IBM中国研发中心面试题，如何用Java写一个程序达到对象深浅克隆的效果？不能用API

Question

IBM中国研发中心面试题，如何用Java写一个程序达到对象深浅克隆的效果？不能用API。来吧，大家发表意见，全分奉上。

Answer 1

[code="java"]
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

/**

• 深/浅克隆

• @author JohnGao
  /
  public class CloneTest
  {
  /*

  • 模拟对象深/浅克隆效果
  • @author JohnGao
  • @param T: 目标克隆对象
  • @throws Exception

  • @return T: 克隆对象
    /
    public static T clone(T t) throws Exception
    {
    / 实例化字节数组节点流 */
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    ObjectOutputStream objectOutputStream = new ObjectOutputStream(
    byteArrayOutputStream);

    /* 将目标克隆对象转换成数组 */
    objectOutputStream.writeObject(t);

    /* 返回克隆对象 */
    return (T) new ObjectInputStream(new ByteArrayInputStream(
    byteArrayOutputStream.toByteArray())).readObject();
    }
    }
    [/code]

[code="java"]
public int age;
public StringBuffer str = new StringBuffer();

@Test
public void test() throws Exception
{
    MyTest myTest1 = new MyTest();
    MyTest myTest2 = CloneTest.clone(myTest1);
    System.out.println("myTest1.hashcode: " + System.identityHashCode(myTest1));
    System.out.println("myTest2.hashcode: " + System.identityHashCode(myTest2));
    myTest2.age = 15;
    System.out.println("myTest1.age: " + myTest1.age);
    System.out.println("myTest2.age: " + myTest2.age);
    myTest1.str.append("++++");
    myTest2.str.append("----");
    System.out.println("myTest1.str: " + myTest1.str);
    System.out.println("myTest2.str: " + myTest2.str);
}

[/code]