visual basic 2008 barcode generator Java Demystified in Java

Encoder QR Code JIS X 0510 in Java Java Demystified

Java Demystified
Generating QR Code ISO/IEC18004 In Java
Using Barcode generator for Java Control to generate, create QR Code image in Java applications.
Decode Quick Response Code In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
Table 13-1
Generate Bar Code In Java
Using Barcode generation for Java Control to generate, create barcode image in Java applications.
Bar Code Reader In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
A List of Data Types for Use with the setXXX() and getXXX() Methods
Denso QR Bar Code Encoder In C#.NET
Using Barcode generation for VS .NET Control to generate, create QR Code JIS X 0510 image in Visual Studio .NET applications.
QR Code JIS X 0510 Encoder In Visual Studio .NET
Using Barcode generation for ASP.NET Control to generate, create Denso QR Bar Code image in ASP.NET applications.
CHAPTER 13 JDBC and Java Data Objects
Make QR Code JIS X 0510 In .NET Framework
Using Barcode encoder for VS .NET Control to generate, create QR Code image in VS .NET applications.
QR-Code Generation In Visual Basic .NET
Using Barcode maker for VS .NET Control to generate, create QR Code image in .NET applications.
Exceptions
DataBar Encoder In Java
Using Barcode printer for Java Control to generate, create DataBar image in Java applications.
Print GTIN - 12 In Java
Using Barcode encoder for Java Control to generate, create UPC-A Supplement 5 image in Java applications.
JDBC methods throw three kinds of exceptions: SQLExceptions, SQLWarnings, and DataTruncation SQLExceptions commonly reflects an SQL syntax error in the query and is thrown by many of the methods contained in the javasql package Hopefully, the syntax errors in your code get resolved quickly In production, connectivity issues with the database most commonly cause this exception It can also be caused by subtle coding errors, such as trying to access an object that has been closed For example, you try to roll back a transaction in a catch clause and don t check first whether the database connection is still valid The getNextException() method of the SQLExceptions object is used to return details about the SQL error or a null value if the last exception was retrieved The getErrorCode() method of the SQLException object is used to retrieve vendor-specific error codes The SQLWarnings exception throws warnings received by the Connection object from the DBMS The getWarnings() method of the Connection object retrieves the warning, and the getNextWarning() method of the Connection object retrieves subsequent warnings Finally, whenever data is lost due to truncation of the data value, a DataTruncation exception is thrown
GTIN - 128 Creator In Java
Using Barcode encoder for Java Control to generate, create UCC-128 image in Java applications.
Draw 2D Barcode In Java
Using Barcode printer for Java Control to generate, create Matrix 2D Barcode image in Java applications.
Quiz
Draw MSI Plessey In Java
Using Barcode drawer for Java Control to generate, create MSI Plessey image in Java applications.
EAN13 Creation In Java
Using Barcode drawer for Android Control to generate, create EAN-13 Supplement 5 image in Android applications.
1 How is storing data in a DBMS different from storing data in a file 2 What is a resultset 3 How can you retrieve data stored in a resultset 4 How do you move the virtual cursor throughout the resultset 5 How can you update a value in a resultset 6 How can you update a value in a table 7 What is metadata 8 How do you update metadata 9 How do you select a column in a resultset 10 Why would you retrieve metadata
Draw UCC - 12 In None
Using Barcode generation for Font Control to generate, create GTIN - 12 image in Font applications.
Recognizing GTIN - 128 In Visual Basic .NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET applications.
This page intentionally left blank
Encoding EAN-13 Supplement 5 In Java
Using Barcode generation for BIRT Control to generate, create EAN 13 image in Eclipse BIRT applications.
Decoding EAN13 In .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
CHAPTER
Encode Barcode In .NET
Using Barcode creator for .NET framework Control to generate, create barcode image in .NET applications.
Paint Bar Code In None
Using Barcode creator for Office Word Control to generate, create bar code image in Microsoft Word applications.
Java Applets
A Java applet is a small Java application used to enhance the capabilities of a web page because a Java applet can do things that the web page can t do directly itself, such as calculations A web page is a document that is written in Hypertext Markup Language (HTML) HTML instructions function similarly to how keywords and statements in Java instruct the Java environment to do something However, HTML lacks the keywords that are common to Java For example, HTML cannot tell a web browser to make decisions or repeat instructions This is where a Java applet comes in a Java applet embellishes the capabilities of HTML You ll learn how to create your own Java applets in this chapter
Java Applet Basics
A Java applet is a program you write using Java, in much the same way as the other Java applications you created throughout this book However, a Java applet does not have a main() method Instead, a Java applet has 200 or so methods inherited from the JApplet class These methods are called by the browser in response to events
Copyright 2004 by The McGraw-Hill Companies Click here for terms of use
Java Demystified
that occur when the browser runs Your job is to override these methods, providing them with your own Java statements that are executed when the browser calls these methods Here s how this works: Let s say you created a browser-based registration form for your school using a Java applet This form enables students to register for classes over the Internet A student visits the school s website and clicks the registration link, and the browser loads and runs your Java applet One of the first things the browser does is to call the Java applet s paint() method The paint() method contains statements that draw the registration form of your Java applet on the screen Your job is to place statements in the paint() method that draw the form Now suppose the student drags the browser window to a different location on the desktop This becomes a browser event something that happens that might require the browser to react In this example, the browser needs to redraw the form in the new location on the desktop The browser reacts to this event by calling the Java applet s paint() method You re probably puzzled at why there isn t a main() method in the Java applet To answer this question, we need to return to the concepts you learned at the beginning of this book The main() method is the entry point into a Java application Whenever a Java application executes, the Java environment calls the main() method and executes each statement within the main() method sequentially, until the last statement executes or until a statement tells the Java environment to terminate the program A Java applet is really an extension of the browser program, and they both work as a team The entry point is the browser, not the Java applet The Java applet simply defines methods that supplement the browser program A program that runs a Java applet is called an applet container Therefore, a browser is an applet container The Java 2 Software Development Kit has a program called the appletviewer that s used to test Java applets This, too, is an applet container, and you ll learn how to use it later in this chapter We ll use the term browser throughout this book to refer to an applet container because most of your Java applets will be running in a browser A browser doesn t understand Java Therefore, the browser gets help from the Java class loader whenever the browser encounters a Java applet The Java class loader is a program that loads a Java applet into memory and creates an object of the Java applet class that contains methods that can be called upon when the browser needs certain tasks to be performed
Copyright © OnBarcode.com . All rights reserved.