抽象工厂模式 AbstractFactory

Abstract Factory模式中将具体的Product封装在具体Factory实现中，而客户仍只要面对Factory与Product的抽象介面，避免依赖于具 体的Factory与Product，由于Factory封装了所必须的Product，所以要更换掉所有的元件，只要简单的抽换掉Factory就可以 了，不用修改客户端的程式。

Java代码


/**

* @author Jerval

* @date 2011-4-23

*/

public interface IButton {

public void drawButton();

}

/**

* @author Jerval

* @date 2011-4-23

*/

public interface ILabel {

public void drawLabel();

}

/**

* @author Jerval

* @date 2011-4-23

*/

public class XpButton implements IButton {

@Override

public void drawButton() {

System.out.println("draw xp button....");

}

}

/**

* @author Jerval

* @date 2011-4-23

*/

public class XpLabel implements ILabel {

@Override

public void drawLabel() {

System.out.println("draw xp label...");

}

}

/**

* @author Jerval

* @date 2011-4-23

*/

public class VistaButton implements IButton {

@Override

public void drawButton() {

System.out.println("draw vista button....");

}

}

/**

* @author Jerval

* @date 2011-4-23

*/

public class VistaLabel implements ILabel {

@Override

public void drawLabel() {

System.out.println("draw vista label...");

}

}

/**

* @author Jerval

* @date 2011-4-23

*/

public interface IStyleFactory {

public IButton getButton();

public ILabel getlILabel();

}

/**

* @author Jerval

* @date 2011-4-23

*/

public class XpStyleFactory implements IStyleFactory{

@Override

public IButton getButton() {

return new XpButton();

}

@Override

public ILabel getlILabel() {

return new XpLabel();

}

}

/**

* @author Jerval

* @date 2011-4-23

*/

public class VistaStyleFactory implements IStyleFactory{

@Override

public IButton getButton() {

return new VistaButton();

}

@Override

public ILabel getlILabel() {

return new VistaLabel();

}

}

/**

* @author Jerval

* @date 2011-4-23

*/

public class CustomMsgBox {

private IButton button;

private ILabel label;

public CustomMsgBox(IStyleFactory styleFactory) {

setStyleFactory(styleFactory);

}

// 客户端依赖于抽象工厂，更换工厂不需要改动客户端

public void setStyleFactory(IStyleFactory styleFactory) {

setButton(styleFactory.getButton());

setLabel(styleFactory.getlILabel());

}

// 依赖抽象，改变了元件实例客户端代码也不用更改

public void setButton(IButton button) {

this.button = button;

}

public void setLabel(ILabel label) {

this.label = label;

}

public void show() {

drawCustomMsgBox();

button.drawButton();

label.drawLabel();

}

private void drawCustomMsgBox() {

System.out.println("draw CustomMsgBox...");

}

}

/**

* @author Jerval

* @date 2011-4-23

*/

public class MainClass {

public static void main(String[] args) {

//show xp style msgBox

CustomMsgBox xpStyleMsgBox = new CustomMsgBox(new XpStyleFactory());

xpStyleMsgBox.show();

//show vista style msgBox

CustomMsgBox vistaStyleMsgBox = new CustomMsgBox(new VistaStyleFactory());

vistaStyleMsgBox.show();

}

}