What are the different Behavioural patterns?
There are 12 types of behavioral design patterns: Chain of Responsibility Pattern. Iterator Pattern. Mediator Pattern. Memento Pattern.
What are the different types of methods in WindowListener?
Methods of WindowListener interface
- public abstract void windowActivated(WindowEvent e);
- public abstract void windowClosed(WindowEvent e);
- public abstract void windowClosing(WindowEvent e);
- public abstract void windowDeactivated(WindowEvent e);
- public abstract void windowDeiconified(WindowEvent e);
What is WindowListener in Java?
public interface WindowListener extends EventListener. The listener interface for receiving window events. The class that is interested in processing a window event either implements this interface (and all the methods it contains) or extends the abstract WindowAdapter class (overriding only the methods of interest).
What are the three behavior patterns?
Behavioral class patterns use inheritance to distribute behavior between classes. The Template Method is the simpler and more common of the two….Designing Software.
| Lesson 6 | Three Types of Design Patterns: |
|---|---|
| Objective | Distinguish between Behavioral, Creational, and Structural Design Patterns. |
What is window Deiconified?
Iconifying means substituting a small icon on the desktop for the window deiconifying means the opposite. A window is activated if it or a component it contains has the keyboard focus; deactivation occurs when the window or one of its contents loses the keyboard focus.
Why Swing components are called lightweight components?
A Swing component is said to be a lightweight component because it written entirely in Java and does the high-level display work itself, rather than relying on code provided by your computer’s operating system.
What is Iconified in Java?
Called just after the listened-to window is iconified or deiconified, respectively. Called just after the listened-to window’s state is changed by being iconified, deiconified, maximized, or returned to normal. The state is available through the WindowEvent as a bitwise mask. The possible values, defined in java. awt.
How do you implement a listener?
Here are the steps.
- Define an Interface. This is in the child class that needs to communicate with some unknown parent.
- Create a Listener Setter. Add a private listener member variable and a public setter method to the child class.
- Trigger Listener Events.
- Implement the Listener Callbacks in the Parent.
What is Observer pattern used for?
Observer pattern is used when there is one-to-many relationship between objects such as if one object is modified, its depenedent objects are to be notified automatically. Observer pattern falls under behavioral pattern category.