對于Java中對象的拷貝，有兩種方式：淺拷貝和深拷貝。

淺拷貝是指創建一個新對象，并將原來對象的所有屬性值復制到新對象中，如果屬性值為引用類型，則新對象和原來對象共享該引用類型對象。即修改新對象的引用類型屬性，會影響原對象。

public class ShallowCopyDemo {
public static void main(String[] args) throws CloneNotSupportedException {
Person person1 = new Person("Tom", 22, new Address("Beijing"));
Person person2 = (Person) person1.clone();    //淺拷貝
System.out.println("person1: " + person1);
System.out.println("person2: " + person2);
System.out.println(person1.getAddress() == person2.getAddress());    //true，共享Address對象
person2.getAddress().setCity("Shanghai");
System.out.println("person1: " + person1);
System.out.println("person2: " + person2);
}
}
class Person implements Cloneable {
private String name;
private int age;
private Address address;
//構造方法、get、set方法省略
@Override
protected Object clone() throws CloneNotSupportedException {
return super.clone();
}
}
class Address {
private String city;
//構造方法、get、set方法省略
}

深拷貝是指創建一個新對象，并將原來對象的所有屬性值復制到新對象中，對于屬性值為引用類型的屬性，則新對象會獨立創建該引用類型的對象。即修改新對象的引用類型屬性，不會影響原對象。

public class DeepCopyDemo {
public static void main(String[] args) throws Exception {
Person person1 = new Person("Tom", 22, new Address("Beijing"));
Person person2 = person1.deepCopy();    //深拷貝
System.out.println("person1: " + person1);
System.out.println("person2: " + person2);
System.out.println(person1.getAddress() == person2.getAddress());    //false，不共享Address對象
person2.getAddress().setCity("Shanghai");
System.out.println("person1: " + person1);
System.out.println("person2: " + person2);
}
}
class Person {
private String name;
private int age;
private Address address;
//構造方法、get、set方法省略
public Person deepCopy() throws Exception {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(this);    //序列化
ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
ObjectInputStream ois = new ObjectInputStream(bais);
return (Person) ois.readObject();    //反序列化
}
}
class Address implements Serializable {
private String city;
//構造方法、get、set方法省略
}