java – 为什么程序员说“按引用传递”实际上是“按值传递引用？

> C中没有参考号召.
>按值传递并通过引用传递是不同的.它们不一样.

按值传递：被调用函数在堆栈中创建一组新变量,并将参数值复制到其中.

通过引用传递：不是将值传递给被调用的函数,而是传递对原始变量的引用/指针.

Why do programmers say that “pass by reference” is really “passing references by value?”

在传递对原始变量的引用/指针时,事实上对象/地址是按值传递的.因此,您可以说通过引用传递是按值传递引用,但这并不意味着通过引用传递是传递值的伪名称.两者之间的区别在this answer中得到了很好的解释.我正在复制摘录：

If I tell you the URL,I’m passing by reference. You can use that URL to see the same web page I can see. If that page is changed,we both see the changes. If you delete the URL,all you’re doing is destroying your reference to that page – you’re not deleting the actual page itself.

If I print out the page and give you the printout,I’m passing by value. Your page is a disconnected copy of the original. You won’t see any subsequent changes,and any changes that you make (e.g. scribbling on your printout) will not show up on the original page. If you destroy the printout,you have actually destroyed your copy of the object – but the original web page remains intact.