visual basic barcode program With a class name in Java

Paint PDF 417 in Java With a class name

With a class name
PDF-417 2d Barcode Scanner In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
PDF-417 2d Barcode Creator In Java
Using Barcode generator for Java Control to generate, create PDF417 image in Java applications.
4: Flow Control, Exceptions, and Assertions
PDF-417 2d Barcode Decoder In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
Barcode Encoder In Java
Using Barcode creation for Java Control to generate, create barcode image in Java applications.
You can combine switches to, say, disable assertions in a single class, but keep them enabled for all others, as follows:
Read Barcode In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
PDF417 Drawer In C#.NET
Using Barcode encoder for .NET framework Control to generate, create PDF-417 2d barcode image in .NET applications.
java -ea -da:com.geeksanonymous.Foo
PDF417 Printer In VS .NET
Using Barcode printer for ASP.NET Control to generate, create PDF-417 2d barcode image in ASP.NET applications.
PDF-417 2d Barcode Creator In .NET Framework
Using Barcode creation for .NET framework Control to generate, create PDF 417 image in .NET applications.
The preceding command line tells the JVM to enable assertions in general, but disable them in the class com.geeksanonymous.Foo. You can do the same selectivity for a package as follows:
Making PDF-417 2d Barcode In VB.NET
Using Barcode generator for .NET Control to generate, create PDF 417 image in VS .NET applications.
Data Matrix ECC200 Creation In Java
Using Barcode encoder for Java Control to generate, create Data Matrix 2d barcode image in Java applications.
java -ea -da:com.geeksanonymous
1D Barcode Encoder In Java
Using Barcode drawer for Java Control to generate, create Linear image in Java applications.
Create Code 39 Extended In Java
Using Barcode generator for Java Control to generate, create Code 3/9 image in Java applications.
The preceding command line tells the JVM to enable assertions in general, but disable them in the package com.geeksanonymous, and all of its subpackages! You may not be familiar with the term subpackages, since there wasn t much use of that term prior to assertions. A subpackage is any package in a subdirectory of the named package. For example, look at the following directory tree:
ISSN Generation In Java
Using Barcode printer for Java Control to generate, create International Standard Serial Number image in Java applications.
UPC Symbol Encoder In None
Using Barcode encoder for Excel Control to generate, create GS1 - 12 image in Excel applications.
com |_geeksanonymous |_Foo |_Bar |_twelvesteps |_StepOne |_StepTwo
Bar Code Decoder In Visual C#.NET
Using Barcode Control SDK for VS .NET Control to generate, create, read, scan barcode image in VS .NET applications.
Scan GTIN - 12 In Visual Studio .NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in .NET applications.
This tree lists three directories,
Barcode Reader In VB.NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
UPC Symbol Printer In Java
Using Barcode encoder for Android Control to generate, create UPC A image in Android applications.
com geeksanonymous twelvesteps
Generate 2D Barcode In C#.NET
Using Barcode printer for .NET framework Control to generate, create Matrix Barcode image in .NET framework applications.
Printing Data Matrix ECC200 In Java
Using Barcode encoder for Android Control to generate, create Data Matrix image in Android applications.
and four classes:
com.geeksanonymous.Foo com.geeksanonymous.Bar com.geeksanonymous.twelvesteps.StepOne com.geeksanonymous.twelvesteps.StepTwo
The subpackage of com.geeksanonymous is the twelvesteps package. Remember that in Java, the com.geeksanonymous.twelvesteps package is treated as a completely distinct package that has no relationship with the packages above it (in this example, the com.geeksanonymous package), except they just happen to share a couple of directories. Table 4-4 lists examples of command-line switches for enabling and disabling assertions.
Working with the Assertion Mechanism (Exam Objectives 2.4 and 2.5)
TABLE 4-4
Assertion Command-Line Switches
Command-Line Example java -ea java -enableassertions java -da java -disableassertions java -ea:com.foo.Bar java -ea:com.foo java -ea -dsa java -ea -da:com.foo
What It Means Enable assertions Disable assertions (the default behavior of version 1.4) Enable assertions in class com.foo.Bar Enable assertions in package com.foo, and any of its subpackages Enable assertions in general, but disable assertions in system classes Enable assertions in general, but disable assertions in package com.foo and any of its subpackages
Using Assertions Appropriately
Not all legal uses of assertions are considered appropriate. As with so much of Java, you can abuse the intended use for assertions, despite the best efforts of Sun s Java engineers to discourage you. For example, you re never supposed to handle an assertion failure. That means don t catch it with a catch clause and attempt to recover. Legally, however, AssertionError is a subclass of Throwable, so it can be caught. But just don t do it! If you re going to try to recover from something, it should be an exception. To discourage you from trying to substitute an assertion for an exception, the AssertionError doesn t provide access to the object that generated it. All you get is the String message. So who gets to decide what is and is not appropriate Sun. Both the exam and this section use Sun s official assertion documentation to determine appropriate and inappropriate uses.
If you see the word appropriate on the exam, do not mistake that for legal. Appropriate always refers to the way in which something is supposed to be used, according to either the developers of the mechanism or best practices officially embraced by Sun. If you see the word correct in the context of assertions, as in, Line 3 is a correct use of assertions, you should also assume that correct is referring to how assertions should be used rather than how they legally could be used.
4: Flow Control, Exceptions, and Assertions
Do not use assertions to validate arguments to a public method.
The following is an inappropriate use of assertions:
public void doStuff(int x) { assert (x > 0); // do things with x }
A public method might be called from code that you don t control (or have ever seen). Because public methods are part of your exposed interface to the outside world, you re supposed to guarantee that any constraints on the arguments will be enforced by the method itself. But since assertions aren t guaranteed to actually run (they re typically disabled in a deployed application), the enforcement won t happen if assertions aren t enabled. You don t want publicly accessible code that works only conditionally, depending on whether assertions are enabled or disabled. If you need to validate public method arguments, you ll probably use exceptions to throw, say, an IllegalArgumentException if the values passed to the public method are invalid.
Copyright © OnBarcode.com . All rights reserved.