设计模式-抽象工厂模式

        在Java中，抽象工厂模式提供了一种方式，可以封装一组具有共同主题的工厂。以下是一个简单的Java实现：

// 抽象产品
interface Button {
    void paint();
}
 
interface GUIFactory {
    Button createButton();
}
 
// 具体产品
class WinButton implements Button {
    public void paint() {
        System.out.println("Windows Button");
    }
}
 
class OSXButton implements Button {
    public void paint() {
        System.out.println("OSX Button");
    }
}
 
// 具体工厂
class WinFactory implements GUIFactory {
    public Button createButton() {
        return new WinButton();
    }
}
 
class OSXFactory implements GUIFactory {
    public Button createButton() {
        return new OSXButton();
    }
}
 
// 客户端代码
public class Application {
    private GUIFactory factory;
    private Button button;
 
    public Application(GUIFactory factory) {
        this.factory = factory;
        this.button = factory.createButton();
    }
 
    public void paint() {
        button.paint();
    }
 
    public static void main(String[] args) {
        Application application;
 
        String osName = System.getProperty("os.name").toLowerCase();
        if (osName.contains("win")) {
            application = new Application(new WinFactory());
        } else {
            application = new Application(new OSXFactory());
        }
 
        application.paint();
    }
}

         在这个例子中，GUIFactory 是抽象工厂，WinFactory 和 OSXFactory 是它的具体实现。Button 是抽象产品，WinButton 和 OSXButton 是它的具体实现。客户端程序通过具体工厂创建具体产品。