Kelas Penyesuai Java

Kelas Penyesuai di Java bukanlah perkara baharu. Ia digunakan untuk menyediakan pelaksanaan antara muka Pendengar. Kelebihan kelas penyesuai ialah ia menyimpan kod. Jika kami mewarisi kelas penyesuai menggunakan antara muka Penyesuai, kami tidak akan dipaksa untuk melaksanakan semua kaedah antara muka pendengar. Terdapat tiga pakej di mana kelas penyesuai Java ditemui. Tiga pakej tersebut ialah:

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• java.awt. acara
• java.awt. dnd
• java.swing. acara

Selain itu, kelebihan lain Kelas Penyesuai ialah ia berguna apabila kita ingin memproses beberapa acara yang dikendalikan oleh antara muka pendengar acara tertentu.

Menggunakan Kelas Penyesuai dalam Java dengan Sintaks

Seperti yang kita perhatikan dalam pengenalan, terdapat tiga pakej di mana kita mencari kelas penyesuai. Kami kini akan melihat antara muka Pendengar yang sepadan bagi kelas penyesuai masing-masing dalam ketiga-tiga pakej.

• java.awt. Kelas Penyesuai acara
• Kelas Penyesuai java.awt.dnd
• jawa.ayun. Kelas Penyesuai acara

1. java.awt. Kelas Penyesuai acara

Di bawah ialah beberapa kelas Penyesuai dan antara muka pendengar yang sepadan. Ini terdapat dalam Kit Alat Tetingkap Abstrak bagi pakej Java.

Adapter Class	Listener Interface
WindowAdapter	WindowListener
KeyAdapter	KeyListener
MouseAdapter	MouseListener
MouseMotionAdapter	MouseMotionListener
FocusAdapter	FocusListener
ComponentAdapter	ComponentListener
ContainerAdapter	ContainerListener
HierarchyBoundsAdapter	HierarchyBoundsListener

Kelas Penyesuai

Antara Muka Pendengar

Penyesuai Tetingkap

WindowListener

KeyAdapter

KeyListener

Penyesuai Tetikus

Pendengar Tetikus

MouseMotionAdapter

MouseMotionListener

FocusAdapter

FocusListener

ComponentAdapter

ComponentListener

ContainerAdapter

ContainerListener

HierarchyBoundsAdapter

HierarchyBoundsListener

Kelas Penyesuai Tetingkap Kod di bawah memberikan sintaks Kelas Penyesuai, dan ia memberi kita idea tentang rupa WindowAdapter Class dan sintaksnya.

AdapterExample()
{
f=new Frame("Hello World");
f.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e)
{
f.close();
}
}

Sintaks:

Kelas Penyesuai Kunci

Kod di bawah memberikan sintaks Kelas KeyAdapter.

public abstract keyAdapter Class
extends Object
Implements KeyListener

Sintaks:

Kelas Penyesuai Tetikus

Kod di bawah memberikan sintaks Kelas MouseAdapter.

MouseAdapterExample()
{
f=new Frame("Mouse Adapter");
f.addMouseListener(this);
f.setSize(100,100);
f.setLayout(null);
f.setVisible(false);
}

Sintaks:

Kelas Penyesuai MouseMotion

Kod di bawah memberikan sintaks Kelas 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);
}

Sintaks:

Kelas Penyesuai Fokus

Kod di bawah memberikan sintaks kelas FocusAdapter.

public abstract class FocusAdapter
extends Object
Implements FocusListener

Sintaks:

Kelas Penyesuai Komponen

Kod di bawah memberikan sintaks kelas 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);
}
}

Sintaks:

Kelas Penyesuai Bekas

Kod di bawah memberikan sintaks Kelas ContainerAdapter.

public abstract class ContainerAdapter
extends Object
implements ContainerListener

Sintaks:

Kelas Penyesuai HierarkiBounds

Kod di bawah memberikan sintaks kelas HierarchyBoundsAdapter.

public abstract class HierarchyBoundsAdapter
extends Object
implements HierarchyBoundsListener 

Sintaks:

Adapter Class	Listener Interface
DragSourceAdapter	DragSourceListener
DragTargetAdapter	DragTargetListener

2. Kelas Penyesuai java.awt.dnd Di bawah ialah beberapa kelas penyesuai yang digunakan dalam pakej awt.dnd. Mereka disenaraikan dalam jadual.

Kelas Penyesuai	Antara Muka Pendengar
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.

DragSourceAdapter Class

The below code gives the syntax of the DragSourceAdapter class.

Syntax:

public abstract class DragSourceAdapter
extends Object
implements DragSourceAdapterListener

DragTargetAdapter Class

The below code gives the syntax of the DragTargetAdapter class.

Syntax:

public abstract class DragTargetAdapter
extends Object
implements DragTargetAdapterListener

3. java.swing. event Adapter Classes

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.

MouseInputAdapter Class

Below is the code which provides the syntax of the MouseInputAdapter class.

Syntax:

public abstract class MouseInputAdapter
extends MouseAdapter
implements MouseInputListener

InternalFrameAdapter Class

Below is the code which provides the syntax of the InternalFrameAdapter class.

Syntax:

public abstract class InternalFrameAdapter
extends Object
implements InternalFrameListener

Explanation

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.

Conclusion

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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