01.创建型————简单工厂模式

package Create.a.SimpleFactory;

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

package Create.a.SimpleFactory;

//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.a.SimpleFactory;

//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.a.SimpleFactory;


//工厂类
public class SimpleFactory {
        
	public static Salary createSalary(String name){
		if(name.equals("HeBei")){
			return new HeBeiSalary();
		}
		if(name.equals("GD")){
			return new GuangDongSalary();
		}
		return null;
		
	}
    

}


如果后期需求需要变更时，即需要变动if条件内容

package Create.a.SimpleFactory;

//业务调用类
public class Client {
	public static void main(String[] args) {
		Salary sa = SimpleFactory.createSalary("HeBei");
		sa.calcSalary();
		sa = SimpleFactory.createSalary("GD");
		sa.calcSalary();
	}
}