如果你跟得上 Java 的发布节奏并且知道最新的 LTS 版本 Java 17，那么你可以了解一下支持不可变类的 Record 特性。

You typically override hashCode() when also overriding equals() in your classes, to ensure that objects instantiated from these classes work properly with all hash-based collections.

Obi Ezechukwu 's blog High-Octane Java recently featured the post Compact Equals , which compares an implementation of a Java class's overridden equals method in traditional form versus one ...