Не работает

package com.javarush.task.pro.task10.task1010; import java.util.Objects; /* Два айфона */ public class Iphone { private String model; private String color; private int price; public Iphone(String model, String color, int price) { this.model = model; this.color = color; this.price = price; } @Override public boolean equals (Object obj) { if (this == obj) return true; if (obj == null) return false; if (!(obj instanceof Iphone)) return false; Iphone iphone = (Iphone) obj; if (this.model == null) return obj.model == null; if (this.color == null) return obj.color == null; if (this.price == null) return obj.price == null; if (this.model.equals(obj.model) && this.color.equals(obj.color) && this.price.equals(obj.price)) return true; } }