无法修复java找不到符号错误

Question

I'm working on a project and I can't figure out how to fix this error. I am calling for an integer from a different method with

public static void main(String [] args){
    int foo = 0;
    foo = method(foo);
}
public static int method(){
    int foo = (equation)
    return foo;
}

but I keep getting the error:

error: cannot find symbol
        foo = method(foo);
                     ^
  symbol:   variable foo
  location: class MainClass

I declared foo as an int in a separate method and I returned foo at the end of it. But when trying to call for it in the main method I got that error.

Answer 1

You can't say

int foo = method(foo);

because there is no value assigned to foo which might be passed to method . You could do something like,

int foo = 0; // <-- Initialize foo to 0
foo = method(foo); // <-- passes foo

When you declare your method, first (equation) isn't valid code. Second, you aren't declaring that it takes an int argument. Change method like

public static int method(int foo){
  int x = foo * foo; // <-- equation?
  return x;
}

Or,

int foo = method(); // if method takes no arguments.