學習筆記專區

package model;

public class DemoDAO {

    public DemoDAO() {

       System.out.println("DemoDAO's constructor");

    }

}

範例一：

package model;

public class DemoService {

private DemoDAO dao =new DemoDAO();

}

範例一：

package org.iiiedu.samuel.ProjSpringDemo;

import model.DemoService;

public class TestDemoService {

    public static void main(String[] args) {

       DemoService service = new DemoService();

    }

}

範例二：

package model;

public class DemoService {

private DemoDAO dao =null;

public DemoService(DemoDAO dao){

    //我是建構子

    this.dao=dao;

}

}

範例二：

package org.iiiedu.samuel.ProjSpringDemo;

import model.DemoDAO;

import model.DemoService;

public class TestDemoService {

    public static void main(String[] args) {

       DemoDAO dao = new DemoDAO();

       DemoService service = new DemoService(dao);

    }

}

範例三；

package model;

public class DemoService {

//範例二

//private DemoDAO dao =null;

//public DemoService(DemoDAO dao){

//  //我是建構子

//  this.dao=dao;

//}

    private DemoDAO dao = null;

    public void setDAO(DemoDAO dao) {

       // 我是建構子

       this.dao = dao;

    }

}

範例三；

package org.iiiedu.samuel.ProjSpringDemo;

import model.DemoDAO;

import model.DemoService;

public class TestDemoService {

    public static void main(String[] args) {

//     範例二

//     DemoDAO dao = new DemoDAO();

//     DemoService service = new DemoService(dao);

       DemoDAO dao = new DemoDAO();

       DemoService service = new DemoService();

       service.setDAO(dao);

    }

}