问题描述
有人可以在下一行告诉我副作用的含义吗？
Could someone tell me the meaning of "side effect" in the following line?
推荐答案
副作用是除了计算和返回值之外的任何方法。实例或类字段值的任何更改都是副作用，就像在屏幕上绘制内容，写入文件或网络连接一样。
A side effect is anything a method does besides computing and returning a value. Any change of instance or class field values is a side effect, as is drawing something on the screen, writing to a file or a network connection.
严格来说，函数被定义为没有副作用 - 这就是Java使用方法一词的原因。没有返回值的真正函数将毫无意义。
Strictly speaking, a "function" is defined as not having side effects - which is why Java uses the word "method" instead. A real function with no return value would be pointless.
显然，没有返回值的方法必须具有某种副作用，证明其存在是正确的。设置方法就是一个例子 - 副作用是改变对象的内部状态。
Obviously, a method that does not have a return value must have some sort of side effect that justifies its existence. Set methods are an example - the side effect is changing the object's internal state.
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