我的HashSet包含(有意义的等价)重复!

Question

我已经覆盖了Person类中的hashCode()和equals()方法,这样两个具有相同名称(一个String)的Person对象将被视为相等,但我的set仍然包含两个具有相同名称的Persons.

这是我的Person类的代码:

public boolean equals(Person aPerson) {
    Person p = (Person) aPerson;
    //Since name is a String, we can just use
    //the overridden equals() method to ask
    //one name if it's equal to the other
    //person's name.
    return getName().equals(p.getName());
}

public int hashCode() {
    //Strings also have an overridden hashCode() method
    //so we can just return the result of calling hashCode()
    //on the name (instead of the object!)
    return name.hashCode();
}

Answer 1

您的equals方法不会覆盖,因为它需要一个参数. Object.equals(object)Person

要避免此问题,请始终@Override在覆盖方法时添加注释.
这样,如果参数设置错误,您将收到错误消息.