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代码

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;/**
 * @author wangyong
 *
 */
public class FormTest {public static Object objectCopy(Object sourceObj) //throws CloneNotSupportedException
    {
                
        //实现深克隆(即深复制)
        try
        {
            //将对象写到流里
            ByteArrayOutputStream bo=new ByteArrayOutputStream();
             ObjectOutputStream oo=new ObjectOutputStream(bo);
             oo.writeObject(sourceObj);//源对象
             //从流里读出来
             ByteArrayInputStream bi=new ByteArrayInputStream(bo.toByteArray());
             ObjectInputStream oi=new ObjectInputStream(bi);
             return(oi.readObject());//目标对象
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
            return null;
        }

    }

/**
     * @param args
     */
    public static void main(String[] args) {
        // TODO 自动生成方法存根
        
        
        try
        {
            B b1 = new B();
            b1.sb="b1";
            B b2 = new B();
            b2.sb="b2";
            A a1 = new A(b1);
            A a2 = new A(b2);
            
            a1.s="wy";
            a1.o="obj a1";
            a2=(A)a1.clone();//或 objectCopy(a1);
            //a2.b.sb="456";
            a2.s="a2";
            a2.b.sb="new b2";
            a2.o="obj a2";
            String ss = a2.s;
            
            //实现深复制之后, a1 中的对象 b 不会受到 a2 的重新赋值而改变;

            
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
            ex.getMessage();
        }
        //说明:要序列化的类需要实现 Serializable 接口;
         //要克隆的类需要实现 Cloneable 接口;
        
    }

}

class A implements Cloneable,Serializable
{
    public    String s = null;
    public Object o = null;
    public B b=null;
        
    A(B bb)
    {
        b = new B();
        b.sb=bb.sb;
    }public Object clone() //throws CloneNotSupportedException
    {        
        try
        {
            /*//浅克隆(即浅复制)
            A a = (A) super.clone();            
            return a;*/
            
            //实现深克隆(即深复制)
            //将对象写到流里
            ByteArrayOutputStream bo=new ByteArrayOutputStream();
             ObjectOutputStream oo=new ObjectOutputStream(bo);
             oo.writeObject(this);//序列化当前类
             //从流里读出来
             ByteArrayInputStream bi=new ByteArrayInputStream(bo.toByteArray());
             ObjectInputStream oi=new ObjectInputStream(bi);
             return(oi.readObject());
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
            return null;
        }

    }

}

class B implements Serializable
{
    String sb = null;
}