问题描述
想知道列出的方法需要做什么
Wondering what needs to be done for listed method
public final int compareTo(final FieldDTO o) { return o.available.compareTo(this.available);
它在第 2 行抛出异常说明不好的做法 - 类定义 compareTo(...) 并使用 Object.equals() 16 天
field 定义 compareTo(FieldDTO) 并使用 Object.equals()
its throwing exception on line 2 stating
Bad practice - Class defines compareTo(...) and uses Object.equals() 16 days
field defines compareTo(FieldDTO) and uses Object.equals()
不知道我应该如何处理.提前致谢.
Not sure how should i handle this. Thanks in advance.
推荐答案
如果你定义 compareTo 你至少应该定义 equals
If you define compareTo you should at least define equals
boolean equals(it) { return compareTo(it) == 0; }
否则当你把你的对象放在 Maps 和 Sets 时你会遇到奇怪的问题.通常也定义 hashCode 是一种好习惯.
otherwise you will get strange problems when you put your object in Maps and Sets. It is generally good practice to also define hashCode.