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设计模式（3）builder

news 2025/7/3 16:24:16

需求：对于复杂的对象，我们只需要通过设置一些参数，就可以得到相对应的实例。

简单来说，需求就是用一个类通过方法返回一个新建的对象，而且可以通过方法去设置这个对象

public interface CarBuilder {void setCarName(String name);void setCarModel(String model);Car getCar();
}

这个类有一个内部私有 car，通过getCar ，输出 car的实例。

package com.example.builder;public class CarBuilderImp implements CarBuilder {private Car car = new Car ();@Overridepublic void setCarName( String name) {car.setName(name);}@Overridepublic void setCarModel(String model) {car.setModel( model);}@Overridepublic Car getCar() {return car;}
}

package com.example.builder;import android.util.Log;import androidx.annotation.NonNull;public class Car {String name;String model;public void setName(String name) {this.name = name;}public void setModel(String model) {this.model = model;}public String getName() {return name;}public String getModel() {return model;}@NonNull@Overridepublic String toString() {Log.d("Car"+"LIU","name = " + this.name + "model = " + this.model);return this.name + this.model;}}

example

        CarBuilderImp carBuilderImp = new CarBuilderImp();carBuilderImp.setCarModel("X1");carBuilderImp.setCarName("BMW");Car car = carBuilderImp.getCar();2024-10-05 11:53:36.966 18346-18346/com.example.builder D/CarLIU: name = BMWmodel = X1

参考：百度安全验证

https://github.com/youlookwhat/DesignPattern#11-%E5%BB%BA%E9%80%A0%E8%80%85%E6%A8%A1%E5%BC%8F

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