建造者模式

建造者模式

建造者模式（Builder Pattern）允许你逐步构建复杂的对象。这种模式将对象的构造过程与其表示分离，使得相同的构造过程可以创建不同的表示。建造者模式特别适用于需要创建具有多个部件或复杂配置的对象时。

使用建造者模式构造对象并完成链式调用：

需要创建的对象：

@Data
@ToString
public class Phone {
    String cpu;
    String mem;
    String disk;
    String camera;
}

抽象建造者类及其实现子类：

public abstract class AbstractPhoneBuilder {
    Phone phone;
    public abstract AbstractPhoneBuilder customCpu(String cpu);
    public abstract AbstractPhoneBuilder customMem(String mem);
    public abstract AbstractPhoneBuilder customDisk(String disk);
    public abstract AbstractPhoneBuilder customCamera(String camera);
    public Phone getPhone(){
        return this.phone;
    }
}

public class PhoneBuilder extends AbstractPhoneBuilder{
    public PhoneBuilder() {
        this.phone = new Phone();
    }

    @Override
    public AbstractPhoneBuilder customCpu(String cpu) {
        phone.setCpu(cpu);
        return this;
    }

    @Override
    public AbstractPhoneBuilder customMem(String mem) {
        phone.setMem(mem);
        return this;
    }

    @Override
    public AbstractPhoneBuilder customDisk(String disk) {
        phone.setDisk(disk);
        return this;
    }

    @Override
    public AbstractPhoneBuilder customCamera(String camera) {
        phone.setCamera(camera);
        return this;
    }
}

测试：

public class Main {
    public static void main(String[] args) {
        PhoneBuilder builder = new PhoneBuilder();
        Phone phone = builder.customCpu("晓龙999")
                .customMem("32g")
                .customDisk("1tb")
                .customCamera("1亿")
                .getPhone();
        System.out.println(phone);
    }
}