2.3 equals 和 hashCode 的关系 核心契约：若两个对象通过 equals 判断相等，则它们的 hashCode 必须相等。 原因：哈希表（如 HashMap）使用 hashCode 定位桶，若 equals 相等的对象 hashCode 不同，可能被放入不同桶，导致无法正确查找。

Add a description, image, and links to the java-hashcode topic page so that developers can more easily learn about it ...

The equals and hashCode implementation of PathPatternRequestMatcher was altered in #17337 The current implementation of PathPatternRequestMatcher has a non-final field RequestMatcher method. A setter ...

In a major security lapse, the United States nuclear weapons agency, National Nuclear Security Administration , was breached ...

4. 解决方案 很明显出现这个问题的原因就是因为并发操作修改的status影响了hashcode计算结果，进而导致并发操作变得无效，因为id是全局唯一的，所以直接重写hashCode和equals方法，让Task对象的计算和比对都通过id进行： ...

Separate from the official feature list, JDK 25 also brings performance improvements to the class String, by allowing the String::hashCode function to take advantage of a compiler optimization ...