1.序列化实现

public class CloneUtils { @SuppressWarnings("unchecked") public static <T extends Serializable> T clone(T object){ T cloneObj = null; try { ByteArrayOutputStream out = new ByteArrayOutputStream(); ObjectOutputStream obs = new ObjectOutputStream(out); obs.writeObject(object); obs.close(); ByteArrayInputStream ios = new ByteArrayInputStream(out.toByteArray()); ObjectInputStream ois = new ObjectInputStream(ios); cloneObj = (T) ois.readObject(); }catch (Exception e){ e.printStackTrace(); } return cloneObj; }}

2.主代码

public class TestString { public static void main(String[] args) { TestString test = new TestString(); System.out.println("-------浅拷贝---------"); test.qianCopyTest(); System.out.println(); System.out.println("--------使用clone深拷贝--------"); test.defaultCloneTest(); System.out.println(); System.out.println("--------使用序列化实现对象的拷贝--------"); test.streamClonrTest(); System.out.println("--------耗时对比--------"); System.out.println("耗时1 : "+ test.qianCopyCost()); System.out.println("耗时2 : "+ test.CloneCopyCost()); System.out.println("耗时3 : "+ test.StreamCopyCost()); } private void qianCopyTest() { String s = "cd"; change(s); System.out.println(s); System.out.println("----------------"); String b = new String("cd"); change(b); System.out.println(b); System.out.println("----------------"); int me = 1; change(me); System.out.println(me); System.out.println("----------------"); Person person = new Person("我", 13,new Email("我")); change(person); System.out.println(person.toString()); } private void defaultCloneTest(){ Person person = new Person("我", 13,new Email("我")); Person person1 = person.clone(); Person person2 = person.clone(); System.out.println("person : 【"+person+"】"); System.out.println("person1 : 【"+person1+"】"); System.out.println("person2 : 【"+person2+"】"); //改一个就会触动全部！！ 这就是使用默认的clone方法的弊端 person.getEmail().setContent("你"); System.out.println("之后的person : 【"+person+"】"); System.out.println("之后的person1 : 【"+person1+"】"); System.out.println("之后的person2 : 【"+person2+"】"); } private void streamClonrTest(){ Person person = new Person("我", 13,new Email("我")); Person person1 = CloneUtils.clone(person); Person person2 = CloneUtils.clone(person); System.out.println("person : 【"+person+"】"); System.out.println("person1 : 【"+person1+"】"); System.out.println("person2 : 【"+person2+"】"); person.getEmail().setContent("你"); System.out.println("之后的person : 【"+person+"】"); System.out.println("之后的person1 : 【"+person1+"】"); System.out.println("之后的person2 : 【"+person2+"】"); } private static void change(String x) { x = "ab"; } private static void change(int x) { x = 2; } private static void change(Person x) { x = new Person("你", 20, new Email("你")); } private long qianCopyCost(){ long start = System.currentTimeMillis(); Person person = new Person("我", 13,new Email("我")); List<Person> list = new ArrayList<>(); for(int i = 0;i<=10000;i++){ list.add(new Person("你", 20, new Email("你"))); } return System.currentTimeMillis()-start; } private long CloneCopyCost(){ long start = System.currentTimeMillis(); Person person = new Person("我", 13,new Email("我")); List<Person> list = new ArrayList<>(); for(int i = 0;i<=10000;i++){ list.add(person.clone()); } return System.currentTimeMillis()-start; } private long StreamCopyCost(){ long start = System.currentTimeMillis(); Person person = new Person("我", 13,new Email("我")); List<Person> list = new ArrayList<>(); for(int i = 0;i<=10000;i++){ list.add(CloneUtils.clone(person)); } return System.currentTimeMillis()-start; }}class Person implements Serializable, Cloneable { private static final long serialVersionUID = -8584225043397465132L; private String name; private int age; public void setEmail(Email email) { this.email = email; } private Email email; public Email getEmail() { return email; } public void setName(String name) { this.name = name; } public void setAge(int age) { this.age = age; } public Person(String name, int age, Email email) { this.name = name; this.age = age; this.email = email; } @Override public String toString() { return "name : " + name + " | age : " + age +" | content : "+email.getContent(); } @Override protected Person clone() { Person person = null; try { person = (Person) super.clone(); person.setEmail(new Email(person.getEmail().getContent())); } catch (CloneNotSupportedException e) { e.printStackTrace(); } return person; }}class Email implements Serializable { private static final long serialVersionUID = 1426052929769365539L; private String content; public void setContent(String content) { this.content = content; } public String getContent() { return content; } public Email(String content) { this.content = content; }}

测试了一下时间：
输出：
-------浅拷贝---------
cd

cd

1

name : 我 | age : 13 | content : 我

--------使用clone深拷贝--------
person : 【name : 我 | age : 13 | content : 我】
person1 : 【name : 我 | age : 13 | content : 我】
person2 : 【name : 我 | age : 13 | content : 我】
之后的person : 【name : 我 | age : 13 | content : 你】
之后的person1 : 【name : 我 | age : 13 | content : 我】
之后的person2 : 【name : 我 | age : 13 | content : 我】

--------使用序列化实现对象的拷贝--------
person : 【name : 我 | age : 13 | content : 我】
person1 : 【name : 我 | age : 13 | content : 我】
person2 : 【name : 我 | age : 13 | content : 我】
之后的person : 【name : 我 | age : 13 | content : 你】
之后的person1 : 【name : 我 | age : 13 | content : 我】
之后的person2 : 【name : 我 | age : 13 | content : 我】
--------耗时对比--------
耗时1 : 2
耗时2 : 1
耗时3 : 338

以上所述是小编给大家介绍的java中的深拷贝和浅拷贝（clone()方法的重写、使用序列化实现真正的深拷贝）详解整合，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！