设计模式——生成器模式

Posted 2020-11-10 神恰恰

这次来看下生成器模式，先来看下类图：

那么来说下特点吧：

1. 将一个复杂对象的创建过程封装起来
2. 允许对象通过多个步骤来创建，并且可以改变过程
3. 实现可以被替换
4. 隐藏了内部实现

来看下代码吧：

public abstract class AbstractCarBuilder {

    public Car car = new Car();

    public abstract AbstractCarBuilder builderName(String name);

    public abstract AbstractCarBuilder builderTire(String Tire);

    public abstract AbstractCarBuilder builderEngine(String Engine);

    public abstract AbstractCarBuilder builderChassis(String Chassis);

    public abstract Car getCar();
}

　　

public class Car {

    private String name;
    private String tire;
    private String engine;
    private String chassis;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getTire() {
        return tire;
    }

    public void setTire(String tire) {
        this.tire = tire;
    }

    public String getEngine() {
        return engine;
    }

    public void setEngine(String engine) {
        this.engine = engine;
    }

    public String getChassis() {
        return chassis;
    }

    public void setChassis(String chassis) {
        this.chassis = chassis;
    }

    @Override
    public String toString() {
        String car = name + "，" + tire + "，" + engine + "，" + chassis;
        return car;
    }
}

　　

public class CarBuilder extends AbstractCarBuilder {

    @Override
    public AbstractCarBuilder builderName(String name) {
        car.setName(name);
        return this;
    }

    @Override
    public AbstractCarBuilder builderTire(String Tire) {
        car.setTire(Tire);
        return this;
    }

    @Override
    public AbstractCarBuilder builderEngine(String Engine) {
        car.setEngine(Engine);
        return this;
    }

    @Override
    public AbstractCarBuilder builderChassis(String Chassis) {
        car.setChassis(Chassis);
        return this;
    }

    @Override
    public Car getCar() {
        return car;
    }
}