public interface Computer {
    /**
     * 描述
     */
    String description();

    /**
     * 价格
     */
    double price();

}

public class AppleComputer implements Computer{
    @Override
    public String description() {
        return "苹果电脑";
    }

    @Override
    public double price() {
        return 10000;
    }
}

public abstract class AbstractComputer implements Computer{

    private Computer computer;

    public AbstractComputer(Computer computer) {
        this.computer = computer;
    }

    @Override
    public String description() {
        return this.computer.description();
    }

    @Override
    public double price() {
        return this.computer.price();
    }
}

public class KeyboardComputer extends AbstractComputer{

    public KeyboardComputer(Computer computer) {
        super(computer);
    }

    @Override
    public double price() {
        return super.price() + 20;
    }

    @Override
    public String description() {
        return super.description() + " + 键盘";
    }
}
public class MouseComputer extends AbstractComputer{

    public MouseComputer(Computer computer) {
        super(computer);
    }

    @Override
    public double price() {
        return super.price() + 10;
    }

    @Override
    public String description() {
        return super.description() + " + 鼠标";
    }
}

public class App {
    public static void main(String[] args) {
        Computer computer = new AppleComputer();
        System.out.println(computer.description() + " " + computer.price());
        computer = new KeyboardComputer(computer);
        System.out.println(computer.description() + " " + computer.price());
        computer = new MouseComputer(computer);
        System.out.println(computer.description() + " " + computer.price());
    }
}