It is reflexive: for any non-null reference value x, x.equals (x) should return true.

具有反射性：对于任何非空的参考值x, x.e quals (x)应该返回真值。

youdao

It is transitive: for any non-null reference values x, y, and z, if x.equals (y) returns true and y.equals (z) returns true, then x.equals (z) should return true.

具有传递性：对于任何非空的参考值x、y和z，如果x.e quals (y)返回真值并且y.e quals (z)也返回真值，那么x.e quals (z)也应该返回真值。

youdao

You might wonder about the String class given the issue of out-of-order writes and a reference becoming non-null prior to the constructor executing. Consider the following code.

鉴于无序写入和引用在构造函数执行前变成非null的问题，您可能会考虑string类。

youdao