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Beginning with JDK 14, a new feature has been incorporated into the exception subsystem: chained exceptions The chained exception feature allows you to associate another exception with an exception This second exception describes the cause of the first exception For example, imagine a situation in which a method throws an ArithmeticException because of an attempt to divide by zero However, the actual cause of the problem was that an I/O error occurred, which caused the divisor to be set improperly Although the method must certainly throw an ArithmeticException, since that is the error that occurred, you might also want to let the calling code know that the underlying cause was an I/O error Chained exceptions let you handle this, and any other situation in which layers of exceptions exist To allow chained exceptions, two constructors and two methods were added to Throwable The constructors are shown here: Throwable(Throwable causeExc) Throwable(String msg, Throwable causeExc) In the first form, causeExc is the exception that causes the current exception That is, causeExc is the underlying reason that an exception occurred The second form allows you to specify a description at the same time that you specify a cause exception These two constructors have also been added to the Error, Exception, and RuntimeException classes The chained exception methods added to Throwable are getCause( ) and initCause( ) These methods are shown in Table 10-3 and are repeated here for the sake of discussion Throwable getCause( ) Throwable initCause(Throwable causeExc) The getCause( ) method returns the exception that underlies the current exception If there is no underlying exception, null is returned The initCause( ) method associates causeExc with the invoking exception and returns a reference to the exception Thus, you can associate a cause with an exception after the exception has been created However, the cause exception can be set only once Thus, you can call initCause( ) only once for each exception object Furthermore, if the cause exception was set by a constructor, then you can t set it again using initCause( ) In general, initCause( ) is used to set a cause for legacy exception classes that don t support the two additional constructors described earlier Here is an example that illustrates the mechanics of handling chained exceptions:. vb.net ean 13 reader .NET EAN - 13 Barcode Reader for C#, VB . NET , ASP.NET Applications
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NET EAN - 13 Barcode Reader , Reading EAN - 13 barcode images in .NET, C#, VB . NET , ASP.NET applications. Once the ResultSet metadata is retrieved, the J2ME application can call methods of the ResultSetMetaData object to retrieve specific kinds of metadata The more commonly called methods are getColumnCount() Returns the number of columns contained in the ResultSet Returns the name of the column specified by Returns the data type of the column specified getColumnName(int number) the column number getColumnType(int number) by the column number In this version, the names sqrt and pow are brought into view by these static import statements: import static javalangMathsqrt; import static javalangMathpow; site map, 371 table of contents, 372 search capabilities, 372 frequently asked questions (FAQ), 373 named anchor, 373 There are many other methods used to retrieve practically any information you need to know about a database and the ResultSet many more methods than can fit in this chapter You can obtain detailed information about each of these methods by visiting Sun s web site, javasuncom After these statements, it is no longer necessary to qualify sqrt( ) or pow( ) with their class name Therefore, the hypotenuse calculation can more conveniently be specified, as shown here: frame, 380 frameset, 380 hypot = sqrt(pow(side1, 2) + pow(side2, 2)); vb.net ean 13 reader EAN - 13 VB . NET DLL - KeepAutomation.com
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NET. Free demo download. How to read, scan EAN - 13 linear barcode image in . NET applications ... High-quality barcode reader ; C#, VB . NET sample code ... The setXXX() and getXXX() methods are used throughout this chapter to set a value of a specific data type and to retrieve a value of a specific data type The XXX in the name of these methods is replaced with the name of the data type Table 10-1 contains a list of data types and their Java equivalents You can use this list to determine the proper data name to replace the XXX in the two methods As you can see, this form is considerably more readable There are two general forms of the import static statement The first, which is used by the preceding example, brings into view a single name Its general form is shown here: import static pkgtype-namestatic-member-name; Here, type-name is the name of a class or interface that contains the desired static member Its full package name is specified by pkg The name of the member is specified by static-member-name The second form of static import imports all static members of a given class or interface Its general form is shown here: import static pkgtype-name*; If you will be using many static methods or fields defined by a class, then this form lets you bring them into view without having to specify each individually Therefore, the preceding program could have used this single import statement to bring both pow( ) and sqrt( ) (and all other static members of Math) into view: information by category Search capabilities allow visitors to access site information by searching for a word or phrase A FAQ page provides answers to common questions about the site Named anchors enable visitors to jump to marked locations within a page or a separate document import static javalangMath*; CHAR VARCHAR LONGVARCHAR NUMERIC DECIMAL BIT TINYINT SMALLINT INTEGER BIGINT REAL Table 10-1 Of course, static import is not limited just to the Math class or just to methods For example, this brings the static field Systemout into view: vb.net ean 13 reader VB . NET Image: VB Code to Read and Recognize EAN - 13 Barcode from ...
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