An immutable "variable" is declared with the keyword val (think value object).

一个不变的“变量”可以用val关键字来声明(想象一个值对象)。

youdao

An immutable "variable" is declared with the keyword val (think value object).

一个不变的“变量”可以用val关键字来声明(想象一个值对象)。

youdao