diff --git a/DS01_SimpleFactory.java b/DS01_SimpleFactory.java
deleted file mode 100644
index cb23822..0000000
--- a/DS01_SimpleFactory.java
+++ /dev/null
@@ -1,42 +0,0 @@
-//抽象产品
-interface Car
-{
-	public void drive();
-}
-
-//具体产品类
-class Benz implements Car{
-	public void drive() {
-		System.out.println("Driving Benz ");
-	}
-}
-
-class Bmw implements Car{
-	public void drive() {
-		System.out.println("Driving Bmw ");
-	}
-}
-
-//工厂类角色
-class Driver{ 
-	public static Car driverCar(String s)throws Exception {
-		if(s.equalsIgnoreCase("Benz"))
-			return  new Benz();
-		else  if(s.equalsIgnoreCase("Bmw"))
-			return new Bmw();
-		else throw new Exception();
-		}
-
-} 
-
-public class DS01_SimpleFactory{ 
-	public static void main(String[] args) 
-	{
-		try{
-			Car car = Driver.driverCar("Benz");
-			car.drive();		     
-		} 
-		catch (Exception e){ 
-		} 
-	}
-}   
diff --git a/DS02_FactoryMethod.java b/DS02_FactoryMethod.java
deleted file mode 100644
index 761fb0c..0000000
--- a/DS02_FactoryMethod.java
+++ /dev/null
@@ -1,52 +0,0 @@
-//抽象工厂
-interface Driver{
-	public Car driverCar();
-} 
-
-//具体工厂类
-class BenzDriver implements Driver{
-	public Car driverCar(){
-		return new Benz();
-	}
-} 
-
-class BmwDriver implements Driver{
-	public Car driverCar(){
-		return new Bmw();
-	}
-} 
-
-//抽象产品
-interface Car
-{
-	public void drive();
-}
-
-//具体产品类
-class Benz implements Car{
-	public void drive() {
-		System.out.println("Driving Benz ");
-	}
-}
-
-class Bmw implements Car{
-	public void drive() {
-		System.out.println("Driving Bmw ");
-	}
-}
-
-public class DS02_FactoryMethod 
-{
-	public static void main(String[] args) 
-	{
-		try{
-			Driver driver = new BenzDriver();
-			Car car = driver.driverCar();
-			car.drive();
-		     
-		} 
-		catch (Exception e){
-			System.out.println(e.getMessage());
-		} 
-	}
-}
diff --git a/DS03_AbstractFactory.java b/DS03_AbstractFactory.java
deleted file mode 100644
index 0971e29..0000000
--- a/DS03_AbstractFactory.java
+++ /dev/null
@@ -1,93 +0,0 @@
-
-//抽象产品
-interface ICat {
-
-    void eat();
-}
-
-interface IDog {
-
-    void eat();
-}
-
-//具体产品
-class BlackCat implements ICat {
-
-    public void eat() {
-        System.out.println("The black cat is eating!");
-    }
-}
-
-class WhiteCat implements ICat {
-
-    public void eat() {
-        System.out.println("The white cat is eating! ");
-    }
-}
-
-class BlackDog implements IDog {
-
-    public void eat() {
-        System.out.println("The black dog is eating");
-    }
-}
-
-class WhiteDog implements IDog {
-
-    public void eat() {
-        System.out.println("The white dog is eating!");
-    }
-}
-
-
-// 抽象工厂
-interface IAnimalFactory{
-
-    ICat createCat();
-	
-    IDog createDog();
-}
-
-//具体工厂
-class BlackAnimalFactory implements IAnimalFactory {
-
-    public ICat createCat() {
-        return new BlackCat();
-    }
-
-    public IDog createDog() {
-        return new BlackDog();
-    }
-}
-
-
-class WhiteAnimalFactory implements IAnimalFactory {
-
-    public ICat createCat() {
-        return new WhiteCat();
-    }
-
-    public IDog createDog() {
-        return new WhiteDog();
-    }
-}
-
-public class DS03_AbstractFactory{ 
-	public static void main(String[] args) {
-		IAnimalFactory blackAnimalFactory = new BlackAnimalFactory();
-		ICat blackCat = blackAnimalFactory.createCat();
-		blackCat.eat();
-		IDog blackDog = blackAnimalFactory.createDog();
-		blackDog.eat();
-    
-		IAnimalFactory whiteAnimalFactory = new WhiteAnimalFactory();
-		ICat whiteCat = whiteAnimalFactory.createCat();
-		whiteCat.eat();
-		IDog whiteDog = whiteAnimalFactory.createDog();
-		whiteDog.eat();
-	}
-} 
-
-
-
-
diff --git a/DS04_Builder.java b/DS04_Builder.java
deleted file mode 100644
index ba1732f..0000000
--- a/DS04_Builder.java
+++ /dev/null
@@ -1,99 +0,0 @@
-interface PersonBuilder {
-
-    void buildHead();
-    
-    void buildBody();
-    
-    void buildFoot();
-
-    Person buildPerson();
-}
-//ConcreteBuilder 
-
-
-class ManBuilder implements PersonBuilder {
-
-    Person person;
-    
-    public ManBuilder() {
-        person = new Man();
-    }
-    
-    public void buildBody() {
-        person.setBody("建造男人的身体");
-    }
-
-    public void buildFoot() {
-        person.setFoot("建造男人的脚");
-    }
-
-    public void buildHead() {
-        person.setHead("建造*人的头");
-    }
-
-    public Person buildPerson() {
-        return person;
-    }
-}
-
-
-//Director
-class PersonDirector {
-
-    public Person constructPerson(PersonBuilder pb) {
-        pb.buildHead();
-        pb.buildBody();
-        pb.buildFoot();
-        return pb.buildPerson();
-    }
-}
-
-//Product 
-class Person {
-
-    private String head;
-    
-    private String body;
-    
-    private String foot;
-
-    public String getHead() {
-        return head;
-    }
-
-    public void setHead(String head) {
-        this.head = head;
-    }
-
-    public String getBody() {
-        return body;
-    }
-
-    public void setBody(String body) {
-        this.body = body;
-    }
-
-    public String getFoot() {
-        return foot;
-    }
-
-    public void setFoot(String foot) {
