily as long as problem does not arise (when def.txt file exists). GETREQUESTURL() VS GETREQUESTURI() getRequestURL () and getRequestURI () methods are defined in HttpServletRequest interface. These two are used by the Servlet to retrieve the URL information (written in ACTION attribute of FORM tag) used by the client to call the servlet. getRequestURL () vs getRequestURI () differ in the length of the URL returned. CLIENT TO SERVER EXAMPLE JAVA Before going into the details of client-to-server communication, it is advised to go through Networking – Introduction and Communication with TCP/IP Protocol to know the terms and basics of networking and the way Java supports.. This is the first application in one-way communication.In one-way communication, here, client sends to server but server does not send back to client. SCRIPTLET EXPRESSION DECLARATION JSP EXAMPLE Scriptlet, Expression and Declaration are the three building blocks of JSP code. Let us see the appropriate places when to use them and finally we will do one example where all the three are used. Note: It is advised to go through the separate examples on Scriptlets, expressions and declarations before going through this. Here, all the three are placed in one example. FIRST SERVLET EXAMPLE LOGIN SCREEN VALIDATION Login Validation. localhost: It is the system where Tomcat server is running. Here, localhost is treated as the server. In realtime, actual name of server comes. 8888: It is the port number on which Tomcat is running. india: It is the name of the folder you created and placed in web-app folder. roses: It is the alias name of the Validation MOUSE RIGHT CLICK EXAMPLE JAVA Mouse Right Click Example Java. This Java code on Mouse Right Click Example explains how to handle the right clicks of mouse key. Other way of event handling is: The static constant modifier MouseEvent.BUTTON3_MASK or the method isMetaDown () of MouseEvent differentiates the right clicks. Instead of button btn, it can be anyGUI component like
FLOAT TO LONG JAVA
After knowing Java rules of Data Type Casting (Type Conversion), let us cast float to long.By memory-wise, float takes 4 bytes of memory and long takes 8 bytes of memory. Even then, a float value cannot be assigned to a long (here, rules of casting do not work) as float carries a mantissa (value after decimal point) where as long does not. CREATING OBJECT WITHOUT NEW KEYWORD Hello h1 = (Hello) obj1; The object obj1 is explicitly type casted to Hello object, h1. It is a long process. Total there are 5 styles of creating an object in Java without new keyword. This is one. Would you like to know the other 4 styles also. JAVA TUTORIAL KEY EVENT, KEYBOARD INPUT AND KEYLISTENER Java Tutorial Key Event, Keyboard Input and KeyListener. Keyboard generate KeyEvent and handled by KeyListener overriding 3 abstract methods. Example given with Screenshot where key typed is displayed in TextField. Every component either software (like button) or hardware (like keyboard or mouse) when interacted by the user generates anevent.
HTTPSERVLETREQUEST VS HTTPSERVLETRESPONSE HttpServletRequest vs HttpServletResponse. Both HttpServletRequest and HttpServletResponse are inevitable in each Servlet, the Programmer write. Both exist in Servlet code as parameters to service () method. Even a Novice should be acquainted of these two interfaces. Both are interfaces from javax.servlet.http package. USE CONNECTION POOL IN SPRING Dependency injection (DI) is the style used by Spring to achieve IoC. Even though, many say IoC and DI both are same, but they are very different. In the earlier programs, we used connection pooling very specific to Weblogic. If Websphere or JBoss are used, the classes will change in the XML file. GETREQUESTURL() VS GETREQUESTURI() getRequestURL () and getRequestURI () methods are defined in HttpServletRequest interface. These two are used by the Servlet to retrieve the URL information (written in ACTION attribute of FORM tag) used by the client to call the servlet. getRequestURL () vs getRequestURI () differ inWAY2JAVA
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