@Override
public boolean equals(Object o) {
if (o == null) return false;
if (this.getClass() != o.getClass()) return false;
Person p = null;
if (o instanceof Person) p = (Person) o;
if (age != p.age) return false;
if (!firstName.equals(p.firstName)) return false;
if (!lastName.equals(p.lastName)) return false;
return true;
}
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