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So far, you have only been catching exceptions that are thrown by the Java run-time system However, it is possible for your program to throw an exception explicitly, using the throw statement The general form of throw is shown here: throw ThrowableInstance; Here, ThrowableInstance must be an object of type Throwable or a subclass of Throwable Primitive types, such as int or char, as well as non-Throwable classes, such as String and Object, cannot be used as exceptions There are two ways you can obtain a Throwable object: using a parameter in a catch clause, or creating one with the new operator The flow of execution stops immediately after the throw statement; any subsequent statements are not executed The nearest enclosing try block is inspected to see if it has a catch statement that matches the type of exception If it does find a match, control is transferred to that statement If not, then the next enclosing try statement is inspected, and so on If no matching catch is found, then the default exception handler halts the program and prints the stack trace

While useful, frames-based pages can also cause problems for some viewers Following certain guidelines will help make your frames-based pages more user-friendly

Part I:

Listing 10-20 Using savepoints in a transaction String url = "jdbc:odbc:CustomerInformation"; String userID = "jim"; String password = "keogh"; Statement DataRequest1, DataRequest2 ; Connection Database; try { ClassforName( "sunjdbcodbcJdbcOdbcDriver"); Database = DriverManagergetConnection(url,userID,password); } catch (ClassNotFoundException error) { Systemerrprintln("Unable to load the JDBC/ODBC bridge" + error); Systemexit(1); } catch (SQLException error) { Systemerrprintln("Cannot connect to the database" + error); Systemexit(2);

Here is a sample program that creates and throws an exception The handler that catches the exception rethrows it to the outer handler

Size Guidelines In theory, you can create an unlimited number of frames on a page However, dividing the pages into many small segments can confuse visitors As you design your site, you should consider the number, placement, and size of the frames

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// Demonstrate throw class ThrowDemo { static void demoproc() { try { throw new NullPointerException("demo"); } catch(NullPointerException e) { Systemoutprintln("Caught inside demoproc"); throw e; // rethrow the exception } } public static void main(String args[]) { try { demoproc(); } catch(NullPointerException e) { Systemoutprintln("Recaught: " + e); } } }

} try { Database setAutoCommit(false) String query1 = "UPDATE Customers SET Street = '5 Main Street' " + "WHERE FirstName = 'Bob'"; String query2 = "UPDATE Customers SET Street = '10 Main Street' " + "WHERE FirstName = 'Tim'"; DataRequest1= DatabasecreateStatement(); Savepoint s1 = DatabasesetSavepoint ("sp1"); DataRequest2= DatabasecreateStatement(); DataRequestexecuteUpdate (query1); DataRequestexecuteUpdate (query2); Databasecommit(); DataRequest1close(); DataRequest2close(); DatabasereleaseSavepoint ("sp1"); Databaseclose(); } catch ( SQLException error ){ try { Databaserollback(sp1); } catch ( SQLException error ){ Systemerrprintln("rollback error" + errorgetMessage()); Systemexit(3); } Systemerrprintln("SQL error" + error getMessage());); Systemexit(4); }

This program gets two chances to deal with the same error First, main( ) sets up an exception context and then calls demoproc( ) The demoproc( ) method then sets up another exceptionhandling context and immediately throws a new instance of NullPointerException, which is caught on the next line The exception is then rethrown Here is the resulting output: Caught inside demoproc Recaught: javalangNullPointerException: demo The program also illustrates how to create one of Java s standard exception objects Pay close attention to this line:

On a site that contains a left and right frame, the Web designer usually defines the pixel width of the left frame The right frame takes up the remaining space on the page It is best not to define the pixel width of the right frame since monitor sizes and resolution vary On a site that contains a top and bottom frame, the designer assigns a pixel width to the top frame The bottom frame then fills the remaining space on the page

throw new NullPointerException("demo");

Another way to combine SQL statements into a transaction is to batch statements together into a single transaction and then execute the entire transaction You can do this by using the addBatch() method of the Statement object The addBatch() method receives an SQL statement as a parameter and places the SQL statement in the batch Once all the SQL statements that make up the transaction are included in the batch, the executeBatch() method is called to execute the entire batch at the same time The executeBatch() method returns an int array that contains the number of SQL statements executed successfully The int array is displayed if a BatchUpdateException error is thrown during the execution of the batch The batch can be cleared of SQL statements by using the clearBatch() method The transaction must be committed using the commit() method Make sure that setAutoCommit() is set to false before executing the batch, as discussed in the previous section

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