求教 关于Java1.8下 浅Clone与深Clone的区别

Question

/**

• */ package bean;

import java.math.BigDecimal;
import java.util.Date;

/**

• @author hb
  *
  /
  public class JavaBean extends Bean implements Cloneable {
  /

  • 氏名 / private String Name; /
  • 年月日 / private Date birthday; /
  • アカウント / private String account; /
  • パスワード / private String password; /
  • 住所 */ private String[] address;

  /**

  • @return the name */ public String getName() { return Name; }

  /**

  • @param name
  • the name to set */ public void setName(String name) { Name = name; }

  /**

  • @return the birthday */ public Date getBirthday() { return birthday; }

  /**

  • @param birthday
  • the birthday to set */ public void setBirthday(Date birthday) { this.birthday = birthday; }

  /**

  • @return the account */ public String getAccount() { return account; }

  /**

  • @param account
  • the account to set */ public void setAccount(String account) { this.account = account; }

  /**

  • @return the password */ public String getPassword() { return password; }

  /**

  • @param password
  • the password to set */ public void setPassword(String password) { this.password = password; }

  /**

  • @return the address */ public String[] getAddress() { return address; }

  /**

  • @param address the address to set */ public void setAddress(String[] address) { this.address = address; }

  @Override
  protected Object clone() throws CloneNotSupportedException{
  JavaBean bean = (JavaBean) super.clone();
  return bean;
  }

  public static void main(String[] args) throws Exception {
  JavaBean bean = new JavaBean();
  bean.setSn(new BigDecimal(1));
  bean.setName("123");
  bean.setAddress(new String[]{"China","Shanghai","Pudong"});

  JavaBean cbean = (JavaBean) bean.clone();
  cbean.setSn(new BigDecimal(2));
  cbean.setName("456");
  cbean.setAddress(new String[]{"US","NewYork","NewYork"});
  
  System.out.println(bean);
  System.out.println(cbean);
  
  System.out.println(bean.getSn());
  System.out.println(cbean.getSn());
  
  System.out.println(bean.getName().hashCode()+":"+bean.getName());
  System.out.println(cbean.getName().hashCode()+":"+cbean.getName());
  
  System.out.println(bean.getAddress().hashCode()+":"+bean.getAddress()[0]);
  System.out.println(cbean.getAddress().hashCode()+":"+cbean.getAddress()[0]);
  

  }
  }

小弟最近在学习Java1.8下 关于浅Clone与深Clone的区别。发现有一些与以前不同的地方 感觉已经没有浅Clone这一说法 重载Clone方法后 对Clone后的对象方法赋值 已经不会改变原Clone对象 难道在Java1.8中取消了浅Clone？请各位大神指点

Answer 1

你这个验证做的有问题，基本类型深浅克隆都不会改变原对象的值，你可以在你的JavaBean里面再加一个对象的变量，然后验证下是否给这个对象的字段赋值会改变原对象里同样的值