public interface CPU {
}

public class AmdCPU implements CPU{
    public AmdCPU() {
        System.out.println("this is AmdCPU");
    }
}

public class IntelCPU  implements CPU{
    public IntelCPU() {
        System.out.println("this is IntelCPU");
    }
}

public interface HardDisk {
}

public class SeagateHardDisk implements HardDisk {
    public SeagateHardDisk() {
        System.out.println("this is SeagateHardDisk");
    }
}

public class WdHardDisk implements HardDisk {
    public WdHardDisk() {
        System.out.println("this is WdHardDisk");
    }
}

public interface ComputerFactory {

    /**
     * 查看CPU
     * @return  CPU信息
     */
    CPU viewCPU();

    /**
     * 查看硬盤
     * @return  硬盤信息
     */
    HardDisk viewHardDisk();

}


public class DellComputerFactory implements ComputerFactory {
    @Override
    public CPU viewCPU() {
        return new IntelCPU();
    }

    @Override
    public HardDisk viewHardDisk() {
        return new SeagateHardDisk();
    }
}

public class LenovoComputerFactory implements ComputerFactory {
    @Override
    public CPU viewCPU() {
        return new AmdCPU();
    }

    @Override
    public HardDisk viewHardDisk() {
        return new WdHardDisk();
    }
}

public class Client {
    public static void main(String[] args) {
        ComputerFactory computer = new DellComputerFactory();
        computer.viewCPU();
        computer.viewHardDisk();
        computer = new LenovoComputerFactory();
        computer.viewCPU();
        computer.viewHardDisk();
    }
}

　　輸出

this is IntelCPU
this is SeagateHardDisk
this is AmdCPU
this is WdHardDisk

設計模式 - 抽象工廠模式