-        this.foot = foot;
-    }
-}
-
-class Man extends Person {
-
-}
-
-
-public class DS04_Builder{
-    
-    public static void main(String[] args) {
-        PersonDirector pd = new PersonDirector();
-        Person person = pd.constructPerson(new ManBuilder());
-        System.out.println(person.getBody());
-        System.out.println(person.getFoot());
-        System.out.println(person.getHead());
-    }
-}
diff --git a/DS04_Singleton.java b/DS04_Singleton.java
deleted file mode 100644
index 8a493d6..0000000
--- a/DS04_Singleton.java
+++ /dev/null
@@ -1,60 +0,0 @@
-import java.util.HashMap;
-class Singleton
-{
-	//用来存放对应关系
-	private static HashMap sinRegistry = new HashMap();
-	static private Singleton s = new Singleton();
-	//受保护的构造函数
-	protected Singleton()
-	{}
-	public static Singleton getInstance(String name)
-	{
-		if(name == null)
-			name = "Singleton";
-		if(sinRegistry.get(name)==null)
-		{
-			try{
-				sinRegistry.put(name , Class.forName(name).newInstance());
-			}catch(Exception e)
-			{
-				e.printStackTrace();
-			}
-		}
-		return (Singleton)(sinRegistry.get(name));
-	}
-
-	public void test()
-	{
-		System.out.println("getclasssuccess!");
-	}
-}
-
-class SingletonChild1 extends Singleton
-{
-	public SingletonChild1(){}
-	static public SingletonChild1 getInstance()
-	{
-		return (SingletonChild1)Singleton.getInstance("SingletonChild1");
-	}
-	public void test()
-	{
-		System.out.println("getclasssuccess111!");
-	}
-}
-
-class SingletonChild2 extends Singleton
-{
-	public SingletonChild1(){}
-	static public SingletonChild1 getInstance()
-	{
-		return (SingletonChild1)Singleton.getInstance("SingletonChild2");
-	}
-	public void test()
-	{
-		System.out.println("getclasssuccess222!");
-	}
-}
-
-public class DS04_Singleton{
-	
-} 
\ No newline at end of file
diff --git a/DS05_Prototyte.java b/DS05_Prototyte.java
deleted file mode 100644
index ed5ca2f..0000000
--- a/DS05_Prototyte.java
+++ /dev/null
@@ -1,38 +0,0 @@
-class Prototype implements Cloneable {
-
-    private String name;
-    
-    public void setName(String name) {
-        this.name = name;
-    }
-    
-    public String getName() {
-        return this.name;
-    }
-
-    public Object clone(){
-        try {
-            return super.clone();
-        } catch (Exception e) {
-            e.printStackTrace();
-            return null;
-        }
-    }
-}
-
-class ConcretePrototype extends Prototype {
-
-    public ConcretePrototype(String name) {
-        setName(name);
-    }
-}
-
-public class DS05_Prototyte {
-
-    public static void main(String[] args) {
-        Prototype pro = new ConcretePrototype("prototype");
-        Prototype pro2 = (Prototype)pro.clone();
-        System.out.println(pro.getName());
-        System.out.println(pro2.getName());
-    }
-}
diff --git a/DS06_Adapter.java b/DS06_Adapter.java
deleted file mode 100644
index b90dc27..0000000
--- a/DS06_Adapter.java
+++ /dev/null
@@ -1,39 +0,0 @@
-interface Target {
-
-    void adapteeMethod();
-    
-    void adapterMethod();
-}
-
-class Adaptee {
-    public void adapteeMethod() {
-        System.out.println("Adaptee method!");
-    }
-}
-
-class Adapter implements Target {
-
-    private Adaptee adaptee;
-    
-    public Adapter(Adaptee adaptee) {
-        this.adaptee = adaptee;
-    }
-
-	public void adapteeMethod() {
-		adaptee.adapteeMethod();
-	}
-
-	public void adapterMethod() {
-		System.out.println("Adapter method!");
-    }
-}
-
-public class DS06_Adapter{
-
-    public static void main(String[] args) {
-        Target target = new Adapter(new Adaptee());
-        target.adapteeMethod();
-        
-        target.adapterMethod();
-    }
-}
diff --git a/DS07_Bright.java b/DS07_Bright.java
deleted file mode 100644
index 6de3654..0000000
--- a/DS07_Bright.java
+++ /dev/null
@@ -1,87 +0,0 @@
-abstract class Person {
-
-    private Clothing clothing;
-    
-    private String type;
-
-    public Clothing getClothing() {
-        return clothing;
-    }
-
-    public void setClothing() {
-        //this.clothing = ClothingFactory.getClothing();
-    }
-    
-    public void setType(String type) {
-        this.type = type;
-    }
-    
-    public String getType() {
-        return this.type;
-    }
-    
-    public abstract void dress();
-}
-
-class Man extends Person {
-    
-    public Man() {
-        setType("男人");
-    }
-    
-    public void dress() {
-        Clothing clothing = getClothing();
-        clothing.personDressCloth(this);
-    }
-}
-
-class Lady extends Person {
-
-    public Lady() {
-        setType("女人");
-    }
-    
-    public void dress() {
-        Clothing clothing = getClothing();
-        clothing.personDressCloth(this);
-    }
-}
-
-abstract class Clothing {
-
-    public abstract void personDressCloth(Person person);
-}
-
-class Jacket extends Clothing {
-
-    public void personDressCloth(Person person) {
-        System.out.println(person.getType() + "穿马甲");
-    }
-}
-
-class Trouser extends Clothing {
-
-    public void personDressCloth(Person person) {
-        System.out.println(person.getType() + "穿裤子");
-    }
-}
-
-public class DS07_Bright {
