Помогите, плз, что не так делаю-в упор не вижу. СПС
package com.javarush.task.task21.task2104;
import java.util.HashSet;
import java.util.Set;
/*
Equals and HashCode
*/
public class Solution {
private final String first, last;
public Solution(String first, String last) {
this.first = first;
this.last = last;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
if(!(o instanceof Solution)) return false;
Solution solution = (Solution) o;
/*if (first != null ? !first.equals(solution.first) : solution.first != null) return false;
return last != null ? last.equals(solution.last) : solution.last == null;*/
boolean result=false;
if(first!=null&&first.equals(solution.first)){result=true;}
if (last != null && last.equals(solution.last)) {result=true; }
return result;
}
public int hashCode() {
/*int result = first != null ? first.hashCode() : 0;
result = 31 * result + (last != null ? last.hashCode() : 0);
return result;*/
return 31*(first==null?0:first.hashCode())+(last==null?0:last.hashCode());
}
public static void main(String[] args) {
Set<Solution> s = new HashSet<>();
s.add(new Solution("Donald", "Duck"));
System.out.println(s.contains(new Solution("Donald", "Duck")));
}
}