04.创建型————创建者模式

package Create.d.Builder;

//业务接口
public interface Tax {
	void calcTax();
}

　　

package Create.d.Builder;

//业务接口
public interface Salary {
	void calcSalary();
}

　　

package Create.d.Builder;

//业务实现类
public class HeBeiTax implements Tax {

	@Override
	public void calcTax() {
		// TODO Auto-generated method stub
		System.out.println("开始计算河北子公司的税收！");
	}

}

　　

package Create.d.Builder;

//业务实现类
public class HeBeiSalary implements Salary {

	@Override
	public void calcSalary() {
		// TODO Auto-generated method stub
		System.out.println("开始计算河北子公司的薪资！");
	}

}

　　

package Create.d.Builder;

//业务实现类
public class GuangDongTax implements Tax {

	@Override
	public void calcTax() {
		// TODO Auto-generated method stub
		System.out.println("开始计算广东子公司的税收!");
	}

}

　　

package Create.d.Builder;

//业务实现类
public class GuangDongSalary implements Salary {

	@Override
	public void calcSalary() {
		// TODO Auto-generated method stub
		System.out.println("开始计算广东子公司的薪资!");
	}

}

　　

package Create.d.Builder;

//工厂接口
public interface Factory {
  Salary createSalary();
  Tax createTax();
}

　　

package Create.d.Builder;

//业务实现类工厂类
public class HeBeiFactory implements Factory {

	@Override
	public Salary createSalary() {
		// TODO Auto-generated method stub
		return new HeBeiSalary();
	}

	@Override
	public Tax createTax() {
		// TODO Auto-generated method stub
		return new HeBeiTax();
	}

}

　　

package Create.d.Builder;

//业务实现类工厂类
public class GuangDongFactory implements Factory {

	@Override
	public Salary createSalary() {
		// TODO Auto-generated method stub
		return new GuangDongSalary();
	}

	@Override
	public Tax createTax() {
		// TODO Auto-generated method stub
		return new GuangDongTax();
	}

}

　　

package Create.d.Builder;


//创建者类
public class Builder {
		Factory fa;
		public Builder() {
			super();
		}
		
		public Builder(Factory fa) {
			super();
			this.fa = fa;
		}
		
		//封装业务实现类调用
		public void build(){
			Salary sa = fa.createSalary();
			Tax tax = fa.createTax();
			sa.calcSalary();
			tax.calcTax();
		}
		
		
}

　　

package Create.d.Builder;

//业务调用类
public class Client {
public static void main(String[] args) {
	Builder builder = new Builder(new HeBeiFactory());
	builder.build();
	
	builder =  new Builder(new GuangDongFactory());
	builder.build();
	
	
}
}

　

优点：客户端不再负责对象的创建和组装，而是把这个任务交给具体的创建类和组装类，只负责对对象的调用。

缺点：　如果产品之间差异非常大，需要编写多个创建者类才能实现，此时应考虑使用同工厂模式一同使用，效果更好。