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@Data
public static class Bike {
    private String frame;
    private String seat;
}

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public static abstract class Builder {
    protected Bike bike = new Bike();
    public abstract void buildFrame();
    public abstract void buildSeat();
    public abstract Bike createBike();
}

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public static class MobileBuilder extends Builder {
    @Override
    public void buildFrame() {
        bike.setFrame("碳纤维车架");
    }
    @Override
    public void buildSeat() {
        bike.setSeat("真皮车座");
    }
    @Override
    public Bike createBike() {
        return bike;
    }
}

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 public static class OfoBuilder extends Builder {
    @Override
    public void buildFrame() {
        bike.setFrame("铝合金车架");
    }
    @Override
    public void buildSeat() {
        bike.setSeat("橡胶车座");
    }
    @Override
    public Bike createBike() {
        return bike;
    }
}

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@Setter
@AllArgsConstructor
public static class Director {
    private Builder builder;

    public Bike construct() {
        builder.buildFrame();
        builder.buildSeat();
        return builder.createBike();
    }
}

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// 创建摩拜单车
MobileBuilder mobileBuilder = new MobileBuilder();
Director mobileDirector = new Director(mobileBuilder);
Bike mobile = mobileDirector.construct();

// 创建OFO单车
MobileBuilder ofoBuilder = new OfoBuilder();
Director ofoDirector = new Director(ofoBuilder);
Bike ofo = ofoDirector.construct();

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@Data
public static class Bike {
    private String frame;
    private String seat;
}

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public static abstract class Builder {
    protected Bike bike = new Bike();
    public abstract void buildFrame();
    public abstract void buildSeat();
    public abstract Bike createBike();
    public Bike construct() {
        this.buildFrame();
        this.buildSeat();
        return this.createBike();
    }
}

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public static class MobileBuilder extends Builder {
    @Override
    public void buildFrame() {
        bike.setFrame("碳纤维车架");
    }
    @Override
    public void buildSeat() {
        bike.setSeat("真皮车座");
    }
    @Override
    public Bike createBike() {
        return bike;
    }
}

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public static class OfoBuilder extends Builder {
    @Override
    public void buildFrame() {
        bike.setFrame("铝合金车架");
    }
    @Override
    public void buildSeat() {
        bike.setSeat("橡胶车座");
    }
    @Override
    public Bike createBike() {
        return bike;
    }
}

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// 创建摩拜单车
MobileBuilder mobileBuilder = new MobileBuilder();
Bike bike = mobileBuilder.construct();

// 创建OFO单车
MobileBuilder ofoBuilder = new OfoBuilder();
Bike ofo = ofoBuilder.construct();

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@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class Phone {
    private String cpu;
    private String screen;
}

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Phone phone = new Phone
      .Builder()
      .cpu("intel")
      .screen("三星")
      .build();
System.out.println(phone);

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@ToString
public class Phone {
    private String cpu;
    private String screen;

    private Phone(Builder builder) {
        cpu = builder.cpu;
        screen = builder.screen;
    }
    public String getCpu() {
        return cpu;
    }
    public void setCpu(String cpu) {
        this.cpu = cpu;
    }
    public String getScreen() {
        return screen;
    }
    public void setScreen(String screen) {
        this.screen = screen;
    }

    public static final class Builder {
        private String cpu;
        private String screen;

        public Builder() {
        }

        public Builder cpu(String val) {
            cpu = val;
            return this;
        }

        public Builder screen(String val) {
            screen = val;
            return this;
        }

        public Phone build() {
            return new Phone(this);
        }
    }

}