public class AdvTemplate {
 private String advSubject = "XX银行抽奖活动";  //广告名称
 private String advContext = "只要刷卡就就送你10Q币"; //广告内容
 public String getAdvSubject() {
  return advSubject;
 }
 public String getAdvContext() {
  return advContext;
 }
}

public class Mail implements Cloneable{
 
 private String receiver;
 private String subject;
 private String appellation;
 private String context;
 private String tail;
 
 public Mail(AdvTemplate advTemplate){
  this.context=advTemplate.getAdvContext();
  this.subject=advTemplate.getAdvSubject();
 }

 @Override
 protected Mail clone(){
  Mail mail=null;
  try {
   mail=(Mail) super.clone();
  } catch (CloneNotSupportedException e) {
   e.printStackTrace();
  }
  return mail;
 }
 
 
 public String getReceiver() {
  return receiver;
 }

 public void setReceiver(String receiver) {
  this.receiver = receiver;
 }

 public String getSubject() {
  return subject;
 }

 public void setSubject(String subject) {
  this.subject = subject;
 }

 public String getAppellation() {
  return appellation;
 }

 public void setAppellation(String appellation) {
  this.appellation = appellation;
 }

 public String getContext() {
  return context;
 }

 public void setContext(String context) {
  this.context = context;
 }

 public String getTail() {
  return tail;
 }

 public void setTail(String tail) {
  this.tail = tail;
 }
}

public class ClientI {
 private static int MAX_COUNT=6;
  
 public static void main(String[] args) {
  int i=0;
  Mail mail=new Mail(new AdvTemplate());
  mail.setTail("XX银行版权所有");
  while(i<MAX_COUNT){
   Mail cloneMail=mail.clone();   //在这里拷贝
   cloneMail.setAppellation(getRandString(5)+"先生(女生)");
   cloneMail.setReceiver(getRandString(5)+"@"+getRandString(8)+".com");
   sendMail(cloneMail);
   i++;
  }
 }
 
 private static void sendMail(Mail mail) {
  System.out.println("标题:"+mail.getSubject()+"\t 收件人:"+mail.getReceiver()+"发送成功!");
 }

 private static String getRandString(int maxLength){
  String source="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
  StringBuffer sb=new StringBuffer();
  Random random=new Random();
  for(int i=0;i<maxLength;i++){
   sb.append(source.charAt(random.nextInt(source.length())));
  }
  return sb.toString();
 }
}

特点

public class Thing implements Cloneable{
 private ArrayList<String> list=new ArrayList<String>();
 
 public Thing(){
  System.out.println("执行了构造方法");
 }
 /*浅拷贝:俩个对象共享了一个私有变量，指向原生对象的内部元素地址,不安全
  *深拷贝:thing.list=(ArrayList<String>) this.list.clone();
  *满足俩个条件时才不会被拷贝:1.类的成员变量    2.必须是一个可变的引用对象，而不是一个原始类型或不可变对象
  */
 @Override
 protected Thing clone(){
  Thing thing=null;
  try {
   thing=(Thing) super.clone();
   thing.list=(ArrayList<String>) this.list.clone();
  //没有这句的结果不一样
  } catch (CloneNotSupportedException e) {
   e.printStackTrace();
  }
  return thing;
 }
 
 public void setValue(String value){
  list.add(value);
 }
 
 public ArrayList<String> getValue(){
  return this.list;
 }
}

 public static void main(String[] args) {
   Thing thing=new Thing();
   thing.setValue("LOL");
   Thing thingClone=thing.clone();
   thingClone.setValue("CF");
   System.out.println(thing.getValue());
 }
}

性能优良

使用场景

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