Maison >Java >javaDidacticiel >Classes d'adaptateur Java
Les classes d'adaptateur en Java n'ont rien de nouveau. Ils sont utilisés pour assurer l’implémentation des interfaces Listener. L’avantage de la classe adapter est qu’elle enregistre le code. Si nous héritons de la classe adapter en utilisant l'interface Adapter, nous ne serons pas obligés d'implémenter toutes les méthodes de l'interface d'écoute. Il existe notamment trois packages dans lesquels se trouvent les classes d'adaptateur Java. Les trois forfaits sont :
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En outre, un autre avantage de la classe Adapter est qu'elle est utile lorsque nous souhaitons traiter quelques-uns des événements gérés par une interface d'écoute d'événements particulière.
Comme nous l'avons remarqué en introduction, il existe trois packages où l'on retrouve les classes d'adaptateur. Nous allons maintenant voir l'interface Listener correspondante des classes d'adaptateur respectives dans les trois packages.
Vous trouverez ci-dessous quelques-unes des classes Adapter et leur interface d'écoute correspondante. Ceux-ci sont présents dans le Abstract Window Toolkit du package Java.
Adapter Class |
Listener Interface |
WindowAdapter | WindowListener |
KeyAdapter | KeyListener |
MouseAdapter | MouseListener |
MouseMotionAdapter | MouseMotionListener |
FocusAdapter | FocusListener |
ComponentAdapter | ComponentListener |
ContainerAdapter | ContainerListener |
HierarchyBoundsAdapter | HierarchyBoundsListener |
Interface d'écoute
AdapterExample() { f=new Frame("Hello World"); f.addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) { f.close(); } }Syntaxe :
Classe KeyAdapter
Le code ci-dessous donne la syntaxe de la classe KeyAdapter.public abstract keyAdapter Class extends Object Implements KeyListenerSyntaxe :
Classe MouseAdapter
Le code ci-dessous donne la syntaxe de la classe MouseAdapter.MouseAdapterExample() { f=new Frame("Mouse Adapter"); f.addMouseListener(this); f.setSize(100,100); f.setLayout(null); f.setVisible(false); }Syntaxe :
Classe MouseMotionAdapter
Le code ci-dessous donne la syntaxe de la classe MouseMotionAdapter.MouseMotionAdapterExample() { f=new Frame("Adapter for Mouse Motion"); f.addMouseMotionListener(this); f.setSize(100,100); f.setLayout(null); f.setVisible(false); } public void mouseDragged(MouseEvent e) { Graphics g=f.getGraphics(); g.setColor(Color.ORANGE); g.fillOval(e.getX(),e.getY(),20,20); }Syntaxe :
Classe FocusAdapter
Le code ci-dessous donne la syntaxe de la classe FocusAdapter.public abstract class FocusAdapter extends Object Implements FocusListenerSyntaxe :
Classe ComponentAdapter
Le code ci-dessous donne la syntaxe de la classe ComponentAdapter.class MyAdapter extends ComponentAdapter { public void componentMoved(ComponentEvent e) { int a = e.getComponent().getX(); int b = e.getComponent().getY(); System.out.println("Value of X " + a); System.out.println("Value of Y: " + b); } }Syntaxe :
Classe ContainerAdapter
Le code ci-dessous donne la syntaxe de la classe ContainerAdapter.public abstract class ContainerAdapter extends Object implements ContainerListenerSyntaxe :
Classe HierarchyBoundsAdapter
Le code ci-dessous donne la syntaxe de la classe HierarchyBoundsAdapter.public abstract class HierarchyBoundsAdapter extends Object implements HierarchyBoundsListenerSyntaxe :
Adapter Class | Listener Interface |
DragSourceAdapter | DragSourceListener |
DragTargetAdapter | DragTargetListener |
In this case, there are two Adapter classes under the respective package, which is called. We will see the syntax of the two Adapter classes and study the codes under the respective package.
The below code gives the syntax of the DragSourceAdapter class.
Syntax:
public abstract class DragSourceAdapter extends Object implements DragSourceAdapterListener
The below code gives the syntax of the DragTargetAdapter class.
Syntax:
public abstract class DragTargetAdapter extends Object implements DragTargetAdapterListener
Below are some of the classes which are used in the swing. event package. They are listed down in a table.
Adapter Class | Listener Interface |
MouseInputAdapter | MouseInputListener |
InternalFrameAdapter | InternalFrameListener |
In this case, we notice two adapter classes along with their Listener Interface. The package javax. swing. event has two adapter classes which are respectively listed down in the table.
Below is the code which provides the syntax of the MouseInputAdapter class.
Syntax:
public abstract class MouseInputAdapter extends MouseAdapter implements MouseInputListener
Below is the code which provides the syntax of the InternalFrameAdapter class.
Syntax:
public abstract class InternalFrameAdapter extends Object implements InternalFrameListener
Adapter Classes are basically used in the case when the class is declared as abstract. Only the working is based on different functionalities, including the working of the Java classes, which are part of different Java packages. There are three packages in Java that have different Adapter classes and Listener Interfaces along with them. Adapter Classes are used in numerous cases where servers are used, and there is connectivity with the SQL database.
There are different functionalities, and mostly all of them are being used in Android programming as well. Adapter Classes are well-known functionality in Java programming, which helps coders get the idea of many applications that can be used via Swing methodology. There are many ideas that can be put forward to develop the Adapter Class methodology in Java. Loops can also be incorporated to develop some other types of functionality.
In this article, we see the working, and we see that there are three main packages that contain the adapter classes. We see the syntax of all the adapter classes which are present, as well as some of the codes of the working, are also provided. Adapter classes are basically unique in Java, and they are part of Swing functionality in Java.
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