标签:java
一.序列化:
把对象写到流里面的过程是序列化,而把对象从流中读出来的过程叫做反序列化。在java中实现深克隆对象,常常可以先使对象实现Serializable接口,然后把对象写到一个流里面,然后再从流中读取出来,便可以重建对象。
二.序列化实现:
<strong><span style="font-size:14px;">public class Main { public static void main(String[] args) throws Exception { Teacher3 t = new Teacher3(); t.setAge(40); t.setName("Teacher Zhang"); Student3 s1 = new Student3(); s1.setAge(20); s1.setName("zhangsan"); s1.setTeacher(t); Student3 s2 = (Student3)s1.deepCopy(); System.out.println(s2.getAge()); System.out.println(s2.getName()); System.out.println("-----------------------"); System.out.println(s2.getTeacher().getAge()); System.out.println(s2.getTeacher().getName()); s2.getTeacher().setAge(50); s2.getTeacher().setName("Teacher Li"); System.out.println(s1.getTeacher().getAge()); System.out.println(s1.getTeacher().getName()); } } class Teacher3 implements Serializable { private int age; private String name; public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } } class Student3 implements Serializable { private int age; private String name; private Teacher3 teacher; public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Teacher3 getTeacher() { return teacher; } public void setTeacher(Teacher3 teacher) { this.teacher = teacher; } public Object deepCopy() throws Exception { ByteArrayOutputStream bos = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream(bos); oos.writeObject(this); ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray()); ObjectInputStream ois = new ObjectInputStream(bis); return ois.readObject(); } }</span></strong>
打印:
20
zhangsan
-----------------------
40
Teacher Zhang
40
Teacher Zhang
三.serialVersionUID含义:
serialVersionUID是为了让该类别Serializable向后兼容。例如当你的对象序列化后存到硬盘上面后,可是后来更改了类的field(增加或减少),当你反序列化时,就会出现Exception的,这样就会造成不兼容性的问题。但当serialVersionUID相同时,它就会将不一样的field以type的缺省值Deserialize,这个可以避开不兼容性的问题。
标签:java
原文地址:http://blog.csdn.net/u010708662/article/details/45129765