依赖倒转原则

普通方式

public class DependecyInversionPutong {

    public static void main(String[] args) {
        new Person().receiver(new Email());

    }
}


class Email {
    public String getInfo() {
        return "email content is " + "hello world";
    }
}


class Person {
    public void receiver(Email email){
        System.out.println(email.getInfo());
    }
}

升级方式

public class DependecyInversion {
    public static void main(String[] args) {
        new Person().receiver(new Email());
    }
}

interface IReceiver {
    public String getInfo();
}

class Email implements IReceiver {
    public String getInfo() {
        return "email content is " + "hello world";
    }
}


class Person {
    public void receiver(IReceiver receiver) {
        System.out.println(receiver.getInfo());
    }
}

依赖关系传递的三种方式

public class DependencyPass {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        ChangHong changHong = new ChangHong();
//        OpenAndClose openAndClose = new OpenAndClose();
//        openAndClose.open(changHong);
        
        //通过构造器进行依赖传递
//        OpenAndClose openAndClose = new OpenAndClose(changHong);
//        openAndClose.open();
        //通过setter方法进行依赖传递
        OpenAndClose openAndClose = new OpenAndClose();
        openAndClose.setTv(changHong);
        openAndClose.open();

    }

}

// 方式1： 通过接口传递实现依赖
// 开关的接口
// interface IOpenAndClose {
// public void open(ITV tv); //抽象方法,接收接口
// }
//
// interface ITV { //ITV接口
// public void play();
// }
// 
// class ChangHong implements ITV {
//
//    @Override
//    public void play() {
//        // TODO Auto-generated method stub
//        System.out.println("长虹电视机，打开");
//    }
//     
// }
//// 实现接口
// class OpenAndClose implements IOpenAndClose{
// public void open(ITV tv){
// tv.play();
// }
// }

// 方式2: 通过构造方法依赖传递
// interface IOpenAndClose {
// public void open(); //抽象方法
// }
// interface ITV { //ITV接口
// public void play();
// }
// class OpenAndClose implements IOpenAndClose{
// public ITV tv; //成员
// public OpenAndClose(ITV tv){ //构造器
// this.tv = tv;
// }
// public void open(){
// this.tv.play();
// }
// }


// 方式3 , 通过setter方法传递
interface IOpenAndClose {
    public void open(); // 抽象方法

    public void setTv(ITV tv);
}

interface ITV { // ITV接口
    public void play();
}

class OpenAndClose implements IOpenAndClose {
    private ITV tv;

    public void setTv(ITV tv) {
        this.tv = tv;
    }

    public void open() {
        this.tv.play();
    }
}

class ChangHong implements ITV {

    @Override
    public void play() {
        // TODO Auto-generated method stub
        System.out.println("长虹电视机，打开");
    }
     
}

依赖倒转原则的注意事项和细节