Валидатор пишет, что метод User.clon() возвращает не новый объект?!
public Object clon() throws CloneNotSupportedException {
User user = new User();
user.name = this.name;
user.age = this.age;
return user;
}
package com.javarush.task.task21.task2107;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Objects;
/*
Глубокое клонирование карты
*/
public class Solution implements Cloneable {
public Object clone() throws CloneNotSupportedException {
Solution solution = new Solution();
solution.users = new LinkedHashMap<>(this.users);
return solution;
}
public static void main(String[] args) {
Solution solution = new Solution();
solution.users.put("Hubert", new User(172, "Hubert"));
solution.users.put("Zapp", new User(41, "Zapp"));
Solution clone = null;
try {
clone = (Solution) solution.clone();
System.out.println(solution);
System.out.println(clone);
System.out.println(solution.users);
System.out.println(clone.users);
} catch (CloneNotSupportedException e) {
e.printStackTrace(System.err);
}
/*User user = new User(23, "vasia");
try {
User user1 = (User)user.clon();
System.out.println(user == user1);
}
catch (CloneNotSupportedException e) {
} */
}
protected Map<String, User> users = new LinkedHashMap();
public static class User implements Cloneable {
int age;
String name;
public User(int age, String name) {
this.age = age;
this.name = name;
}
public User() {}
public Object clon() throws CloneNotSupportedException {
User user = new User();
user.name = this.name;
user.age = this.age;
return user;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || ! (o instanceof Solution)) return false;
User user = (User) o;
return age == user.age && (name == user.name || (name != null && name.equals(user.name)));
}
@Override
public int hashCode() {
int result = age;
result += (name != null ? name.hashCode() : 0);
return result;
}
}
}
Очень помогает с имплементацией методов.