You are probably familiar with the concepts of identity and equality.

您可能熟悉相同性(identity)和相等性(equality)的概念。

youdao

There are two approaches to defining equality and hash value: identity-based, which is the default provided by Object, and state-based, which requires overriding both equals() and hashCode().

有两种方法来定义对象的相等性和散列值：基于标识，它是 Object提供的缺省方法；基于状态，它要求Overrideequals() 和hashCode() 。

youdao

There are two approaches to defining equality and hash value: identity-based, which is the default provided by Object, and state-based, which requires overriding both equals() and hashCode().

有两种方法来定义对象的相等性和散列值：基于标识，它是 Object提供的缺省方法；基于状态，它要求Overrideequals() 和hashCode() 。

youdao