抽象工厂模式

抽象工厂模式在工厂模式的基础上又增加了一层抽象。将抽象工厂模式与工厂模式比较，很明显是添加了一个新的抽象层。抽象工厂是一个创建其他工厂的超级工厂。我们可以把它叫做“工厂的工厂”。
代码：
interface CPU {
    void process();
}
  
interface CPUFactory {
    CPU produceCPU();
}
  
class AMDFactory implements CPUFactory {
    public CPU produceCPU() {
        return new AMDCPU();
    }
}
  
class IntelFactory implements CPUFactory {
    public CPU produceCPU() {
        return new IntelCPU();
    }
}
  
class AMDCPU implements CPU {
    public void process() {
        System.out.println("AMD is processing...");
    }
}
  
class IntelCPU implements CPU {
    public void process() {
        System.out.println("Intel is processing...");
    }
}
  
class Computer {
    CPU cpu;
  
    public Computer(CPUFactory factory) {
        cpu = factory.produceCPU();
        cpu.process();
    }
}
  
public class Client {
    public static void main(String[] args) {
        new Computer(createSpecificFactory());
    }
  
    public static CPUFactory createSpecificFactory() {
        int sys = 0; // based on specific requirement
        if (sys == 0)
            return new AMDFactory();
        else
            return new IntelFactory();
    }
}