-
-    public static void main(String[] args) {
-        
-        Person man = new Man();
-        
-        Person lady = new Lady();
-        
-        Clothing jacket = new Jacket();
-        
-        Clothing trouser = new Trouser();
-        
-        jacket.personDressCloth(man);
-        trouser.personDressCloth(man);
-
-        jacket.personDressCloth(lady);
-        trouser.personDressCloth(lady);
-    }
-}
diff --git a/DS08_Composite.java b/DS08_Composite.java
deleted file mode 100644
index db85680..0000000
--- a/DS08_Composite.java
+++ /dev/null
@@ -1,113 +0,0 @@
-//Component
-import java.util.*;
-
-abstract class Employer {
-
-    private String name;
-    
-    public void setName(String name) {
-        this.name = name;
-    }
-    
-    public String getName() {
-        return this.name;
-    }
-    
-    public abstract void add(Employer employer);
-    
-    public abstract void delete(Employer employer);
-    
-    public List employers;
-    
-    public void printInfo() {
-        System.out.println(name);
-    }
-    
-    public List getEmployers() {
-        return this.employers;
-    }
-}
-
-
-//Leaf
-class Programmer extends Employer {
-
-    public Programmer(String name) {
-        setName(name);
-        employers = null;//程序员, 表示没有下属了
-    }
-
-    public void add(Employer employer) {
-        
-    }
-
-    public void delete(Employer employer) {
-        
-    }
-}
-
-class ProcectAssistant extends Employer {
-
-    public ProcectAssistant(String name) {
-        setName(name);
-        employers = null;//项目助理, 表示没有下属了
-    }
-
-    public void add(Employer employer) {
-        
-    }
-
-    public void delete(Employer employer) {
-        
-    }
-}
-
-
-//Composite
-class ProjectManager extends Employer {
-    
-    public ProjectManager(String name) {
-        setName(name);
-        employers = new ArrayList();
-    }
-    
-    public void add(Employer employer) {
-        employers.add(employer);
-    }
-
-    public void delete(Employer employer) {
-        employers.remove(employer);
-    }
-}
-
-
-//Client
-public class DS08_Composite {
-
-    public static void main(String[] args) {
-        Employer pm = new ProjectManager("项目经理");
-        Employer pa = new ProcectAssistant("项目助理");
-        Employer programmer1 = new Programmer("程序员一");
-        Employer programmer2 = new Programmer("程序员二");
-        
-        pm.add(pa);//为项目经理添加项目助理
-        pm.add(programmer2);//为项目经理添加程序员
-        
-		//注意，这里如果不加<>里面的东西，竟然不能编译通过，这个是因为泛型编程
-        List<Employer> ems = pm.getEmployers();
-		int emsCount = ems.size();
-		for(int i = 0; i <emsCount;++i)
-		{
-			Employer em = ems.get(i);
-			System.out.println(em.getName());
-		}
-		/*
-        for (Employer em : ems) {
-            System.out.println(em.getName());
-        }
-		*/
-    }
-}
-
-
-
diff --git a/DS09_Decorator.java b/DS09_Decorator.java
deleted file mode 100644
index 8bd982c..0000000
--- a/DS09_Decorator.java
+++ /dev/null
@@ -1,66 +0,0 @@
-//Component定义一个对象接口，可以给这些对象动态地添加职责。
-interface Person {
-
-    void eat();
-}
-
-//ConcreteComponent 定义一个对象，可以给这个对象添加一些职责。
-class Man implements Person {
-
-	public void eat() {
-		System.out.println("男人在吃");
-	}
-}
-
-//Decorator 维持一个执行Component对象的指针，并定义一个与Componect 接口一致的接口。
-abstract class Decorator implements Person {
-
-    protected Person person;
-    
-    public void setPerson(Person person) {
-        this.person = person;
-    }
-    
-    public void eat() {
-        person.eat();
-    }
-}
-
-//ConcreteDectrator 想组建添加职责
-class ManDecoratorA extends Decorator {
-
-    public void eat() {
-        super.eat();
-        reEat();
-        System.out.println("ManDecoratorA类");
-    }
-
-    public void reEat() {
-        System.out.println("再吃一顿饭");
-    }
-}
-
-class ManDecoratorB extends Decorator {
-    
-    public void eat() {
-        super.eat();
-        System.out.println("===============");
-        System.out.println("ManDecoratorB类");
-    }
-}
-
-public class DS09_Decorator{
-
-    public static void main(String[] args) {
-        Man man = new Man();
-        ManDecoratorA md1 = new ManDecoratorA();
-        ManDecoratorB md2 = new ManDecoratorB();
-        
-        md1.setPerson(man);
-		md1.eat();
-        md2.setPerson(md1);
-        md2.eat();
-    }
-}
-
-
diff --git a/DS10_Facade.java b/DS10_Facade.java
deleted file mode 100644
index 2de35de..0000000
--- a/DS10_Facade.java
+++ /dev/null
@@ -1,85 +0,0 @@
-
-interface ServiceA{ 
-	public void methodA();
-} 
-
-interface ServiceB{ 
-	public void methodB();
-} 
-
-interface ServiceC{ 
-	public void methodC();
-} 
-
-//Subsystemclasse*
-class ServiceAImpl implements ServiceA {
-
-    public void methodA() {
-        System.out.println("这是服务A");
-    }
-}
-
-class ServiceBImpl implements ServiceB {
-
-    public void methodB() {
-        System.out.println("这是服务B");
-    }
-}
-
-class ServiceCImpl implements ServiceC {
-
-    public void methodC() {
-        System.out.println("这是服务C");
-    }
-}
-
-//Facade 
-class Facade {
-
-    ServiceA sa;
-    
-    ServiceB sb;
-    
-    ServiceC sc;
-    
-    public Facade() {
-        sa = new ServiceAImpl();
