java barcode generator source code REVISITING THE CONNECTION TO THE INTERNET in Java


C H A PT E R 17
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@NamedQuery( name = "findUserWithNoItems", query = "SELECT distinct u FROM User u WHERE u.items is EMPTY", hints = {@QueryHint(name = "org.hibernate.fetchSize ", value = "50")} )
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Structs are value types, but they are similar to classes in that they can contain constructors, properties, methods, and fields, all explained in this chapter. Structs can also support operators and indexers (see 14). On the other hand, structs don t support inheritance or destructors (see 11) or field initialization. You define a struct almost exactly like you define a class:
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You can nest classes to any depth, but don t go overboard. Creating multiple classes within the same namespace will likely meet your needs without making the code overly complex. But that s just my idea; do what you want. It s your code after all. If you want to throw your life away on a career in the movies, that s fine with me. Adding a nice variety of members to a class is a lot of fun. You can add class members in any variety, in any order, and in any quantity. If you add a lot of members, you might even get a quantity discount on Visual Studio from Microsoft, but don t hold your breath.
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The beginning of our only global transformation rule
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Working with objects
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Other names for this method are copy(), copyimage(), clone(), and cloneimage().
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This code looks a lot like the previous code block, but with the added # signs. It looks the same but it s not. With the plain If statement, the following code gets compiled into the final application:
B Assign a functional subset of the data per shard. C This is the fully qualified class name of the IndexShardingStrategy implementation. D Assign one distributor id to a shard id. You can use the property-naming scheme of your choice. E The initialize
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#import "SKDatabase.h" #import "sqlite3.h" @implementation SKDatabase - (id)initWithFile:(NSString *)dbFile { self = [super init]; NSString *paths = [[NSBundle mainBundle] resourcePath]; NSString *path = [paths stringByAppendingPathComponent:dbFile]; int result = sqlite3_open([path UTF8String], &dbh); NSAssert1(SQLITE_OK == result, NSLocalizedStringFromTable (@"Unable to open the sqlite database (%@).", @"Database", @""), [NSString stringWithUTF8String:sqlite3_errmsg(dbh)]); return self; } - (void)close { if (dbh) { sqlite3_close(dbh); } } - (sqlite3 *)dbh { return dbh; } - (sqlite3_stmt *)prepare:(NSString *)sql { const char *utfsql = [sql UTF8String]; sqlite3_stmt *statement; if (sqlite3_prepare([self dbh],utfsql,-1,&statement,NULL)==SQLITE_OK) { return statement; } else { return 0; } } Looks up - (id)lookupSingularSQL:(NSString *)sql forType: SQL results (NSString *)rettype { sqlite3_stmt *statement; Calls prepare id result; function if (statement = [self prepare:sql]) { if (sqlite3_step(statement) == SQLITE_ROW) { if ([rettype compare:@"text"] == NSOrderedSame) { result = [NSString stringWithUTF8String: (char *)sqlite3_column_text (statement,0)]; } else if ([rettype compare:@"integer"] == NSOrderedSame) { result = (id)sqlite3_column_int (statement,0); } } } sqlite3_finalize(statement); return result; }
exception introduction pattern, vs. 335 SQLException, example of 361 syntax 137 declare warning 97 best practices, use in 190 example of 180 policy enforcement example of 186 transaction management example 374 decorator design pattern 246 default association instance creation transaction management example 382 default interface implementation 281 285 overriding 284 partial 284 multiple inheritance 284 providing, idiom 281 DefaultTableModel 196 DelegatingThread 226 implementation of 227 need for 226 delegation pattern 282 deployment policy enforcement 185 -deprecation ajc option 440 design bloat 6 limitations of techniques 6 realization in hindsight 5 design pattern definition of 246 idiom, difference 246 language specificity, and 246 object-oriented decorator 246 factory 246 visitor 246 problem scope, and 246 relationship with AOP 30 use in design phase 430 design phase AspectJ, using 428 core concern implementation 428
static void Main( ) { int temp = 32; if ( temp < 32 ) { Console.WriteLine( "Warning! Ice on road!" ); } else { if ( temp == 32 ) { Console.WriteLine("Temp exactly freezing, beware of water."); } else { Console.WriteLine("No ice; drive with confidence."); } } }
Solution to Question 4-7. The prefix operator increments (or decrements) the original value, and then assigns the new value to the result. The postfix operator assigns the original value to the result, and then increments (or decrements) the original value. Solution to Question 4-8. The expressions evaluate to: 1. True 2. True 3. False 4. 5 (This expression evaluates to 5, not to true; remember that assignment returns the value assigned) Solution to Question 4-9. The expressions evaluate to: 1. True. x > y is true, and y < x is also true, so the entire expression is true. 2. False. x > y is true, so !(x > y) is false. 3. True. x < y is false, so !(x < y) is true. !(x < y) is true, and (x > y) is also true, so the entire expression together is true. Note that the ! is evaluated before the &&. 4. True. This one is tricky, because of the nested parentheses, but if you take it one step at a time, you can work it out. (x > y) is true, and !(x < y) is also true, so ((x > y) || !(x < y)) all evaluates to true. The other side of the &&, (x > y), is also true, so you end up with true && true, which evaluates to true. As you can see, you need to be very careful how you nest your parentheses.
public class Tester { public Invoice WhichIsGreater(Invoice invoice1, Invoice invoice2) { if (invoice1 > invoice2) { return invoice1; } else { return invoice2; } } public void { Invoice Invoice Invoice Invoice Run( ) firstInvoice = new Invoice("TinyCorp", 399.65); secondInvoice = new Invoice("SuperMegaCo", 56389.53); thirdInvoice = new Invoice("SuperMegaCo", 399.65); tempInvoice;
Figure 18.4 The media player doesn t integrate music well.
know enough to get the job done, but the View knows about the Model only in very general terms. Let s consider a program for managing inventories. The Controller might provide the View with a function that returns a list of all product lines matching a given category ID, but the View knows nothing about how that list was derived. It may be that version 1 of this program stored the data used to generate the list in an array in memory or read it from a flat text file. With the second version of the program, there was a requirement to handle much larger datasets, and a relational database server was added to the architecture. The implications of this change on the Model would be significant, and a lot of code would need to be rewritten. Provided that the Controller could still deliver a list of product lines matching a category, the impact on the View code would be nil. Similarly, the engineers working on the View should be free to improve the usability of the application without worrying about breaking hidden assumptions in the Model, so long as they stick to a basic agreement on the interfaces with which the Controller provides them. By dividing the system into subsystems, MVC provides an insurance policy against minor changes rippling right across a codebase and allows the team behind each subsystem to respond quickly without treading on one another s toes. The MVC pattern is commonly applied to classic web application frameworks in a particular way, in order to serve up the succession of static pages that compose the interface. When an Ajax application is up and running and requesting data from the server, the mechanics of serving up the data are similar to those of a classic web app. Web server style MVC can also benefit Ajax applications, and because it s well understood, we ll start here and move on to other more Ajax-specific ways of working with MVC later. If you re new to web frameworks, this section should provide you with the information you need to understand how they can make an Ajax application more
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