Often you need to call a method on an object and check some property. For example, you might need to check whether the USB port is a particular version. To do this in a safe way, you first need to check whether
A fourth method, showInputDialog, is designed to display a modal dialog that gets a string from the user, using either a text field, an uneditable combo box or a list. Here are some examples, taken from DialogDemo.java, of using showMessageDialog, showOptionDialog, and the JOptionPane ...
We inform the control that the event should be handled by a method named txtBoxEmpty_Validating(). We also need a way to know the state of our controls. For this purpose, we use the Tag property of the text boxes. If you recall the discussion of this property earlier in the chapter,...
This is another example of strengthening the preconditions of a subtype and will result in a ConstraintDeclarationException. 22.4.1 Rules for Using Method Constraints in Type Hierarchies The following rules define how method validation constraints should be used in type hierarchies. Do not add method...
The UIXTable class is the base abstraction for the table components provided by ADF Faces and SortableModel is a JSF data model for the ADF Faces table components. The getTableModel() method calls refreshAction() , which retrieves all subscribers from the database using the selectAll() DAO...
Starting with .NET 7, you can easily run any .NET method from JavaScript without needing the whole Blazor framework. Let's see how to run a .NET method from JavaScript. Improve Blazor startup process UX - January 21, 2023 - You can do a lot of things with Blazor: PWA, SSR, SPA, ...
Creating a 'marker' class in the package with no functionality and passing to this method is a good way of preventing breaking the preloading as classes are moved around.withConfigurationFile: Whilst mapping information from POJOs via annotations is efficient and has the mapping code inline with ...
The static methodLong.hashCodewas introduced in Java 8. So if we suggest it when the user’s project is configured to use Java 7 or older, there will be a compilation error. The inspection should not suggest anything on code older than Java 8. ...
Another important difference is that the Enumeration interface does not provide a method for restarting the traversal. One advantage of .NET enumerators is that you can access the current element multiple times. On the other hand, Java enumerators allow you to check multiple times for completion, ...
This class can be used to get a map, and to put or get data in a map. You cannot create a map explicitly, but if you get a map that does not exist, the map is created automatically. When you get a global map from an external grid, the getGlobalMap method makes a connection to...