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        不好的做法 - 类定义 compareTo(...) 并使用 Object.equals()

        Bad practice - Class defines compareTo(...) and uses Object.equals()(不好的做法 - 类定义 compareTo(...) 并使用 Object.equals())
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                  本文介绍了不好的做法 - 类定义 compareTo(...) 并使用 Object.equals()的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  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.

                  这篇关于不好的做法 - 类定义 compareTo(...) 并使用 Object.equals()的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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