对象深度拷贝

利用序列化与反序列化对对象进行深度复制

public class Student implements Serializable {

	private String name;
	private String tel;
	private int age;
	
	//set and get.....
}

public class Teacher implements Serializable {

	private String name;
	private int age;
	private List<Student> stuList;

	//set and get....

}

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.List;

public class Test {

	
	public static void main(String[] args) {
		Student s1 = new Student();
		s1.setName("Wang");
		s1.setAge(25);
		s1.setTel("110");
		Student s2 = new Student();
		s2.setName("Li");
		s2.setAge(35);
		s2.setTel("119");
		
		
		Teacher t = new Teacher();
		t.setName("Zhang");
		t.setAge(50);
		List<Student> stuList = new ArrayList<Student>();
		stuList.add(s1);
		stuList.add(s2);
		t.setStuList(stuList);		
		System.out.println("t: "+t);
		System.out.println("s1: "+s1);
		System.out.println("s2: "+s2);
		System.out.println("after clone--------------");
		Teacher t2 = (Teacher) depthClone(t);
		System.out.println("t2: "+t2);
		System.out.println("t: "+t);
		
		Student s3 = t2.getStuList().get(0);
		Student s4 = t2.getStuList().get(1);
		System.out.println("s3: "+s3);
		System.out.println("s1: "+s1);
		System.out.println("s4: "+s4);
		System.out.println("s2: "+s2);
		
		System.out.println("after change--------------");
		t2.setAge(55);
		t2.setName("Zhao");
		
		System.out.println("t2 Name: "+t2.getName()+" t2 age"+t2.getAge());
		System.out.println("t Name: "+t.getName()+" t age"+t.getAge());

	}
	
	private static Object depthClone(Object srcObj){
		Object cloneObj = null;
		try {
			ByteArrayOutputStream out = new ByteArrayOutputStream();
			ObjectOutputStream oo = new ObjectOutputStream(out);
			oo.writeObject(srcObj);
			
			ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
			ObjectInputStream oi = new ObjectInputStream(in);
			cloneObj = oi.readObject();			
		} catch (IOException e) {
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		return cloneObj;
	}

}

输入结果：
t: jame.jsp.bean.Teacher@affc70
s1: jame.jsp.bean.Student@1e63e3d
s2: jame.jsp.bean.Student@1004901
after clone--------------
t2: jame.jsp.bean.Teacher@1f14ceb
t: jame.jsp.bean.Teacher@affc70
s3: jame.jsp.bean.Student@f0eed6
s1: jame.jsp.bean.Student@1e63e3d
s4: jame.jsp.bean.Student@1d05c81
s2: jame.jsp.bean.Student@1004901
after change--------------
t2 Name: Zhao t2 age55
t Name: Zhang t age50

*采用些方法做深度拷贝时，要求所有对象implements Serializable，否则报java.io.NotSerializableException异常。