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());
    }
}
 

升級方式

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());
    }
}

依賴關係傳遞的三種方式

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);
        
        //通過構造器進行依賴傳遞
//        OpenAndClose openAndClose = new OpenAndClose(changHong);
//        openAndClose.open();
        //通過setter方法進行依賴傳遞
        OpenAndClose openAndClose = new OpenAndClose();
        openAndClose.setTv(changHong);
        openAndClose.open();

    }

}

// 方式1： 通過介面傳遞實現依賴
// 開關的介面
// interface IOpenAndClose {
// public void open(ITV tv); //抽象方法,接收介面
// }
//
// interface ITV { //ITV介面
// public void play();
// }
// 
// class ChangHong implements ITV {
//
//    @Override
//    public void play() {
//        // TODO Auto-generated method stub
//        System.out.println("長虹電視機，開啟");
//    }
//     
// }
//// 實現介面
// class OpenAndClose implements IOpenAndClose{
// public void open(ITV tv){
// tv.play();
// }
// }

// 方式2: 通過構造方法依賴傳遞
// interface IOpenAndClose {
// public void open(); //抽象方法
// }
// interface ITV { //ITV介面
// public void play();
// }
// class OpenAndClose implements IOpenAndClose{
// public ITV tv; //成員
// public OpenAndClose(ITV tv){ //構造器
// this.tv = tv;
// }
// public void open(){
// this.tv.play();
// }
// }


// 方式3 , 通過setter方法傳遞
interface IOpenAndClose {
    public void open(); // 抽象方法

    public void setTv(ITV tv);
}

interface ITV { // ITV介面
    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("長虹電視機，開啟");
    }
     
}

依賴倒轉原則的注意事項和細節