标签：city Java Address 6.16 System DeepClone Person address out
- 浅克隆：复制对象的引用地址，导致克隆对象和原始对象共享引用类型字段的实际对象。
-
class Person implements Cloneable {
String name;
Address address;
public Person(String name, Address address) {
this.name = name;
this.address = address;
}
@Override
protected Object clone() throws CloneNotSupportedException {
return super.clone();
}
}
class Address {
String city;
public Address(String city) {
this.city = city;
}
}
public class Main {
public static void main(String[] args) throws CloneNotSupportedException {
Address address = new Address("New York");
Person person1 = new Person("Alice", address);
Person person2 = (Person) person1.clone();
System.out.println(person1.name); // Alice
System.out.println(person2.name); // Alice
System.out.println(person1.address.city); // New York
System.out.println(person2.address.city); // New York
person2.address.city = "Los Angeles";
System.out.println(person1.address.city); // Los Angeles (说明 address 引用被共享)
System.out.println(person2.address.city); // Los Angeles
}
}
- 深克隆：复制引用类型字段所指向的实际对象，使得克隆对象和原始对象完全独立。
-
class Person implements Cloneable {
String name;
Address address;
public Person(String name, Address address) {
this.name = name;
this.address = address;
}
@Override
protected Object clone() throws CloneNotSupportedException {
Person cloned = (Person) super.clone();
cloned.address = (Address) address.clone(); // 深拷贝 address
return cloned;
}
}
class Address implements Cloneable {
String city;
public Address(String city) {
this.city = city;
}
@Override
protected Object clone() throws CloneNotSupportedException {
return super.clone();
}
}
public class Main {
public static void main(String[] args) throws CloneNotSupportedException {
Address address = new Address("New York");
Person person1 = new Person("Alice", address);
Person person2 = (Person) person1.clone();
System.out.println(person1.name); // Alice
System.out.println(person2.name); // Alice
System.out.println(person1.address.city); // New York
System.out.println(person2.address.city); // New York
person2.address.city = "Los Angeles";
System.out.println(person1.address.city); // New York (说明 address 引用被独立复制)
System.out.println(person2.address.city); // Los Angeles
}
}
标签：city,
Java,
Address,
6.16,
System,
DeepClone,
Person,
address,
out
From： https://blog.csdn.net/k1076731326/article/details/139721263