-        sb = new ServiceBImpl();
-        sc = new ServiceCImpl(); 
-    }
-    
-    public void methodA() {
-        sa.methodA();
-        //sb.methodB();
-    }
-    
-    public void methodB() {
-        sb.methodB();
-        //sc.methodC();
-    }
-    
-    public void methodC() {
-        sc.methodC();
-        //sa.methodA();
-    }
-}
-
-
-public class DF10_Facade {
-    
-    public static void main(String[] args) {
-    	ServiceA sa = new ServiceAImpl();
-    	ServiceB sb = new ServiceBImpl();
-        
-        sa.methodA();
-        sb.methodB();
-        
-        System.out.println("========");
-        //facade
-        Facade facade = new Facade();
-        facade.methodA();
-        facade.methodB();
-    }
-}
-
-
diff --git a/DS11_Flyweight.java b/DS11_Flyweight.java
deleted file mode 100644
index b3c3f65..0000000
--- a/DS11_Flyweight.java
+++ /dev/null
@@ -1,65 +0,0 @@
-import java.util.*;
-
-//这个例子不太好
-
-//Flyweight 
-interface Flyweight {
-
-    void action(int arg);
-}
-
-//ConcreteFlyweight
-class FlyweightImpl implements Flyweight {
-
-    public void action(int arg) {
-        // TODO Auto-generated method stub
-        System.out.println("参数值:" + arg);
-    }
-}
-
-//FlyweightFactory 
-class FlyweightFactory {
-
-    private static Map flyweights = new HashMap();
-    
-    public FlyweightFactory(String arg) {
-        flyweights.put(arg, new FlyweightImpl());
-    }
-    
-    public static Flyweight getFlyweight(String key) {
-        if (flyweights.get(key) == null) {
-            flyweights.put(key, new FlyweightImpl());
-        }
-        return (Flyweight)flyweights.get(key);
-    }
-    
-    public static int getSize() {
-        return flyweights.size();
-    }
-}
-
-
-//Test
-public class DS11_Flyweight{
-
-    public static void main(String[] args) {
-        // TODO Auto-generated method stub
-        Flyweight fly1 = FlyweightFactory.getFlyweight("a");
-        fly1.action(1);
-        
-        Flyweight fly2 = FlyweightFactory.getFlyweight("a");
-        System.out.println(fly1 == fly2);
-        
-        Flyweight fly3 = FlyweightFactory.getFlyweight("b");
-        fly3.action(2);
-        
-        Flyweight fly4 = FlyweightFactory.getFlyweight("c");
-        fly4.action(3);
-        
-        Flyweight fly5 = FlyweightFactory.getFlyweight("d");
-        fly4.action(4);
-        
-        System.out.println(FlyweightFactory.getSize());
-    }
-}
-
diff --git a/DS12_Proxy.java b/DS12_Proxy.java
deleted file mode 100644
index 14dbef8..0000000
--- a/DS12_Proxy.java
+++ /dev/null
@@ -1,45 +0,0 @@
-//Proxy 
-class ProxyObject implements Object {
-
-    Object obj;
-    
-    public ProxyObject() {
-        System.out.println("这是代理类");
-        obj = new ObjectImpl();
-    }
-    
-    public void action() {
-        System.out.println("代理开始");
-        obj.action();
-        System.out.println("代理结束");
-    }
-}
-
-//Subject
-interface Object {
-
-    void action();
-}
-
-//RealSubject
-class ObjectImpl implements Object {
-
-    public void action() {
-        System.out.println("========");
-        System.out.println("========");
-        System.out.println("这是被代理的类");
-        System.out.println("========");
-        System.out.println("========");
-    }
-}
-
-public class DS12_Proxy{
-    public static void main(String[] args){
-    	Object obj = new ProxyObject();
-        obj.action();
-    }
-}
-
-
-
-
diff --git a/DS13_CHAIN.java b/DS13_CHAIN.java
deleted file mode 100644
index 90a7b57..0000000
--- a/DS13_CHAIN.java
+++ /dev/null
@@ -1,83 +0,0 @@
-//这个例子不是很好。
-//Hand*er 
-
-interface RequestHandle {
-
-    void handleRequest(Request request);
-}
-
-
-//ConcreteHandler
-class HRRequestHandle implements RequestHandle {
-
-    public void handleRequest(Request request) {
-        if (request instanceof DimissionRequest) {
-            System.out.println("要离职, 人事审批!");
-        } 
-
-        System.out.println("请求完成");
-    }
-}
-
-
-class PMRequestHandle implements RequestHandle {
-
-    RequestHandle rh;
-    
-    public PMRequestHandle(RequestHandle rh) {
-        this.rh = rh;
-    }
-    
-    public void handleRequest(Request request) {
-        if (request instanceof AddMoneyRequest) {
-            System.out.println("要加薪, 项目经理审批!");
-        } else {
-            rh.handleRequest(request);
-        }
-    }
-}
-
-class TLRequestHandle implements RequestHandle {
-
-    RequestHandle rh;
-    
-    public TLRequestHandle(RequestHandle rh) {
-        this.rh = rh;
-    }
-
-    public void handleRequest(Request request) {
-        if (request instanceof LeaveRequest) {
-            System.out.println("要请假, 项目组长审批!");
-        } else {
-            rh.handleRequest(request);
-        }
-    }
-}
-
-
-public class DF13_CHAIN{    
-    public static void main(String[] args) {
-        RequestHandle hr =new HRRequestHandle();
-        RequestHandle pm = new PMRequestHandle(hr);
-        RequestHandle tl = new TLRequestHandle(pm);
-        
-        //team leader处理离职请求
-        Request request = new DimissionRequest();
-        tl.handleRequest(request);
-        
