奇怪的Java变量声明

Question

I came across some code and saw a very weird way of declaring a variable

double var1 ();

Has anyone come across java code written in this manner? I am not sure what this actually does, the thing that confuses me and is new to me is the space between the variable name and "()".

Surrounding Code:

void setVar1 (double Var1);
double var1 ();

I actually think this maybe a method declaration actually instead of a variable declaration. Opinion?

Answer 1

The only way that would be valid is if it was a method declaration inside an interface. For example

interface What {
    double var1();
}

It's not a field.

Here is the official Java tutorial on interfaces.

the thing that confuses me and is new to me is the space between the variable name and "()".

Whitespace characters are delimiters between Java syntax elements. You can put as many such spaces as you want

interface What {
    double var1                                                 ();
}

or even

interface What {
    double var1  




                                  ();
}

Answer 2

当您在接口中进行方法声明时，可能会发生这种情况