Переопределение метода equals

import java.util.Date;
import java.util.Objects;
 
public class Solution {
    private int anInt;
    private String string;
    private double aDouble;
    private Date date;
    private Solution solution;
 
    public Solution(int anInt, String string, double aDouble, Date date, Solution solution) {
        this.anInt = anInt;
        this.string = string;
        this.aDouble = aDouble;
        this.date = date;
        this.solution = solution;
    }
 
    @Override
    public int hashCode(){
        int result = 17;
        result = 37 * result + anInt;
        result = 37 * result + (string == null ? 0 : string.hashCode());
        long longBits = (Double.doubleToLongBits(aDouble));
        result = 37 *  result + (int)(longBits - (longBits >>> 32));
        result = 37 * result + (date != null ? date.hashCode() : 0);
        result = 37 * result + (solution != null ? solution.hashCode() : 0);
        return result;
    }
 
    @Override
    public boolean equals(Object obj){
        if(this == obj) return true;
        if(this.getClass() != obj.getClass()) return false;
        Solution other = (Solution) obj;
        if(anInt != other.anInt) return false;
        if (!Objects.equals(string, other.string)) return false;
        if(aDouble != other.aDouble) return false;
        if(!Objects.equals(date, other.date)) return false;
        if(!Objects.equals(solution, other.solution)) return false;
        return true;
    }
 
    public static void main(String[] args) throws InterruptedException {
        Date date1 = new Date();
        Thread.sleep(200);
        Date date2 = new Date();
        date1.setTime(1000);
        date2.setTime(1000);
        Solution solution4 = new Solution(2,null, .2, date1, null);
        Solution solution3 = new Solution(2,null, .2, date1, null);
        Solution solution1 = new Solution(2,null, .2, null, solution3);
        Solution solution2 = new Solution(2,null, .2, null, null);
        System.out.println(solution1.equals(solution2));
//        System.out.println(solution1.hashCode() == solution2.hashCode());
    }
}

if (obj == null) return false;