Java的clone方法可以用于對象的復制，但是它有深拷貝和淺拷貝之分。

淺拷貝是指將原對象的引用地址復制給新對象，新對象所引用的依然是原對象的屬性和方法。示例代碼如下：

public class Person implements Cloneable {
private String name;
private int age;
private Listhobbies;
public Person(String name, int age, Listhobbies) {
this.name = name;
this.age = age;
this.hobbies = hobbies;
}
public ListgetHobbies() {
return hobbies;
}
public void setHobbies(Listhobbies) {
this.hobbies = hobbies;
}
public Person clone() throws CloneNotSupportedException {
return (Person) super.clone();
}
}
public class Main {
public static void main(String[] args) throws CloneNotSupportedException {
Person p1 = new Person("Tom", 20, Arrays.asList("reading", "running", "swimming"));
Person p2 = p1.clone();
System.out.println("p1:" + p1 + ", p2:" + p2);
System.out.println(p1.getHobbies() == p2.getHobbies());
}
}

輸出結果如下：

p1: Person@15db9742, p2: Person@6d06d69c
true

可以看出p1和p2的引用地址不同，但是它們的hobbies屬性引用地址相同。

深拷貝則是在拷貝對象時將其所有屬性都進行拷貝，即新對象和原對象互不影響。示例代碼如下：

public class Person implements Cloneable {
private String name;
private int age;
private Listhobbies;
public Person(String name, int age, Listhobbies) {
this.name = name;
this.age = age;
this.hobbies = hobbies;
}
public ListgetHobbies() {
return hobbies;
}
public void setHobbies(Listhobbies) {
this.hobbies = hobbies;
}
public Person clone() throws CloneNotSupportedException {
Person clone = (Person) super.clone();
clone.hobbies = new ArrayList<>(hobbies);
return clone;
}
}
public class Main {
public static void main(String[] args) throws CloneNotSupportedException {
Person p1 = new Person("Tom", 20, Arrays.asList("reading", "running", "swimming"));
Person p2 = p1.clone();
System.out.println("p1:" + p1 + ", p2:" + p2);
System.out.println(p1.getHobbies() == p2.getHobbies());
}
}

輸出結果如下：

p1: Person@15db9742, p2: Person@6d06d69c
false

可以看出p1和p2的hobbies屬性引用地址不同，即它們的引用關系已經斷開。