Java中的形式参数是什么? [英] What is a formal parameter, in Java?
问题描述
我正在研究java遗留代码,我遇到了一个代表正式参数的类,但我不知道为什么会这样。我读到 C ++形式参数的,但它让我感到困惑,因为C ++是一样的作为参数(我对这个肯定有疑问)并且在我的遗留代码中它是一个类,只有一个私有的int成员存储一个数字(带有他们的set& get方法)但老实说,我没有找到的的为什么强>该声明的。
I'm currently working on java legacy code and I encounter with a class that represent a formal parameter but I don't know why is that. I read about C++ Formal Parameters, but it confused me because in C++ it is the same as the argument (I'm in doubt about this affirmation) and in my legacy code it is a class, that has only a private int member that store a number (with their set & get methods) but honestly, I didn't find the why of that declaration.
推荐答案
在Java和C ++中的形式参数中指定方法的签名:
In Java and in C++ the formal parameter is specified in the signature of the method:
public void callIt(String a)
callIt
有一个正式参数是 String
。在运行时我们讨论实际参数(或参数),:
callIt
has a single formal parameter that is a String
. At run-time we talk about actual parameters (or arguments), the :
callIt("Hello, World");
Hello,World String
是一个实际参数字符串a
是一个形式参数。
"Hello, World" String
is an actual parameter, String a
is a formal parameter.
来自维基百科条目参数:
术语参数(有时称为形式参数)通常用于引用函数定义中的变量,
The term parameter (sometimes called formal parameter) is often used to refer to the variable as found in the function definition,
和:
参数(有时称为实际参数)是指传递的实际输入。
argument (sometimes called actual parameter) refers to the actual input passed.
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