public interface Target {//目标角色有自己的方法public void request();
}

目标角色的实现类，一个正在服役的目标角色。

public class ConcreteTarget implements Target {public void request() {System.out.println("I have nothing to do. if you need any help,pls call me!");  }}

源角色。源角色也是已经在服役状态。

public class Adaptee {//原有的业务逻辑public void doSomething(){System.out.println("I'm kind of busy,leave me alone,pls!");}
}

适配器角色，对象适配器和类适配器。

public class Adapter implements Target {private Adaptee adaptee;public Adapter() {adaptee = new Adaptee();}public void request() {adaptee.doSomething();}}

类适配器代码：

public class Adapter extends Adaptee implements Target {public void request() {super.doSomething();}}

场景类：

public class Client {public static void main(String[] args) {//原有的业务逻辑Target target = new ConcreteTarget();target.request();//现在增加了适配器角色后的业务逻辑Target target2 = new Adapter();target2.request();}
}

2. 手机电源适配器例子，家用电源是220V的，但是，对于手机来说，根本大不了这么多，所以，在这种情况下，需要电源适配器来为我们提供适合手机的电压。

public class Client {public static void main(String[] args) {Target mobliePower = new MobilePowerAdapter();int power = mobliePower.getPower10V();System.out.println("the mobile power is " + power + "V");}
}interface Target {int getPower10V();
}class Power {public int getPower220V() {return 220; }
}class MobilePowerAdapter implements Target {private Power mPower;public MobilePowerAdapter() {mPower = new Power();}@Overridepublic int getPower10V() {int power = mPower.getPower220V();power = 10;return power;}}

3. 最后一个例子：

public interface IOuterUserBaseInfo {//基本信息，比如名称，性别，手机号码了等public Map getUserBaseInfo();
}public interface IOuterUserHomeInfo {//用户的家庭信息public Map getUserHomeInfo();
}public interface IOuterUserOfficeInfo {//工作区域信息public Map getUserOfficeInfo();
}public class OuterUserBaseInfo implements IOuterUserBaseInfo {/* * 用户的基本信息*/public Map getUserBaseInfo() {HashMap baseInfoMap = new HashMap();baseInfoMap.put("userName", "这个员工叫混世魔王....");baseInfoMap.put("mobileNumber", "这个员工电话是....");return baseInfoMap;}}public class OuterUserHomeInfo implements IOuterUserHomeInfo {/* * 员工的家庭信息*/public Map getUserHomeInfo() {HashMap homeInfo = new HashMap();homeInfo.put("homeTelNumbner", "员工的家庭电话是....");homeInfo.put("homeAddress", "员工的家庭地址是....");return homeInfo;}
}public class OuterUserOfficeInfo implements IOuterUserOfficeInfo {/* * 员工的工作信息，比如职位了等*/public Map getUserOfficeInfo() {HashMap officeInfo = new HashMap();officeInfo.put("jobPosition","这个人的职位是BOSS...");officeInfo.put("officeTelNumber", "员工的办公电话是....");return officeInfo;}}//用户信息对象
public interface IUserInfo {//获得用户姓名public String getUserName();//获得家庭地址public String getHomeAddress();//手机号码，这个太重要，手机泛滥呀public String getMobileNumber();//办公电话，一般式座机public String getOfficeTelNumber();//这个人的职位是啥public String getJobPosition();//获得家庭电话，这个有点缺德，我是不喜欢打家庭电话讨论工作public String getHomeTelNumber();
}public class UserInfo implements IUserInfo {/* * 获得家庭地址，下属送礼也可以找到地方*/public String getHomeAddress() {System.out.println("这里是员工的家庭地址....");return null;}/* * 获得家庭电话号码*/public String getHomeTelNumber() {System.out.println("员工的家庭电话是....");return null;}/* * 员工的职位，是部门经理还是小兵*/public String getJobPosition() {System.out.println("这个人的职位是BOSS....");return null;}/* * 手机号码*/public String getMobileNumber() {System.out.println("这个人的手机号码是0000....");return null;}/* * 办公室电话，烦躁的时候最好“不小心”把电话线踢掉，我经常这么干，对己对人都有好处*/public String getOfficeTelNumber() {System.out.println("办公室电话是....");return null;}/* * 姓名了，这个老重要了*/public String getUserName() {System.out.println("姓名叫做...");return null;}}//把OuterUser包装成UserInfo
@SuppressWarnings("all")
public class OuterUserInfo implements IUserInfo {//源目标对象private IOuterUserBaseInfo baseInfo = null;  //员工的基本信息private IOuterUserHomeInfo homeInfo = null; //员工的家庭 信息private IOuterUserOfficeInfo officeInfo = null; //工作信息//数据处理private Map baseMap = null;private Map homeMap = null;private Map officeMap = null;//构造函数传递对象public OuterUserInfo(IOuterUserBaseInfo _baseInfo,IOuterUserHomeInfo _homeInfo,IOuterUserOfficeInfo _officeInfo){this.baseInfo = _baseInfo;this.homeInfo = _homeInfo;this.officeInfo = _officeInfo;//数据处理this.baseMap = this.baseInfo.getUserBaseInfo();this.homeMap = this.homeInfo.getUserHomeInfo();this.officeMap = this.officeInfo.getUserOfficeInfo();}//家庭地址public String getHomeAddress() {String homeAddress = (String)this.homeMap.get("homeAddress");System.out.println(homeAddress);return homeAddress;}//家庭电话号码public String getHomeTelNumber() {String homeTelNumber = (String)this.homeMap.get("homeTelNumber");System.out.println(homeTelNumber);return homeTelNumber;}//职位信息public String getJobPosition() {String jobPosition = (String)this.officeMap.get("jobPosition");System.out.println(jobPosition);return jobPosition;}//手机号码public String getMobileNumber() {String mobileNumber = (String)this.baseMap.get("mobileNumber");System.out.println(mobileNumber);return mobileNumber;}//办公电话public String getOfficeTelNumber() {String officeTelNumber = (String)this.officeMap.get("officeTelNumber");System.out.println(officeTelNumber);return officeTelNumber;}// 员工的名称public String getUserName() {String userName = (String)this.baseMap.get("userName");System.out.println(userName);return userName;}}//这就是我们具体的应用了，比如老板要查所有的20-30的女性信息
public class Client {public static void main(String[] args) {//外系统的人员信息IOuterUserBaseInfo baseInfo = new OuterUserBaseInfo();IOuterUserHomeInfo homeInfo = new OuterUserHomeInfo();IOuterUserOfficeInfo officeInfo = new OuterUserOfficeInfo();//传递三个对象IUserInfo youngGirl = new OuterUserInfo(baseInfo,homeInfo,officeInfo); //从数据库中查到101个for(int i=0;i<101;i++){youngGirl.getMobileNumber();}}}