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  • 面向接口编程 对象的三种依赖

    面向接口编程 --对象的三种依赖

    模块间的依赖通过抽象来发生,实现类之间不应该有直接的依赖关系,依赖关系通过接口或抽象类来产生, 即面向接口编程。通过面向接口编程,当业务逻辑发生变化时,只需要修改业务场景的客户端调用类,不要修改低层的模块,降低维护成本,减少风险产生。

     

    接口依赖注入:

    驾驶员接口及实现类

    public interface IDriver {

     public void driver(ICar car);

    }

     

    public class Driver  implements IDriver{

     

        @Override

        public void driver(ICar car) {

            // TODO Auto-generated method stub

            car.running();

        }

     

    }

    汽车接口及实现类

    public interface ICar {

       public void running();

    }

     

    public class BMW implements ICar {

     

        @Override

        public void running() {

            // TODO Auto-generated method stub

            System.out.println("宝马行驶..");

        }

    }

    public class Benz implements ICar {

     

        @Override

        public void running() {

            // TODO Auto-generated method stub

            System.out.println("奔驰行驶..");

        }

     

    }

    场景客户端调用

    public class Benz implements ICar{

     

        @Override

        public void running() {

            // TODO Auto-generated method stub

            System.out.println("奔驰行驶");

        }

     

    }

    构造器依赖注入:

    驾驶员接口及实现类

    public interface IDriver {

        public void drive();

    }

     

    public class Driver  implements IDriver{

     

        

        private ICar car;

        

        public Driver(ICar _car) {

            this.car = _car;

        }

     

        @Override

        public void drive() {

            // TODO Auto-generated method stub

            car.running();

        }

     

    }

    汽车接口及实现类

    public interface ICar {

       public void running();

    }

     

    public class BMW implements ICar {

     

        @Override

        public void running() {

            // TODO Auto-generated method stub

            System.out.println("宝马行驶..");

        }

    }

    public class Benz implements ICar {

     

        @Override

        public void running() {

            // TODO Auto-generated method stub

            System.out.println("奔驰行驶..");

        }

     

    }

    场景客户端调用

    public class Client {

        public static void main(String[] args) {

            IDriver driver = new Driver(new Benz());

            driver.drive();

        }

    }

     

    Setter依赖注入:

    驾驶员接口及实现类

    public interface IDriver {

        public void drive();

        public void setCar(ICar car);

    }

     

    public class Driver implements IDriver {

     

        private ICar car;

     

        @Override

        public void drive() {

            // TODO Auto-generated method stub

            car.running();

        }

     

        public ICar getCar() {

            return car;

        }

     

        public void setCar(ICar _car) {

            this.car = _car;

        }

     

    }

    汽车接口及实现类

    public interface ICar {

       public void running();

    }

     

    public class BMW implements ICar {

     

        @Override

        public void running() {

            // TODO Auto-generated method stub

            System.out.println("宝马行驶..");

        }

    }

    public class Benz implements ICar {

     

        @Override

        public void running() {

            // TODO Auto-generated method stub

            System.out.println("奔驰行驶..");

        }

     

    }

    场景客户端调用

    public class Client {

        public static void main(String[] args) {

     

            IDriver driver = new Driver();

            driver.setCar(new Benz());

            driver.drive();

        }

    }

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  • 原文地址:https://www.cnblogs.com/shawnblogs/p/4816499.html
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