gui--graphical user Interface GUI. Introduction:
AWT is the first GUI class library package in the Java language. Java is a platform-independent programming language, but the GUI is often dependent on a specific platform, Java uses the appropriate technology to enable AWT to provide applications independent of the Machine platform interface, which ensures that the
same program's GUI on different machines run with a similar look (not necessarily exactly the same).
Mind Mapping:
Content Description:
- User interface Components
Component & Container container is a subclass of component, itself a component. component cannot be displayed independently and must be placed in the container. container adds component, including container objects, through the Add method.
Window&panel Window : Top-level windows that can be displayed directly. panel: Accommodates other component objects, but cannot be displayed independently and must be added to the window (Frame).
Create a frame:new frame (), or customize a class to inherit the frameto create a frame with a panel: Frame f =new Frame ("Java Frame with Panel"); Panel p = new Panel (null);
F.add (P);//The Panel must be added to the frame
when you use the Layout manager, it manages the size and location of the component. If the user wants to set it up, setlayout (NULL) is requiredWhen a panel is added to a frame, the panel can still have its own layout manager
Application scenario: in short, it is a method that is not determined at the moment of invocation, and is executed only when it waits for a situation to occur. A situation occurs on behalf of an event.
principle: Event Source: The object that generated the event, such as clicking a button, which is the event sourceEvent object: Encapsulates the information of the event, such as: You can determine that the button you pressed is the OK button, not the Cancel button. Listener (event handler): The method that is called when an event occurs.
process: registers the listener in the listener list of the event source object, notifies the listener when a state of the event source changes, and the listener executes its own handler.
Common Listening interface: ActionListenerKeyListenerMouseListenerWindowListener
Monitoring Interface & Monitor Adapter the adapter implements a listening interface. custom listeners can implement interfaces, or they can inherit adapters. The former needs to implement all the interface methods, the latter only need to rewrite their own methods.
establishment of relationships between listeners and event source objects: Inner classhold the other referenceAnonymous Class
- Graphics and imaging tools
GraphicsPaint and repaint
Javagui--awt