-        System.out.println("===========");
-        //team leader处理加薪请求
-        request = new AddMoneyRequest();
-        tl.handleRequest(request);
-        
-        System.out.println("========");
-        //项目经理上理辞职请求
-        request = new DimissionRequest();
-        pm.handleRequest(request);
-    }
-}
-
-
-
-
-
diff --git a/DS14_Command.java b/DS14_Command.java
deleted file mode 100644
index acaa1c1..0000000
--- a/DS14_Command.java
+++ /dev/null
@@ -1,60 +0,0 @@
-//Command声明执行操作的接口
-abstract class Command {
-    
-    protected Receiver receiver;
-    
-    public Command(Receiver receiver) {
-        this.receiver = receiver;
-    }
-    
-    public abstract void execute();
-}
-
-//creteCommand将一个接收者对象绑定于一个动作。调用接收者相应的操作，以实现Execute。
-class CommandImpl extends Command {
-
-    public CommandImpl(Receiver receiver) {
-        super(receiver);
-    }
-    
-    public void execute() {
-        receiver. receive ();
-    }
-}
-
-//Invoker要求该命令执行这个请求。
-
-class Invoker {
-
-    private Command command;
-    
-    public void setCommand(Command command) {
-        this.command = command;
-    }
-    
-    public void execute() {
-        command.execute();
-    }
-}
-
-//Receiver知道如何实现与执行一个请求相关的操作。任何类都可能作为一个接收者。
-class Receiver {
-
-    public void receive() {
-        System.out.println("This is Receive class!");
-    }
-}
-
-public class DS14_Command{
-
-    public static void main(String[] args) {
-        Receiver rec = new Receiver();
-        Command cmd = new CommandImpl(rec);
-        Invoker i = new Invoker();
-        i.setCommand(cmd);
-        i.execute();
-    }
-}
-
-
-
diff --git a/DS15_Expression.java b/DS15_Expression.java
deleted file mode 100644
index 959aa10..0000000
--- a/DS15_Expression.java
+++ /dev/null
@@ -1,108 +0,0 @@
-//这个例子不错，需要再好好看看
-
-import java.util.*;
-//上下文（环境）角色，使用HashMap 来存储变量对应的数值
-class Context{
-	private Map valueMap = new HashMap();
-	public void addValue(Variable x , int y){
-		Integer yi = new Integer(y);
-		valueMap.put(x , yi);
-	}
-
-	public int LookupValue(Variable x){
-		int i = ((Integer)valueMap.get(x)).intValue();
-		return i ;
-	}
-}
-
-//抽象表达式角色，也可以用接口来实现
-abstract class Expression{
-	public abstract int interpret(Context con);
-}
-
-//终结符表达式角色
-class Constant extends Expression{
-	private int i ;
-	public Constant(int i){
-		this.i = i;
-	}
-	public int interpret(Context con){
-		return i ;
-	}
-}
-
-class Variable extends Expression{
-	public int interpret(Context con) {
-	//this 为调用interpret 方法的Variable 对象
-		return con.LookupValue(this);
-	}
-}
-
-//非终结符表达式角色
-class Add extends Expression{
-	private Expression left ,right ;
-	public Add(Expression left , Expression right) {
-		this.left = left ;
-		this.right= right ;
-	}
-	public int interpret(Context con){
-		return left.interpret(con) + right.interpret(con);
-	}
-}
-
-class Subtract extends Expression{
-	private Expression left , right ;
-	public Subtract(Expression left , Expression right) {
-		this.left = left ;
-		this.right= right ;
-	}
-	public int interpret(Context con){
-		return left.interpret(con) - right.interpret(con);
-	}
-}
-
-class Multiply extends Expression{
-	private Expression left , right ;
-	public Multiply(Expression left , Expression right){
-		this.left = left ;
-		this.right= right ;
-	}
-	public int interpret(Context con){
-		return left.interpret(con) * right.interpret(con);
-	}
-}
-
-class Division extends Expression{
-	private Expression left , right ;
-	public Division(Expression left , Expression right){
-		this.left = left ;
-		this.right= right ;
-	}
-	public int interpret(Context con){
-		try{
-			return left.interpret(con) / right.interpret(con);
-		}catch(ArithmeticException ae) {
-			System.out.println("被除数为0！");
-			return -11111;
-		}
-	}
-}
-
-public class DS15_Expression
-{
-	private static Expression ex ;
-	private static Context con ;
-	public static void main(String[] args){
-		con = new Context();
-		//设置变量、常量
-		Variable a = new Variable();
-		Variable b = new Variable();
-		Constant c = new Constant(2);
-		//为变量赋值
-		con.addValue(a , 5);
-		con.addValue(b , 3);
-		//运算，对句子的结构由我们自己来分析，构造
-		ex = new Division(new Multiply(a , b), new Add(new Subtract(a , b) , c));
-		System.out.println("运算结果为："+ex.interpret(con));
-	}
-}
\ No newline at end of file
diff --git a/DS16_Iterator.java b/DS16_Iterator.java
deleted file mode 100644
index 1010f73..0000000
--- a/DS16_Iterator.java
+++ /dev/null
@@ -1,113 +0,0 @@
-//Iterator
-interface Iterator {
-
-    Object next();
-    
-    void first();
-    
-    void last();
-    
-    boolean hasNext();
-}
-
-
-//ConcreteIterator
-class IteratorImpl implements Iterator {
-
-    private List list;
-    
-    private int index;
-    
-    public IteratorImpl(List list) {
-        index = 0;
-        this.list = list;
-    }
-    
-    public void first() {
-        index = 0;
-    }
-
-    public void last() {
-        index = list.getSize();
-    }
-
-    public Object next() {
-        Object obj = list.get(index);
-        index++;
-        return obj;
-    }
-
-    public boolean hasNext() {
-        return index < list.getSize();
-    }
-}
-
-//list
-interface List {
-
