【JAVA产生对象的几种方式】

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

/**
?* java生成对象的几种方式
?*?? 1、new
?*?? 2、反射
?*????? Class.forName
?*????? 类.class
?*????? 对象.getClass()
?*?? 3、clone
?*????? 必须实现Cloneable接口,实现protected Object clone()方法
?*?? 4、序列化

?????? 1.概念

??　　?? 序列化：把Java对象转换为字节序列的过程。
??　　? 反序列化：把字节序列恢复为Java对象的过程。

?????? ?2.用途

??　　对象的序列化主要有两种用途：
??　　1） 把对象的字节序列永久地保存到硬盘上，通常存放在一个文件中；
??　　2） 在网络上传送对象的字节序列。

?* @author Administrator

?*/
public class Demo1 {

?/**
? * @param args
? * @throws Exception
? */
?public static void main(String[] args) throws Exception {
???? //一、使用new?

??? ?Student s = new Student();
????? s.print();
??
?? //二、使用反射?
??Class c = Class.forName("Student");
??Student c1=(Student)c.newInstance();
??c1.print();
??
??System.out.println("1、通过类本身获得对象");
?? Class clazz = Student.class;
?? Student s11=(Student)clazz.newInstance();
?? s11.print();
??
?? Student student1 = new Student();
?? clazz = student1.getClass();
?? Student s12=(Student)clazz.newInstance();
?? s12.print();

?

?//三、使用clone

??/**
?? * implements Cloneable
?? * protected Object clone()
?? */
??Student s1 = (Student) s.clone();
??s1.print();
//??Exception in thread "main" java.lang.CloneNotSupportedException:
??
??
?? //四、使用Serializable?
??System.out.println(" 序列化对象 ");
?? //序列化对象
??????? ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("C:\\objectFile.obj"));
??????? Student student = new Student();???
??????? out.writeObject(student);??? //写入student对象
??????? out.close();
???????
??????? System.out.println(" 反序列化对象 ");
??????? //反序列化对象
??????? ObjectInputStream in = new ObjectInputStream(new FileInputStream("C:\\objectFile.obj"));
??????? Student obj3 = (Student) in.readObject();
??????? obj3.print();
??????? in.close();
?}

}

?

?

-----------------------------------

?

import java.io.Serializable;

public class Student implements Serializable{
?private String id;
?
?private String name;
?
?private int age;

?public Student(){
??System.out.println(" Student Constructor");
?}
?
?public void print() {
??System.out.println(" Student print method called!!!!");
?}
?
?@Override
?protected Object clone() throws CloneNotSupportedException {
??// TODO Auto-generated method stub
??return super.clone();
?}
?public Student(String id, String name, int age) {
??super();
??this.id = id;
??this.name = name;
??this.age = age;
??System.out.println(" Student(id,name,age) Constructor");
?}

?public String getId() {
??return id;
?}

?public void setId(String id) {
??this.id = id;
?}

?public String getName() {
??return name;
?}

?public void setName(String name) {
??this.name = name;
?}

?public int getAge() {
??return age;
?}

?public void setAge(int age) {
??this.age = age;
?}
?
?
?
?
?
}

【JAVA产生对象的几种方式】

原文：http://gaojingsong.iteye.com/blog/2291821