Passing a scanner from static to non-static and return a float java [closed]

Question

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.

Closed 9 years ago.

I am working on a project where I need to pass a scanner from the static main method to a non-static method from a text file read by the scanner and have it return a float. So far I have:

public class Calculator extends Stack{
public static void main (String []args) {
    Scanner s = new Scanner(System.in);
    try
    {
        s = new Scanner(new FileInputStream("numbers.txt"));
        float z = calculate (s);

    } 

Then in my calculate method its declaration is just public float calculate(Scanner s){ I know similar questions have been asked many times but I am just not getting it. What is throwing me off is that there is no new object being created like nodes. Thank you.

Answer 1

You need to create an instance of the class. As the calculate() method is non-static, you need to invoke it on an instance of the class.

public class Calculator extends Stack{
public static void main (String []args) {
    Scanner s = new Scanner(System.in);
    Calculator c = new Calculator();
    try
    {
        s = new Scanner(new FileInputStream("numbers.txt"));
        float z = c.calculate (s);

    }