-    Iterator iterator();
-    
-    Object get(int index);
-    
-    int getSize();
-    
-    void add(Object obj);
-}
-
-
-//ConcreteAggregate
-class ListImpl implements List {
-
-    private Object[] list;
-    
-    private int index;
-    
-    private int size;
-    
-    public ListImpl() {
-        index = 0;
-        size = 0;
-        list = new Object[100];
-    }
-    
-    public Iterator iterator() {
-        return new IteratorImpl(this);
-    }
-    
-    public Object get(int index) {
-        return list[index];
-    }
-    
-    public int getSize() {
-        return this.size;
-    }
-    
-    public void add(Object obj) {
-        list[index++] = obj;
-        size++;
-    }
-}
-
-//
-public class DS16_Iterator{
-
-    public static void main(String[] args) {
-        List list = new ListImpl();
-        list.add("a");
-        list.add("b");
-        list.add("c");
-        //第一种迭代方式
-        Iterator it = list.iterator();
-        while (it.hasNext()) {
-            System.out.println(it.next());
-        }
-        
-        System.out.println("=====");
-        //第二种迭代方式
-        for (int i = 0; i < list.getSize(); i++) {
-            System.out.println(list.get(i));
-        }
-    }
-}
-
-
diff --git a/DS17_Mediator.java b/DS17_Mediator.java
deleted file mode 100644
index 170de07..0000000
--- a/DS17_Mediator.java
+++ /dev/null
@@ -1,64 +0,0 @@
-//Mediator 
-abstract class Mediator {
-
-    public abstract void notice(String content);
-}
-
-//ConcreteMediator
-class ConcreteMediator extends Mediator {
-
-    private ColleagueA ca;
-    
-    private ColleagueB cb;
-    
-    public ConcreteMediator() {
-        ca = new ColleagueA();
-        cb = new ColleagueB();
-    }
-    
-    public void notice(String content) {
-        if (content.equals("boss")) {
-            //老板来了, 通知员工A
-            ca.action();
-        }
-        if (content.equals("client")) {
-            //客户来了,通知前台B
-            cb.action();
-        }
-    }
-}
-
-abstract class Colleague{ 
-	public abstract void action();
-} 
-
-//Colleagueclass 
-class ColleagueA extends Colleague {
-
-    
-    public void action(){
-        System.out.println("普通员工努力工作");
-    }
-}
-
-class ColleagueB extends Colleague {
-
-    public void action() {
-        System.out.println("前台注意了!");
-    }
-}
-
-public class DS17_Mediator {
-
-    public static void main(String[] args) {
-        Mediator med = new ConcreteMediator();
-        //老板来了
-        med.notice("boss");
-        
-        //客户来了
-        med.notice("client");
-    }
-}
-
-
-
diff --git a/DS18_Memento.java b/DS18_Memento.java
deleted file mode 100644
index 0539a3d..0000000
--- a/DS18_Memento.java
+++ /dev/null
@@ -1,76 +0,0 @@
-//Memento
-class Memento {
-
-    private String state;
-
-    public Memento(String state) {
-        this.state = state;
-    }
-
-    public String getState() {
-        return state;
-    }
-
-    public void setState(String state) {
-        this.state = state;
-    }
-}
-
-
-//Or*ginator 
-class Originator {
-
-    private String state;
-
-    public String getState() {
-        return state;
-    }
-
-    public void setState(String state) {
-        this.state = state;
-    }
-    
-    public Memento createMemento() {
-        return new Memento(state);
-    }
-    
-    public void setMemento(Memento memento) {
-        state = memento.getState();
-    }
-    
-    public void showState(){
-        System.out.println(state);
-    }
-}
-
-//Caretaker
-class Caretaker {
-    
-    private Memento memento;
-    
-    public Memento getMemento(){
-        return this.memento;
-    }
-    
-    public void setMemento(Memento memento){
-        this.memento = memento;
-    }
-}
-
-//
-public class DS18_Memento{
-
-    public static void main(String[] args) {
-        Originator org = new Originator();
-        org.setState("开会中");
-        
-        Caretaker ctk = new Caretaker ();
-        ctk.setMemento(org.createMemento());//将数据封装在Caretaker
-        
-        org.setState("睡觉中");
-        org.showState();//显示
-        
-        org.setMemento(ctk.getMemento());//将数据重新导入
-        org.showState();
-    }
-}
diff --git a/DS19_Observer.java b/DS19_Observer.java
deleted file mode 100644
index 6bf3634..0000000
--- a/DS19_Observer.java
+++ /dev/null
@@ -1,118 +0,0 @@
-//Subject 
-import java.util.*;
-
-abstract class Citizen {
-    
-    ArrayList pols;
-    
-    String help = "normal";
-    
-    public void setHelp(String help) {
-        this.help = help;
-    }
-    
-    public String getHelp() {
-        return this.help;
-    }
-    
-    abstract void sendMessage(String help);
-
-    public void setPolicemen() {
-        this.pols = new ArrayList();
-    }
-    
-    public void register(Policeman pol) {
-        this.pols.add(pol);
-    }
-
-    public void unRegister(Policeman pol) {
-        this.pols.remove(pol);
-    }
-}
-
-//Observer 
-interface Policeman {
-
-    void action(Citizen ci);
-}
-
-//ConcreteSubjec
-class HuangPuCitizen extends Citizen {
-
-    public HuangPuCitizen(Policeman pol) {
-        setPolicemen();
-        register(pol);
-    }
-    
