public class AlerDialog {private  String title;private  String message;public AlerDialog(Builder builder) {
//        View.inflate()this.title = builder.title;this.message = builder.message;}public static class Builder {private  String title;private  String message;public  Builder setTitle(String title) {this.title = title;return this;}public   Builder setMessage(String message) {this.message = message;return this;}public  AlerDialog build() {return new AlerDialog(this);}}
}new AlerDialog.Builder().setTitle("").setMessage("").build();

public interface Target {void sampleOperation1();void sampleOperation2();
}
public class Adaptee {public void sampleOperation1() {System.out.println("sampleOperation1");}
}
public class Adapter extends Adaptee implements Target {@Overridepublic void sampleOperation2() {System.out.println("sampleOperation2");}}
public class MyClass {public static void main(String[] args) {Adapter adapter = new Adapter();adapter.sampleOperation1();adapter.sampleOperation2();}
}

public interface Target {void sampleOperation1();void sampleOperation2();
}public class Adaptee {public void sampleOperation1() {System.out.println("sampleOperation1");}
}public class Adapter implements Target {private Adaptee mAdaptee;public Adapter(Adaptee adaptee) {mAdaptee = adaptee;}@Overridepublic void sampleOperation1() {mAdaptee.sampleOperation1();}@Overridepublic void sampleOperation2() {System.out.println("sampleOperation2");}}public class MyClass {public static void main(String[] args) {Adapter adapter =new Adapter(new Adaptee());adapter.sampleOperation1();adapter.sampleOperation2();}
}

/*** subject（抽象主题角色）：* 真实主题与代理主题的共同接口。*/
interface Subject {void sellBook();
}/*** ReaISubject（真实主题角色）：* 定义了代理角色所代表的真实对象。*/
public class RealSubject implements Subject {@Overridepublic void sellBook() {System.out.println("出版社卖书");}
}/*** Proxy（代理主题角色）：* 含有对真实主题角色的引用，代理角色通常在将客* 户端调用传递给真实主题对象之前或者之后执行某些* 操作，而不是单纯返回真实的对象。*/
public class ProxySubject implements Subject {private RealSubject realSubject;@Overridepublic void sellBook() {if (realSubject == null) {realSubject = new RealSubject();}sale();realSubject.sellBook();give();}public void sale() {System.out.println("打折");}public void give() {System.out.println("送优惠券");}
}public class Main {public static void main(String[] args) {//静态代理（我们自己静态定义的代理类)ProxySubject proxySubject = new ProxySubject();proxySubject.sellBook();//动态代理(通过程序动态生成代理类，该代理类不是我们自己定义的。而是由程序自动生成)RealSubject realSubject = new RealSubject();MyHandler myHandler = new MyHandler();myHandler.setProxySubject(realSubject);Subject subject = (Subject) Proxy.newProxyInstance(realSubject.getClass().getClassLoader(),realSubject.getClass().getInterfaces(), myHandler);subject.sellBook();}
}public class MyHandler implements InvocationHandler {private RealSubject realSubject;public void setProxySubject(RealSubject realSubject) {this.realSubject = realSubject;}/*** @param proxy  　指代我们所代理的那个真实对象* @param method   指代的是我们所要调用真实对象的某个方法的Method对象* @param args   　指代的是调用真实对象某个方法时接受的参数* @return* @throws Throwable*/@Overridepublic Object invoke(Object proxy, Method method, Object[] args) throws Throwable {sale();proxy = method.invoke(realSubject, args);give();return proxy;}public void sale() {System.out.println("打折");}public void give() {System.out.println("送优惠券");}
}

public class FlyWeight {static class MyString {private String myChar;public MyString(String myChar) {this.myChar = myChar;}public void display() {System.out.println(myChar);}}static class MyCharacterFactory {private Map<String, MyString> pool;public MyCharacterFactory() {pool = new HashMap<>();}public MyString getMyCharacte(String strig) {MyString myString = pool.get(strig);if (myString == null) {myString = new MyString(strig);pool.put(strig, myString);}return myString;}}public static void main(String[] args) {MyCharacterFactory myCharacterFactory = new MyCharacterFactory();MyString a = myCharacterFactory.getMyCharacte("a");MyString b = myCharacterFactory.getMyCharacte("b");MyString a1 = myCharacterFactory.getMyCharacte("a");MyString d = myCharacterFactory.getMyCharacte("d");if (a == a1) {System.out.println("true");}}
}