//實(shí)現(xiàn)Cloneable 接口的原型抽象類Prototype
   class Prototype implements Cloneable {
        //重寫(xiě)clone方法
        public Prototype clone(){
            Prototype prototype = null;
            try{
                prototype = (Prototype)super.clone();
            }catch(CloneNotSupportedException e){
                e.printStackTrace();
            }
            return prototype;
        }
    }
    //實(shí)現(xiàn)原型類
    class ConcretePrototype extends Prototype{
        public void show(){
            System.out.println("原型模式實(shí)現(xiàn)類");
        }
    }
    public class Client {
        public static void main(String[] args){
            ConcretePrototype cp = new ConcretePrototype();
            for(int i=0; i< 10; i++){
                ConcretePrototype clonecp = (ConcretePrototype)cp.clone();
                clonecp.show();
            }
        }
    }

class Student {
    private String name;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name= name;
    }
}
public class Test {
    public static void main(String args[]) {
        Student stu1 = new Student();
        stu1.setName("test1");
        Student stu2 = stu1;
        stu2.setName("test2");
        System.out.println("學(xué)生1:" + stu1.getName());
        System.out.println("學(xué)生2:" + stu2.getName());
    }
}

//學(xué)生類實(shí)現(xiàn)Cloneable接口
class Student implements Cloneable{
    private String name;  //姓名
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name= name;
    }
   //重寫(xiě)clone方法
   public Student clone() {
        Student student = null;
        try {
            student = (Student) super.clone();
            } catch (CloneNotSupportedException e) {
            e.printStackTrace();
            }
            return student;
   }
}
public class Test {
    public static void main(String args[]) {
        Student stu1 = new Student();  //創(chuàng)建學(xué)生1
        stu1.setName("test1");
        Student stu2 = stu1.clone();  //通過(guò)克隆創(chuàng)建學(xué)生2
        stu2.setName("test2");
        System.out.println("學(xué)生1:" + stu1.getName());
        System.out.println("學(xué)生2:" + stu2.getName());
    }
}

//定義學(xué)生類
class Student implements Cloneable{
    private String name; //學(xué)生姓名
    private Teacher teacher; //定義老師類
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Teacher getTeacher() {
        return teacher;
    }
    public void setTeacher(Teacher teacher) {
        this.teacher = teacher;
    }
   //重寫(xiě)克隆方法
   public Student clone() {
        Student student = null;
        try {
            student = (Student) super.clone();
            } catch (CloneNotSupportedException e) {
            e.printStackTrace();
            }
            return student;
   }
}
//定義老師類
class Teacher implements Cloneable{
    private String name;  //老師姓名
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name= name;
    }
   //重寫(xiě)克隆方法，對(duì)老師類進(jìn)行克隆
   public Teacher clone() {
        Teacher teacher= null;
        try {
            teacher= (Teacher) super.clone();
            } catch (CloneNotSupportedException e) {
            e.printStackTrace();
            }
            return student;
   }
}
public class Test {
    public static void main(String args[]) {
        Teacher teacher = new Teacher (); //定義老師1
        teacher.setName("劉老師");
        Student stu1 = new Student();  //定義學(xué)生1
        stu1.setName("test1");
        stu1.setTeacher(teacher);
        Student stu2 = stu1.clone(); //定義學(xué)生2
        stu2.setName("test2");
        stu2.getTeacher().setName("王老師");//修改老師
        System.out.println("學(xué)生" + stu1.getName + "的老師是:" + stu1.getTeacher().getName);
        System.out.println("學(xué)生" + stu1.getName + "的老師是:" + stu2.getTeacher().getName);
    }
}

public Student clone() {
        Student student = null;
        try {
            student = (Student) super.clone();
            Teacher teacher = this.teacher.clone();//克隆teacher對(duì)象
            student.setTeacher(teacher);
            } catch (CloneNotSupportedException e) {
            e.printStackTrace();
            }
            return student;
   }

for(int i=0; i<list.size(); i++){
  Student stu = new Student();
  ...
}

Student stu = new Student();
for(int i=0; i<list.size(); i++){
 Student stu1 = (Student)stu.clone();
  ...
}

//抽象享元類
interface Flyweight {
    //對(duì)外狀態(tài)對(duì)象
    void operation(String name);
    //對(duì)內(nèi)對(duì)象
    String getType();
}

//具體享元類
class ConcreteFlyweight implements Flyweight {
    private String type;
    public ConcreteFlyweight(String type) {
        this.type = type;
    }
    @Override
    public void operation(String name) {
        System.out.printf("[類型(內(nèi)在狀態(tài))] - [%s] - [名字(外在狀態(tài))] - [%s]\n", type, name);
    }
    @Override
    public String getType() {
        return type;
    }
}

//享元工廠類
class FlyweightFactory {
    private static final Map<String, Flyweight> FLYWEIGHT_MAP = new HashMap<>();//享元池，用來(lái)存儲(chǔ)享元對(duì)象
    public static Flyweight getFlyweight(String type) {
        if (FLYWEIGHT_MAP.containsKey(type)) {//如果在享元池中存在對(duì)象，則直接獲取
            return FLYWEIGHT_MAP.get(type);
        } else {//在響應(yīng)池不存在，則新創(chuàng)建對(duì)象，并放入到享元池
            ConcreteFlyweight flyweight = new ConcreteFlyweight(type);
            FLYWEIGHT_MAP.put(type, flyweight);
            return flyweight;
        }
    }
}

public class Client {
    public static void main(String[] args) {
        Flyweight fw0 = FlyweightFactory.getFlyweight("a");
        Flyweight fw1 = FlyweightFactory.getFlyweight("b");
        Flyweight fw2 = FlyweightFactory.getFlyweight("a");
        Flyweight fw3 = FlyweightFactory.getFlyweight("b");
        fw1.operation("abc");
        System.out.printf("[結(jié)果(對(duì)象對(duì)比)] - [%s]\n", fw0 == fw2);
        System.out.printf("[結(jié)果(內(nèi)在狀態(tài))] - [%s]\n", fw1.getType());
    }
}

String s1 = "hello";
 String s2 = "hello";
 System.out.println(s1==s2);//true