-    public void sendMessage(String help) {
-        setHelp(help);
-        for(int i = 0; i < pols.size(); i++) {
-            Policeman pol = (Policeman)pols.get(i);
-            //通知警察行动
-            pol.action(this);
-        }
-    }
-}
-
-class TianHeCitizen extends Citizen {
-
-    public TianHeCitizen(Policeman pol) {
-        setPolicemen();
-        register(pol);
-    }
-    
-    public void sendMessage(String help) {
-        setHelp(help);
-        for (int i = 0; i < pols.size(); i++) {
-            Policeman pol = (Policeman)pols.get(i);
-            //通知警察行动
-            pol.action(this);
-        }
-    }
-}
-
-//ConcreteObserver 
-class HuangPuPoliceman implements Policeman {
-
-    public void action(Citizen ci) {
-       String help = ci.getHelp();
-        if (help.equals("normal")) {
-            System.out.println("一切正常, 不用出动");
-        }
-        if (help.equals("unnormal")) {
-            System.out.println("有犯罪行为, 黄埔警察出动!");
-        }
-    }
-}
-
-class TianHePoliceman implements Policeman {
-
-    public void action(Citizen ci) {
-        String help = ci.getHelp();
-        if (help.equals("normal")) {
-            System.out.println("一切正常, 不用出动");
-        }
-        if (help.equals("unnormal")) {
-            System.out.println("有犯罪行为, 天河警察出动!");
-        }
-    }
-}
-
-public class DS19_Observer{
-
-    public static void main(String[] args) {
-        Policeman thPol = new TianHePoliceman();
-        Policeman hpPol = new HuangPuPoliceman();
-        
-        Citizen citizen = new HuangPuCitizen(hpPol);
-		citizen.register(thPol);
-        citizen.sendMessage("unnormal");
-        citizen.sendMessage("normal");
-        
-        System.out.println("===========");
-        
-        citizen = new TianHeCitizen(thPol);
-        citizen.sendMessage("normal");
-        citizen.sendMessage("unnormal");
-    }
-}
diff --git a/DS20_Stategy.java b/DS20_Stategy.java
deleted file mode 100644
index ccda9be..0000000
--- a/DS20_Stategy.java
+++ /dev/null
@@ -1,56 +0,0 @@
-//Strategy
-abstract class Strategy {
-
-    public abstract void method();
-}
-
-//ConcreteStrategy
-class strategyImplA extends Strategy {
-
-    public void method() {
-        System.out.println("这是第一个实现");
-    }
-}
-
-class StrategyImplB extends Strategy {
-
-    public void method() {
-        System.out.println("这是第二个实现");
-    }
-}
-
-class StrategyImplC extends Strategy {
-
-    public void method() {
-        System.out.println("这是第三个实现");
-    }
-}
-
-//Context 
-class Context {
-
-    Strategy stra;
-    
-    public Context(Strategy stra) {
-        this.stra = stra;
-    }
-    
-    public void doMethod() {
-        stra.method();
-    }
-}
-
-
-public class DS20_Stategy {
-    
-    public static void main(String[] args) {
-        Context ctx = new Context(new strategyImplA());
-        ctx.doMethod();
-        
-        ctx = new Context(new StrategyImplB());
-        ctx.doMethod();
-        
-        ctx = new Context(new StrategyImplC());
-        ctx.doMethod();
-    }
-}
diff --git a/DS21_State.java b/DS21_State.java
deleted file mode 100644
index 2566b46..0000000
--- a/DS21_State.java
+++ /dev/null
@@ -1,55 +0,0 @@
-//Context
-class Context {
-
-    private Weather weather;
-
-    public void setWeather(Weather weather) {
-        this.weather = weather;
-    }
-
-    public Weather getWeather() {
-        return this.weather;
-    }
-
-    public String weatherMessage() {
-        return weather.getWeather();
-    }
-}
-//state
-interface Weather {
-
-    String getWeather();
-}
-
-
-//Concrete*tatesubclasses 
-
-class Rain implements Weather {
-
-    public String getWeather() {
-        return "下雨";
-    }
-}
-
-class Sunshine implements Weather {
-
-    public String getWeather() {
-        return "阳光";
-    }
-}
-
-
-class DS21_State{
-
-    public static void main(String[] args) {
-        Context ctx1 = new Context();
-        ctx1.setWeather(new Sunshine());
-        System.out.println(ctx1.weatherMessage());
-
-        System.out.println("===============");
-
-        Context ctx2 = new Context();
-        ctx2.setWeather(new Rain());
-        System.out.println(ctx2.weatherMessage());
-    }
-}
diff --git a/DS22_Template.java b/DS22_Template.java
deleted file mode 100644
index 22fee27..0000000
--- a/DS22_Template.java
+++ /dev/null
@@ -1,29 +0,0 @@
-abstract class Template {
-
-    public abstract void print();
-    
-    public void update() {
-        System.out.println("开始打印");
-        for (int i = 0; i < 10; i++) {
-            print();
-        }
-    }
-}
-//ConcreteClass 
-
-class TemplateConcrete extends Template {
-
-    //@*verride
-    public void print() {
-        System.out.println("这是子类的实现");
-    }
-}
-//Test 
-
-public class DS22_Template {
-
-    public static void main(String[] args) {
-        Template temp = new TemplateConcrete();
-        temp.update();
-    }
-}
diff --git a/DS23_Visitor.java b/DS23_Visitor.java
deleted file mode 100644
index c5698c8..0000000
--- a/DS23_Visitor.java
+++ /dev/null
@@ -1,99 +0,0 @@
-//Visitor
-//不是很理解这个有问题
-import java.util.*;
-
-interface Visitor {
-
-    public void visitString(StringElement stringE);
-    
-    public void visitFloat(FloatElement floatE);
-    
-    public void visitCollection(Collection collection); 
-}
-
-//ConcreteVisitor 
-class ConcreteVisitor implements Visitor {
-
-    public void visitCollection(Collection collection) {
-        // TODO Auto-generated method stub
-        Iterator iterator = (Iterator)collection.iterator();
-        while (iterator.hasNext()) {
-            Object o = iterator.next();
-            if (o instanceof Visitable) {
-                ((Visitable)o).accept(this);
-            }
-        }
-    }
-
-    public void visitFloat(FloatElement floatE) {
-        System.out.println(floatE.getFe());
-    }
-
-    public void visitString(StringElement stringE) {
-        System.out.println(stringE.getSe());
-    }
-}
-
-//Element
-interface Visitable {
-
-    public void accept(Visitor visitor);
-}
-
-
-//ConcreteElement
-class FloatElement implements Visitable {
-
-    private Float fe;
-    
-    public FloatElement(Float fe) {
-        this.fe = fe;
-    }
-    
-    public Float getFe() {
-        return this.fe;
-    }
-    
-    public void accept(Visitor visitor) {
-        visitor.visitFloat(this);
-    }
-}
-
-class StringElement implements Visitable {
-
-    private String se;
-    
-    public StringElement(String se) {
-        this.se = se;
-    }
-    
-    public String getSe() {
-        return this.se;
-    }
-    
-    public void accept(Visitor visitor) {
-        visitor.visitString(this);
-    }
-}
-
-public class DS23_Visitor{
-
-    public static void main(String[] args) {
-        Visitor visitor = new ConcreteVisitor();
-        StringElement se = new StringElement("abc");
-        se.accept(visitor);
-        
-        FloatElement fe = new FloatElement(new Float(1.5));
-        fe.accept(visitor);
-        System.out.println("===========");
-        List result = new ArrayList();
-        result.add(new StringElement("abc"));
-        result.add(new StringElement("abc"));
-        result.add(new StringElement("abc"));
-        //result.add(new FloatElement(new Float(1.5)));
-       // result.add(new FloatElement(new Float(1.5)));
-        //result.add(new FloatElement(new Float(1.5)));
-        visitor.visitCollection(result);
-    }
-}
-
diff --git a/DS23_Visitor_2.java b/DS23_Visitor_2.java
deleted file mode 100644
index c5698c8..0000000
--- a/DS23_Visitor_2.java
+++ /dev/null
@@ -1,99 +0,0 @@
-//Visitor
-//不是很理解这个有问题
-import java.util.*;
-
-interface Visitor {
-
-    public void visitString(StringElement stringE);
-    
-    public void visitFloat(FloatElement floatE);
-    
-    public void visitCollection(Collection collection); 
-}
-
-//ConcreteVisitor 
-class ConcreteVisitor implements Visitor {
-
-    public void visitCollection(Collection collection) {
-        // TODO Auto-generated method stub
-        Iterator iterator = (Iterator)collection.iterator();
-        while (iterator.hasNext()) {
-            Object o = iterator.next();
-            if (o instanceof Visitable) {
-                ((Visitable)o).accept(this);
-            }
-        }
-    }
-
-    public void visitFloat(FloatElement floatE) {
-        System.out.println(floatE.getFe());
-    }
-
-    public void visitString(StringElement stringE) {
-        System.out.println(stringE.getSe());
-    }
-}
-
-//Element
-interface Visitable {
-
-    public void accept(Visitor visitor);
-}
-
-
-//ConcreteElement
-class FloatElement implements Visitable {
-
-    private Float fe;
-    
-    public FloatElement(Float fe) {
-        this.fe = fe;
-    }
-    
-    public Float getFe() {
-        return this.fe;
-    }
-    
-    public void accept(Visitor visitor) {
-        visitor.visitFloat(this);
-    }
-}
-
-class StringElement implements Visitable {
-
-    private String se;
-    
-    public StringElement(String se) {
-        this.se = se;
-    }
-    
-    public String getSe() {
-        return this.se;
-    }
-    
-    public void accept(Visitor visitor) {
-        visitor.visitString(this);
-    }
-}
-
-public class DS23_Visitor{
-
-    public static void main(String[] args) {
-        Visitor visitor = new ConcreteVisitor();
-        StringElement se = new StringElement("abc");
-        se.accept(visitor);
-        
-        FloatElement fe = new FloatElement(new Float(1.5));
-        fe.accept(visitor);
-        System.out.println("===========");
-        List result = new ArrayList();
-        result.add(new StringElement("abc"));
-        result.add(new StringElement("abc"));
-        result.add(new StringElement("abc"));
-        //result.add(new FloatElement(new Float(1.5)));
-       // result.add(new FloatElement(new Float(1.5)));
-        //result.add(new FloatElement(new Float(1.5)));
-        visitor.visitCollection(result);
-    }
-}
-
diff --git a/README.md b/README.md
index d68ae5a..047e43a 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,2 @@
 # Java-Design-Patterns
-Base On GOF‘s Design Pattern,Implemented by Java.
-基于GOF's的设计模式，通过Java语言实现23个设计模式。
+Base on GOF‘s Design Pattern,A total of 23 design patters are included，Implemented by Java.